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Journal articles on the topic 'Carbonyl compounds – Spectra'

Author: Grafiati

Published: 4 June 2021

Last updated: 10 February 2022

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1

Coleman, W. M., and Bert M. Gordon. "Examinations of the Matrix Isolation Fourier Transform Infrared Spectra of Organic Compounds. Part V." Applied Spectroscopy 41, no. 8 (1987): 1431–38. http://dx.doi.org/10.1366/0003702874447284.

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MI/FT-IR spectral data have been collected on selected types of organic compounds containing the carbonyl group. By the varying of the ratio of the matrix gas to the compound ( M/E) as well as the matrix gas (Ar vs. Xe), the observed splitting of the carbonyl absorption band was attributed to both conformer isolation and aggregation in the matrix. The splitting of the carbonyl group of methyl acetate was attributed to aggregation, while conformer isolation was found to exist for phenyl acetate and trimethylacetaldehyde. The magnitude of the splittings found in this study, 3–30 cm−1, is within

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2

Lin, Zhong-Ping, and Walter A. Aue. "Gas-phase luminescence of aromatic carbonyl compounds in excited nitrogen at atmospheric pressure." Canadian Journal of Chemistry 78, no. 1 (2000): 95–117. http://dx.doi.org/10.1139/v99-203.

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Certain types of aroyl compounds such as benzaldehyde, acetophenone, benzophenone, and anthraquinone produce intense gas-phase luminescence in excited nitrogen at atmospheric pressure. This luminescence was measured in pressure ranges of 1.001.67 atm and temperature ranges of 343473 K. A novel, radioactively (Ni-63) stimulated, high-voltage( [Formula: see text]1750 V/mm), low-current ( [Formula: see text]35 nA) discharge in high-purity nitrogen was used for gas chromatographic detection and spectral excitation. The gas-phase luminescence spectra of about sixty aroyl compounds - introduced as

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3

Coleman, W. M., and Bert M. Gordon. "Examination of the Matrix Isolation Fourier Transform Infrared Spectra of Organic Compounds: Part III." Applied Spectroscopy 41, no. 7 (1987): 1163–69. http://dx.doi.org/10.1366/0003702874447671.

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Matrix-isolated (MI) Fourier transform infrared spectra (FT-IR) have been collected on a series of esters and ketones. The values for the carbonyl absorption are intermediate between the values for vapor-phase (VP) and solid-state (SS) phases. The spectra reveal a splitting or broadening of the carbonyl absorption in the majority of cases for both compound types. The splitting, on the order of 5 to 10 cm−1, does not appear to be a function of concentration at ≤20 ng on the cryogenic disk. The splitting is also not unequivocally due to steric hindrance about the carbonyl group. Compounds with l

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4

Nyquist, Richard A. "Factors Affecting Infrared Group Frequencies: Carbonyl Stretching Absorption Bands." Applied Spectroscopy 40, no. 3 (1986): 336–39. http://dx.doi.org/10.1366/0003702864509105.

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The data presented show that infrared group frequencies are only applicable for specific spectra structure identification when the infrared spectrum of the unknown material is recorded in the same manner as that used to record the infrared spectra used to build the IR group-frequency data base. IR spectra recorded of compounds in different phases such as the liquid, solution, and vapor phase are useful in helping one to determine whether a compound exists in more than one rotational molecular configuration such as rotation of a CHCl2 group about a C-C=O single bond in compounds of form CHCl2-C

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5

Coleman, W. M., and Bert M. Gordon. "Examination of the Matrix Isolation Fourier Transform Infrared Spectra of Organic Compounds: Part VI." Applied Spectroscopy 42, no. 1 (1988): 101–8. http://dx.doi.org/10.1366/0003702884428545.

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Matrix isolation Fourier transform spectral evidence is presented that documents the isolation of rotational isomers in an argon matrix. The spectral evidence is based on the presence of split carbonyl absorption bands in the spectra of selected derivatives of methyl acetate which do not vary in intensity with changes in the matrix-to-eluate ratios. The results compare very favorably with FT-IR data on the identical compounds obtained in the vapor phase. The low temperature of the matrix isolation experiment (10 K) allows for the observance of rotational isomers not seen at the high temperatur

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6

Coleman, W. M., and Bert M. Gordon. "Examination of the Matrix Isolation Fourier Transform Infrared Spectra of Organic Compounds: Part II." Applied Spectroscopy 41, no. 7 (1987): 1159–62. http://dx.doi.org/10.1366/0003702874447446.

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Matrix-isolated (MI) Fourier transform infrared spectra have been collected on a series of aliphatic ketones. The values for the carbonyl absorptions maxima are intermediate between vapor-phase (VP) and solid-state solution (SS) phases. The data reveal a stereochemical influence on the position of the ketone carbonyl absorption when the carbons that are in the alpha position with respect to the carbonyl group contain alkyl snbstituents vs. protons. Steric bulk causes the frequency of the absorption to decrease. The position of the ketone carbonyl absorption was also shown to decrease as the ca

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7

Kohls, Emilija, and Matthias Stein. "VIBRATIONAL SCALING FACTORS FOR Rh(I) CARBONYL COMPOUNDS IN HOMOGENEOUS CATALYSIS." Contributions, Section of Natural, Mathematical and Biotechnical Sciences 38, no. 1 (2017): 43. http://dx.doi.org/10.20903/csnmbs.masa.2017.38.1.100.

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Metal carbonyl complexes are an important family of catalysts in homogeneous industrial processes. Their characteristic vibrational frequencies allow in situ tracking of catalytic progress. Structural assignment of intermedi-ates is often hampered by the lack of appropriate reference compounds. The calculation of carbonyl vibrational fre-quencies from first principles provides an alternative tool to identify such reactive intermediates. Scaling factors for computed vibrational carbonyl stretching frequencies were derived from a training set of 45 Rh-carbonyl complexes using the BP86 and B3LYP

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8

Yue, Wang, Liu Ju-Zheng, Jiang Shi-Mei, and Liang Ying-Qiu. "Spectra Studies of Titanium and Vanadium-Pentadienyl-Carbonyl Compounds." Acta Physico-Chimica Sinica 10, no. 04 (1994): 319–23. http://dx.doi.org/10.3866/pku.whxb19940407.

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9

Zaki, Dr Remon M., Prof Adel M. Kamal El-Dean, Dr Nermin A. Marzouk, Prof Jehan A. Micky, and Mrs Rasha H. Ahmed. "A FACILE SYNTHESIS AND REACTIONS OF AMINO SELENOLO[2,3-b]PYRIDINE CARBOXYLATE." JOURNAL OF ADVANCES IN CHEMISTRY 12, no. 1 (2015): 3910–18. http://dx.doi.org/10.24297/jac.v12i1.845.

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Incorporating selenium metal bonded to the pyridine nucleus was achieved by the reaction of selenium metal with 2-chloropyridine carbonitrile 1 in the presence of sodium borohydride as reducing agent. The resulting non isolated selanyl sodium salt was subjected to react with various α-halogenated carbonyl compounds to afford the selenyl pyridine derivatives 3a-f which compounds 3a-d underwent Thorpe-Ziegler cyclization to give 1-amino-2-substitutedselenolo[2,3-b]pyridine compounds 4a-d, while the other compounds 3e,f failed to be cyclized. Basic hydrolysis of amino selenolo[2,3-b]pyridine carb

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10

Bratu, I., F. Veiga, C. Fernandes, A. Hernanz та J. M. Gavira. "Infrared spectroscopic study of triacetyl‒β‒cyclodextrin and its inclusion complex with nicardipine". Spectroscopy 18, № 3 (2004): 459–67. http://dx.doi.org/10.1155/2004/727869.

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Infrared spectra of inclusion compounds of triacetyl‒β‒cyclodextrin with nicardipine hydrochloride were compared and analysed with those corresponding to their physical mixture and the pure compounds, respectively. Different O–H stretching vibrations, assigned to water molecules, were located in the Fourier Transform Infrared (FT IR) spectra of triacetyl‒β‒cyclodextrin, and its inclusion complex with nicardipine obtained by spray‒drying (SD) method. Water molecules involved in various hydrogen bonds environments change their status during complexation process. Evidences are observed of the for

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11

Coleman, W. M., and Bert M. Gordon. "Examination of the Matrix Isolation Fourier Transform Infrared Spectra of Organic Compounds: Part IV." Applied Spectroscopy 41, no. 7 (1987): 1169–72. http://dx.doi.org/10.1366/0003702874447644.

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Matrix-isolated (MI) Fourier transform infrared spectra (FT-IR) have been collected on a series of aldehydes and acids. The values for the carbonyl absorption are intermediate between the higher values for vapor-phase (VP) and lower values for solid-state (SS) phases. Substituent effects on aromatic rings induce shifts in carbonyl absorptions in the same manner as found in VP and SS studies. The magnitude of the shifts is approximately the same for all three phases. The spectra reveal a splitting or broadening of the carbonyl absorption for both aldehydes and acids. The size of the molecule af

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12

Zwiener, C., T. Glauner, and F. H. Frimmel. "LC-ESI/MS/MS analysis with derivatization applied to polar disinfection by-products in water treatment." Water Supply 3, no. 1-2 (2003): 321–28. http://dx.doi.org/10.2166/ws.2003.0120.

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Chlorination and ozonation experiments under conditions close to drinking water treatment were carried out with two different tap waters with low DOC content and water from a bog lake with high natural organic matter content. THM formation was low and in the range of 10 μg/L. Derivatization with dinitrophenylhydrazine and HPLC/tandem mass spectrometry were applied to measure carbonyl DBPs by precursor ion scans at m/z 163 for aldehydes and at m/z 182 for dicarbonyls. Formaldehyde, acetaldehyde, glyoxal, and methylglyoxal were formed by chlorination and ozonation. Ozonation produced the highest

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13

El-Abadelah, Mustafa M., Musa Z. Nazer, Salim S. Sabri, Salim M. Khalil, Wolfgang Voelter та Marcela Geiger. "Synthesis and Chiroptical Properties of Some N-(2-Chloro-7-cyclopropyl-4,7-dihydro-4-oxo-thieno[2,3-b]pyridine-5-carbonyl) L-α-Amino Esters". Zeitschrift für Naturforschung B 52, № 3 (1997): 419–26. http://dx.doi.org/10.1515/znb-1997-0321.

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Abstract A series of N-(2-chloro-7-cyclopropyl-4,7-dihydro-4-oxothieno[2,3-b]pyridine-5-carbonyl)-L-α-amino esters (5 ) have been prepared via the respective thieno[2,3-b]pyridinyl-5-carbonyl chloride (4). The CD spectra of the L-aliphatic (5a -d ) and L-aromatic (5e-g) a-amino acid derivatives display, in organic solvents, sign inversion of the measured Cotton effect (CE) bands. This chiroptical behaviour is probably associated with differences in conformational isomerism of either set. MS and NMR spectral data of the title compounds are presented.

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14

Xuqing, Liu, Li Yayun, Liu Chao, et al. "Identification of residual non-biodegradable organic compounds in wastewater effluent after two-stage biochemical treatment." Open Life Sciences 11, no. 1 (2016): 396–401. http://dx.doi.org/10.1515/biol-2016-0053.

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AbstractThe main non-biodegradable compounds (soluble microbial product – SMP) of wastewater from the Maotai aromatic factories, located in the Chishui river region, were analyzed by UV spectroscopy, and by solid-phase extraction followed by gas chromatography coupled to mass spectrometry, after a two-stage biochemical treatment. The UV-Vis spectra revealed that the wastewater contained two double-bonds in conjugated systems (conjugated diene or α, β- unsaturated ketone, etc.) and simple non-conjugated chromophores containing n electrons from carbonyl groups or the like. The residual organic n

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15

Dahn, Hans, and My-Ngoc Ung-Truong. "17O-NMR Spectra of Mesoionic Compounds: The polarized carbonyl group." Helvetica Chimica Acta 71, no. 1 (1988): 241–48. http://dx.doi.org/10.1002/hlca.19880710126.

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16

Mizyuk, Volodymyr, and Volodymyr Shibanov. "Peculiarities of 13C NMR Spectra of Benzoylformic Acid and its Esters. 1. Benzoyl Fragment." Chemistry & Chemical Technology 3, no. 2 (2009): 83–90. http://dx.doi.org/10.23939/chcht03.02.083.

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Peculiarities of 13C NMR spectra of benzoyl fragment of benzoylformic acid and its esters have been investigated and characteristic values of a chemical shift of all five types of fragment atom have been examined. Similar parameters of other benzoyl-containing compounds by general formula Bz–X (X = H, NR2, OR, SR, Cl, Br), as well as those of compounds Bz–C (L)(M)(N) have been compared. It has been shown that spectral peculiarities of a benzoylformates phenyl fragment are defined by the carbonyl, not by the carbalkoxyl group.

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17

Ruduss, Armands, Kaspars Traskovskis, Raitis Grzibovskis, and Valdis Kokars. "Synthesis and Photoelectrical Properties of 3-(Diphenylamino)Carbazolyl-Functionalized DMABI Derivatives." Key Engineering Materials 800 (April 2019): 280–85. http://dx.doi.org/10.4028/www.scientific.net/kem.800.280.

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A modular approach was used in the synthesis of the 3-(diphenylamino)carbazolyl- functionalized 2-(4-(dimethylamino)benzylidene)-1H-indene-1,3(2H)-dione (DMABI) derivatives. For this purpose, carboxyl functional group was introduced into the framework of DMABI molecule. Additionally, a regioselective method for substitution of carbonyl group of DMABI with dicyanomethylene group was investigated and verified using the heteronuclear multiple bond correlation NMR spectra. Steglich esterification method was used to connect the 3‑(diphenylamino)carbazolyl moiety via an unconjugated spacer. The UV-V

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18

MURAMATSU, YASUJI, KENTARO KURAMOTO, ERIC M. GULLIKSON, and RUPERT C. C. PERERA. "SOFT X-RAY ABSORPTION SPECTRA IN THE 0 K REGION OF MICROPOROUS CARBON AND SOME REFERENCE AROMATIC COMPOUNDS." Surface Review and Letters 09, no. 01 (2002): 267–70. http://dx.doi.org/10.1142/s0218625x02002178.

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To analyze the oxidation states of the graphitic surface of microporous carbon, soft X-ray absorption spectra in the 0 K region have been obtained for microporous carbon and various aromatic compounds. The aromatic molecules studied are substituted with one or more of the following oxygenated functional groups: hydroxy (–OH), carboxy (–COOH), carbonyl (>C=O), formyl (–CH=O), and ether (–O–). From comparison of the soft X-ray absorption spectra of microporous carbon and of reference aromatic compounds, the most probable chemical bonding states of oxygen in microporous carbon are found to be

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19

Md Salim, Rafidah, Jahimin Asik, and Mohd Sani Sarjadi. "Chemical functional groups of extractives, cellulose and lignin extracted from native Leucaena leucocephala bark." Wood Science and Technology 55, no. 2 (2021): 295–313. http://dx.doi.org/10.1007/s00226-020-01258-2.

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Abstract Bark from trees is considered a worthless raw material. However, this resource could be economically beneficial if utilized efficiently due to its rich chemical compounds. In this study, an ethanol toluene-soluble extractive, alpha-cellulose and lignin obtained from Leucaena leucocephala bark were characterized to determine their chemical functional groups. Based on FTIR spectral analysis, the results indicated that the bands of the functional groups of the extractive from the original bark remain unchanged; however, the absorbance intensity was found to be weaker in the group frequen

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20

Coleman, W. M., and Bert M. Gordon. "Examinations of the Matrix Isolation Fourier Transform Infrared Spectra of Organic Compounds: Part XI." Applied Spectroscopy 42, no. 6 (1988): 1049–56. http://dx.doi.org/10.1366/0003702884430452.

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Matrix isolation Fourier transform infrared information has been presented on a series of aliphatic amines, anilines, and amides. The absorptions associated with NH stretches are found at essentially the same energies in both the vapor phase (VP) and matrix isolation (MI) phase. Both the VP and MI values are found at higher energy than the solid state (SS) phase. The similarity of the values for the MI and VP phases is a departure from results found previously for other types of organic compounds. The carbonyl absorptions for the amides (MI) were found to be intermediate between the VP (high)

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21

Coleman, W. M., and Bert M. Gordon. "Examinations of the Matrix Isolation Infrared Spectra of Organic Compounds: PART XIII." Applied Spectroscopy 43, no. 2 (1989): 305–10. http://dx.doi.org/10.1366/0003702894203246.

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Matrix isolation Fourier transform infrared (MI/FT-IR) spectra have been collected on a series of internal alkenes, a series of hydroxy-substituted ketones, and a series of hydroxy-substituted esters. Assignments of double bond position and geometry are possible in the alkenes, due to the resolution of absorption bands of very similar energies. The location of the absorption bands for the alkenes was found to be very similar to the values found for the vapor-phase and condensed-phase spectra. Multiple carbonyl absorptions have been found in the MI/FT-IR spectra of the hydroxy ketones and hydro

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22

Halket, John M., and Vladimir G. Zaikin. "Derivatization in Mass Spectrometry—5. Specific Derivatization of Monofunctional Compounds." European Journal of Mass Spectrometry 11, no. 1 (2005): 127–60. http://dx.doi.org/10.1255/ejms.712.

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The present paper is complementary to the foregoing reviews and describes some additional methods of the derivatization of particular functional groups mainly to enhance the structural information content of electron ionization and chemical ionization mass spectra. Derivatization approaches for the modification of unsaturated compounds, alcoholic, carboxylic, carbonyl, amine and other functional groups, are discussed. Derivatization for separation and quantitative determination of chiral enantiomeric compounds is also considered. Preliminary chemical and physical–chemical degradation for struc

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23

Coleman, W. M., and Bert M. Gordon. "Examination of the Matrix Isolation Fourier Transform Infrared Spectra of Organic Compounds, Part I." Applied Spectroscopy 41, no. 5 (1987): 886–89. http://dx.doi.org/10.1366/0003702874448346.

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Data are presented that describe the IR spectra of organic compounds obtained under matrix isolation conditions. Among the types of compounds examined are amides, lactones, lactams, esters, acids, alcohols, and phenols. Trends, as a function of structure, established in vapor-phase IR are shown to exist under MI conditions. The frequency (cm−1) of the stretching absorption for hydroxyl groups and carbonyl groups associated with the types of compounds listed above under MI conditions is shown to be intermediate between the vapor-phase position (highest energy) and the solid-solution position (l

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24

Coleman, W. M., and Bert M. Gordon. "Examination of the Matrix Isolation Fourier Transform Infrared Spectra of Organic Compounds: Part VII." Applied Spectroscopy 42, no. 1 (1988): 108–13. http://dx.doi.org/10.1366/0003702884428662.

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A series of lactones and lactams have been examined by matrix isolation Fourier transform infrared spectrometry. The values for the carbonyl absorption bands fall between those reported for the same compounds in the vapor phase and solid state. Multiple absorption bands are found in the region of carbonyl absorption for compounds examined under the matrix isolation phase. Ring strain has a dramatic effect on simplifying the complexity of the spectra. Little or no aggregation effects are observed for either the lactones or lactams under accepted operating parameters. The effects of substituents

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25

Chen, Hong, Zi-Chao Tang, Rong-Bin Huang, and Lan-Sun Zheng. "Photodissociation Mass Spectrometry of Trinuclear Carbonyl Clusters M3(CO)12 (M = Fe, Ru, Os)." European Journal of Mass Spectrometry 6, no. 1 (2000): 19–22. http://dx.doi.org/10.1255/ejms.301.

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Photodissociation of trinuclear carbonyl cluster compounds of Fe, Ru and Os was studied by recording the mass spectra produced from laser ablation of the cluster compounds. Under the experimental conditions, dissociation of the cluster compounds is very extensive, but the dissociation pathway of the osmium cluster is different from those of the iron and ruthenium clusters. The iron and ruthenium clusters not only lost their carbonyl ligands, but their cluster cores were also fragmented. As the osmium cluster dissociated, it ejected three pairs of oxygen atoms, in sequence, before losing the ca

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26

Balfour, Walter J., Scott G. Fougere, Dieter Klapstein, and Werner M. Nau. "The infrared and Raman spectra of methoxycarbonyl and thiomethoxycarbonyl isocyanates." Canadian Journal of Chemistry 71, no. 10 (1993): 1627–31. http://dx.doi.org/10.1139/v93-203.

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The gas phase infrared and liquid phase Raman spectra of the title compounds have been recorded and vibrational analyses performed. The spectra show evidence for the presence in both the liquid and vapour phases of two rotational isomers: cisoid-Z and transoid-Z with reference to orientation of isocyanato and methyl groups relative to the carbonyl group.

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27

Allegretti, Patricia E., M. de las Mercedes Schiavoni, Celia Guzmán, Agustín Ponzinibbio, and Jorge J. P. Furlong. "Mass Spectral Study of the Occurrence of Tautomeric Forms of Thiohydantoins." European Journal of Mass Spectrometry 13, no. 4 (2007): 291–306. http://dx.doi.org/10.1255/ejms.885.

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Mass spectrometry is used to evaluate the occurrence of thio-enol structures among the several possible tautomers of thiohydantoins and dithiohydantoins. Mass spectra of differently-substituted thiohydantoins are examined looking for common mass spectral behaviors to be predicted. Ion fragmentations from specific tautomers allow the most stable thio-enol structure for both type of compounds. The mass spectrum of the alkylation product of 5,5-dimethyldithiohydantoin and the nuclear magnetic resonance spectra of the alkylation products of both 2-thiohydantoin and dithiohydantoin support the fact

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28

Coleman, W. M., and Bert M. Gordon. "Examinations of the Matrix Isolation Fourier Transform Infrared Spectra of Organic Compounds: Part XV." Applied Spectroscopy 43, no. 6 (1989): 1004–8. http://dx.doi.org/10.1366/0003702894204047.

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Matrix isolation Fourier transform infrared spectra (MI/FT-IR) of a series of essential oil components have been described. Clear, well-defined differences were detected in the MI/FT-IR spectra of compounds having minor differences in their structure. A library search routine was found to correctly identify components of interest when visual differences were not clearly evident. The presence of discrete conformers in the argon matrix resulted in the presence of split absorptions in the carbonyl band for selected compounds.

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29

Ochs, Soraya de M., Maíra Fasciotti, and Annibal D. Pereira Netto. "Analysis of 31 Hydrazones of Carbonyl Compounds by RRLC-UV and RRLC-MS(/MS): A Comparison of Methods." Journal of Spectroscopy 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/890836.

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Aldehydes and ketones are volatile organic compounds (VOC) emitted into the atmosphere by a large number of natural and anthropogenic sources. Carbonyl compounds (CC) are atmospheric pollutants with known damaging effects for the human’s health. In this work, the separation of 31 carbonyl compounds (CC) in their 2,4-dinitrophenylhydrazones form was optimized by rapid resolution liquid chromatography in 9 minutes and simultaneously detected by ultraviolet and mass spectrometry with an APCI(−) as ionization source. The mass spectra of hydrazones presented the [M-H]−ions as base peak, but the MS/

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30

Hearn, Michael J., Suzanne A. Lebold, Anvita Sinha, and Karen Sy. "Preparation and absorption spectra of arylhydrazones from .alpha.,.beta.-unsaturated carbonyl compounds." Journal of Organic Chemistry 54, no. 17 (1989): 4188–93. http://dx.doi.org/10.1021/jo00278a036.

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31

Aime, Silvio, Mauro Botta, Geoffrey E. Hawkes, Keith D. Sales, and Lu-Yun Lian. "Solid state 13C CP-MAS NMR spectra of iron (alkyne) carbonyl compounds." Journal of Organometallic Chemistry 368, no. 3 (1989): 331–38. http://dx.doi.org/10.1016/0022-328x(89)85411-7.

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32

Andrieu, Claude G., and Henri Lumbroso. "A Spectroscopic Study of Pivalophenone, 2-Pivaloylfuran, 2-Pivaloylthiophen and 2-Pivaloylselenophen, and their Sulphur Analogues." Zeitschrift für Naturforschung A 40, no. 12 (1985): 1329–37. http://dx.doi.org/10.1515/zna-1985-1223.

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Infrared, ultraviolet, 1H and 13C nuclear magnetic resonance spectra were recorded for the title compounds. The infrared carbonyl-band frequencies and intensities, and the H5 chemical shifts, of planar acetophenone, 2-acetylfuran, 2-acetylthiophen and 2-acetylselenophen indicate the order Phenyl < 2-Furyl < 2-Thienyl < 2-Selenyl for Aryl-carbonyl conjugation. Ultraviolet K-band absorption coefficients and carbon-13 chemical shifts provide an estimate of the twisting angle in the pivaloyl derivatives.

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33

Kuznetsov, Dmitry N., Konstantin I. Kobrakov, and Sergey S. Bobylev. "SPECTRAL-LUMINESCENT PROPERTIES OF SOME NEW DIHYDROXY-2H-1-BENZOPYRAN-2-ONES SYNTHESIZED BASED ON 2,4,6-TRIHYDROXYTOLUENE." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 63, no. 9 (2020): 37–42. http://dx.doi.org/10.6060/ivkkt.20206309.6226.

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2,4,6-trihydroxytoluene (methylphloroglucinol) is a promising reagent in organic synthesis, after development out getting it from 2,4,6-trinitrotoluene. We previously synthesized of derivatives of 5,7-dihydroxy-2H-1-benzopyran-2-ones by the interaction of 2,4,6-trihydroxytoluene and 2,4,6 -trihydroxy-3-methylbenzoic acid with polyfunctional carbonyl compounds. The first time, a detailed analysis of the electronic absorption and fluorescence spectra of derivatives of 5,7-dihydroxy-2H-1-benzopyran-2-ones is carried out. In the electronic absorption spectra of the studied compounds, the absorptio

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34

Kim, Doory, Key Young Yang, Hyung Min Kim, et al. "Site-dependent effects of methylation on the electronic spectra of jet-cooled methylated xanthine compounds." Physical Chemistry Chemical Physics 19, no. 33 (2017): 22375–84. http://dx.doi.org/10.1039/c7cp03380j.

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The torsional barrier of methylated xanthine compounds is affected by a methyl-adjacent carbonyl or methyl group in the ground state, whereas it is governed in the excited state by the hyperconjugation interaction in the LUMO.

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35

Kisch, H., C. Krüger, H. E. Marcolin, and A. X. Trautwein. "Übergangsmetallkomplexe von Diazenen, XXIII [1]. Struktur und Mößbauer-Daten bi- und tricyclischer Ferracyclen / Transition Metal Complexes of Diazenes, XXIII [1] Structure and Mößbauer Data of Bi- and Tricyclic Ferracycles." Zeitschrift für Naturforschung B 42, no. 11 (1987): 1435–40. http://dx.doi.org/10.1515/znb-1987-1111.

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Mößbauer spectra of mono and dinuclear iron carbonyl complexes of three cyclic diazenes and the crystal structures of two products formed from (cis-diazene)Fe2(CO)6 and alkynes are reported. The ring size of the diazene ligand influences the stereochemistry of the cycloadducts obtained in the latter reaction; the bicyclic diazaferracycloalkene skeleton of these compounds leads to an exo- and endo-arrangement of one iron carbonyl group relative to the five- and six- membered diazene, rcspectively.

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Obaid, A., S. Basahl, A. Diefallah, and R. Abu-Eittah. "Spectral Investigations of the Effects of 60Co-Gamma Irradiation on Iodothyronine and Iodotyrosines." Applied Spectroscopy 41, no. 1 (1987): 74–79. http://dx.doi.org/10.1366/0003702874867918.

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Solids of 3-iodo-, 3–5–di-iodotyrosine and 3,5-di-iodothyronine were irradiated by 60Co-gamma irradiation for a period of about twenty hours. The effects of irradiation were investigated through a study of the UV and IR spectra of irradiated samples. UV spectra showed the presence of a new band at 360 nm which was assigned to the formation of IO−. IR spectra showed a strong carbonyl absorption and the removal of the carboxylate band in the case of thyronine only. For comparison, the spectra of the studied compounds were investigated before irradiation.

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37

Dhamelincourt, Marie-Claire, Marco Vecoli, Alberto Mezzetti, Christian Cesari, Gerard Versteegh, and Armelle Riboulleau. "Laser Raman micro-spectroscopy of Proterozoic and Palaeozoic organic-walled microfossils (acritarchs and prasinophytes) from the Ghadamis Basin, Libya and Volta Basin, Ghana." Spectroscopy 24, no. 3-4 (2010): 207–12. http://dx.doi.org/10.1155/2010/872050.

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Laser Raman microspectroscopy was used as a microchemical analysis technique to characterize the wall chemistry of organic-walled microfossils (acritarchs and prasinophytes) extracted from Proterozoic (Tonian: ca. 900 Myr) and early Palaeozoic (Silurian: ca. 420 Myr) marine sediments in the Volta Basin of Ghana, and the Ghadamis Basin of Libya, respectively. Raman spectra of Proterozoic acritarchs show spectral features characteristic of kerogenous compounds at ~1350 and ~1600 cm−1, consistently with previously published reports. In addition, spectra from prasinophyte algae from the Silurian s

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Dahn, Hans, Peter Péchy, and Vien Van Toan. "17O NMR Spectra of Carbonyl Compounds ArCOX: Influence of Groups X on the Polarity of the Carbonyl Group." Magnetic Resonance in Chemistry 35, no. 9 (1997): 589–92. http://dx.doi.org/10.1002/(sici)1097-458x(199709)35:9<589::aid-omr134>3.0.co;2-l.

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Rubtsova, Daria D., Alexandra A. Bobyleva, Daria D. Lezhnina, Sofia V. Polikarpova, Polina A. Rozhkova, and Vladimir L. Gein. "Synthesis of 5-aryl-3-hydroxy-1-(2-hydroxypropyl)-4-(furyl-2-carbonyl)- 3-pyrrolin-2-ones and 5-aryl-3-hydroxy-1-(3-hydroxypropyl)- 4-(furyl-2-carbonyl)-3-pyrrolin-2-ones." Butlerov Communications 63, no. 9 (2020): 26–30. http://dx.doi.org/10.37952/roi-jbc-01/20-63-9-26.

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In this work, pyrrolidin-2-ones and their derivatives are considered as a promising class of non-aromatic heterocyclic compounds. Their structure is found in the nuclei of many natural products and biologically active molecules. In pharmacy the possibility of introducing various substituents into the nucleus of pyrrolidin-2-ones is a great importance for the synthesis of new medicinal molecules with improved biological activity. Nowadays the synthesis of new active compounds by introducing various substituents at the C1-, C4- and C5-position of 3-hydroxy-3-pyrrolin-2-one has been little studie

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40

Jarolímová, L., J. Rysová, K. Cejpek, and J. Velíšek. "Factors affecting the formation of reducing compounds from biacetyl." Czech Journal of Food Sciences 22, SI - Chem. Reactions in Foods V (2004): S102—S105. http://dx.doi.org/10.17221/10627-cjfs.

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Antioxidative properties go with principal attributes of the Maillard reaction. Biacetyl, a reactive carbonyl intermediate formed in the initial stage of sugar transformations in the presence of amino acids, was found as an efficient precursor of several compounds with significant reducing activity which can act as antioxidants in real food systems. In this work, simple model systems of biacetyl were investigated under different conditions (amino compound involved, concentration, concentration ratio, reaction time, temperature and pH) to gain maximum yield of reducing power. Distribution of re

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Nyquist, R. A., R. Streck, and G. Jeschek. "NMR and IR spectra-structure correlations for carbonyl containing compounds in various solvents." Journal of Molecular Structure: THEOCHEM 377, no. 2 (1996): 113–28. http://dx.doi.org/10.1016/s0166-1280(96)91066-0.

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Bergmann, Ernst D., Y. Hirshberg, S. Pinchas та E. Zimkin. "Reaction products of primary β-hydroxy-amines with carbonyl compounds. III. Ultraviolet spectra". Recueil des Travaux Chimiques des Pays-Bas 71, № 2 (2010): 192–99. http://dx.doi.org/10.1002/recl.19520710210.

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Marconi, Giancarlo. "Quantum mechanical calculations on vibronic activity in the MCD spectra of carbonyl compounds." International Journal of Quantum Chemistry 36, no. 3 (1989): 417–25. http://dx.doi.org/10.1002/qua.560360322.

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Nyquist, R. A., R. Streck, and G. Jeschek. "NMR and IR spectra-structure correlations for carbonyl containing compounds in various solvents." Journal of Molecular Structure 377, no. 2 (1996): 113–28. http://dx.doi.org/10.1016/0022-2860(95)09120-3.

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Rao, Xin, Reiko Kobayashi, Rochelle White-Morris, Reggie Spaulding, Paul Frazey, and M. Judith Charles. "GC/ITMS Measurement of Carbonyls and Multifunctional Carbonyls in PM2.5 Particles Emitted from Motor Vehicles." Journal of AOAC INTERNATIONAL 84, no. 3 (2001): 699–705. http://dx.doi.org/10.1093/jaoac/84.3.699.

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Abstract A method was developed and tested to identify and quantitate carbonyls and multifunctional carbonyls in fine particulate matter (PM2.5; &lt;2.5 μm aerodynamic diameter). The method relies on ultrasonic extraction of particulate matter on filters at −8°C; derivatization with O-(2,3,4,5,6-pentafluorobenzyl) hydroxylamine (PFBHA), and PFBHA along with bis (trimethylsilyl) trifluoroacetamide (BSTFA); and detection of the derivatives by gas chromatography/ion trap mass spectrometry. Ultrasonic extraction of model compounds from enriched particles was affected by solvent polarity (water

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46

Mulyono, Noryawati, Christofora Hanny Wijaya, Dedi Fardiaz, and Wuryaningsih Sri Rahayu. "Identifikasi Komponen Kimia Damar Mata Kucing (Shorea Javanica) dengan Metode Pirolisis-GC/MS." Jurnal Natur Indonesia 14, no. 1 (2012): 155. http://dx.doi.org/10.31258/jnat.14.1.155-159.

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The aim of this research was to identify chemical compounds in cat eye dammar. The method included functional groups characterizationby infrared spectrophotometer and identification using Pyrolisis-GC/MS. Infrared spectra of crude sample showed that there were somefunctional groups such as alkyl, carbonyl, vinyl, and hydroxyl. Identification by Pyrolisis-GC/MS showed that dammar consisted of at least67 compounds. This natural gum components could be categorized into 4 groups, i.e. tetra cyclic hydrocarbon (30 compounds, 49.57%),penta cyclic (3 compounds, 2.56%), C 15 compounds (11 compounds, 1

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Kudalkar, Gaurav P., Virendra K. Tiwari, Joshua D. Lee, and David B. Berkowitz. "A Hammett Study of Clostridium acetobutylicum Alcohol Dehydrogenase (CaADH): An Enzyme with Remarkable Substrate Promiscuity and Utility for Organic Synthesis." Synlett 31, no. 03 (2020): 237–47. http://dx.doi.org/10.1055/s-0039-1691576.

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Described is a physical organic study of the reduction of three sets of carbonyl compounds by the NADPH-dependent enzyme Clostridium acetobutylicum alcohol dehydrogenase (CaADH). Previous studies in our group have shown this enzyme to display broad substrate promiscuity, yet remarkable stereochemical fidelity, in the reduction of carbonyl compounds, including α-, β- and γ-keto esters (d-stereochemistry), as well as α,α-difluorinated-β-keto phosphonate esters (l-stereochemistry). To better mechanistically characterize this promising dehydrogenase enzyme, we report here the results of a Hammett

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Ustinov, Ilya I., Irina V. Shakhkeldyan, Nikolay V. Khlytin, Yury M. Atroshchenko та Konstantin I. Kobrakov. "Amino acids in the double Mannich reaction with anionic σ-complexes of 5,7-dinitro-8-hydroxyquinoline". Butlerov Communications 60, № 11 (2019): 98–101. http://dx.doi.org/10.37952/roi-jbc-01/19-60-11-98.

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The synthesis of new derivatives of 3-azabicyclononan is one of the urgent tasks of modern synthetic organic chemistry. 3-Azabicyclononan is a structural analogue of the cytisine alkaloid, which is a strong agonist of acetylcholine receptors. Among synthetic heterocycles containing a 3-azabicyclo[3.3.1]nonane fragment, compounds with different types of biological activity have been discovered at present: analgesic, anti-inflammatory, antimicrobial, antioxidant, and others. The introduction of a fragment of azabicyclononan into the amino acid structure can lead to a limitation of the conformati

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Coleman, W. M., and Bert M. Gordon. "Examinations of the Matrix Isolation Fourier Transform Infrared Spectra of Organic Compounds: Part VIII." Applied Spectroscopy 42, no. 2 (1988): 304–9. http://dx.doi.org/10.1366/0003702884428130.

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Matrix isolation Fourier transform infrared (MI/FT-IR) data has been presented that documents the presence of discrete conformers in an argon matrix for a series of ketones. The distribution of conformers in the matrix was related to the structure of the molecule, in that rigid structures (i.e., small rings, bicyclic systems, and unsaturated systems) displayed simple carbonyl absorption patterns relative to those of their less rigid counterparts. Also, conformer isolation was seen for halosubstituted ketones. These results are in agreement with previous findings concerning the vapor-phase (VP)

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Yang, Li, Hans Ågren, Vincenzo Carravetta, and Lars G. M. Pettersson. "Static exchange and quantum defect analysis of x-ray absorption spectra of carbonyl compounds." Physica Scripta 54, no. 6 (1996): 614–24. http://dx.doi.org/10.1088/0031-8949/54/6/011.

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