Relevant bibliographies by topics / Methyl Substituents

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Methyl Substituents'

Author: Grafiati
Published: 5 June 2025
Last updated: 1 August 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Methyl Substituents.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Methyl Substituents"

1

Bolton, R., RE Burley, and NJ Williams. "Stabilities of Carbonium-Ions. IV. Steric Effects in the Solvolysis of Substituted Diphenylmethyl Chlorides." Australian Journal of Chemistry 39, no. 4 (1986): 625. http://dx.doi.org/10.1071/ch9860625.

Full text
Abstract:
The replacement of ortho-hydrogen atoms by methyl groups in diphenylmethyl chloride has three distinguishable results upon the rate of solvolysis . Firstly, the alkyl groupactivates by its electronic effect; secondly, steric interactions diminish all observed substituent effects regardless of the position of the substituent in the aryl system; and thirdly, steric acceleration of the solvolysis can be seen in the rate of reaction of bis (2,6-dimethylphenyl)methyl chloride. The ortho-methyl substituents inhibit the formation of the planar transition state necessary to allow the greatest resonanc
APA, Harvard, Vancouver, ISO, and other styles
2

Fabijanić, Ivana, Atanas Kurutos, Ana Tomašić Paić, et al. "Selenium-Substituted Monomethine Cyanine Dyes as Selective G-Quadruplex Spectroscopic Probes with Theranostic Potential." Biomolecules 13, no. 1 (2023): 128. http://dx.doi.org/10.3390/biom13010128.

Full text
Abstract:
The binding interactions of six ligands, neutral and monocationic asymmetric monomethine cyanine dyes comprising benzoselenazolyl moiety with duplex DNA and RNA and G-quadruplex structures were evaluated using fluorescence, UV/Vis (thermal melting) and circular dichroism (CD) spectroscopy. The main objective was to assess the impact of different substituents (methyl vs. sulfopropyl vs. thiopropyl/thioethyl) on the nitrogen atom of the benzothiazolyl chromophore on various nucleic acid structures. The monomethine cyanine dyes with methyl substituents showed a 100-fold selectivity for G-quadrupl
APA, Harvard, Vancouver, ISO, and other styles
3

Kulhánek, Jiří, Oldřich Pytela, and Antonín Lyčka. "Chemometrical Analysis of Substituent Effects. XIII. Comparison of Substituent Effects on Dissociation and Chemical Shift in 13C NMR Spectra of Mono- and Disubstituted Benzoic Acids." Collection of Czechoslovak Chemical Communications 65, no. 1 (2000): 106–16. http://dx.doi.org/10.1135/cccc20000106.

Full text
Abstract:
The 13C chemical shifts have been measured of the carboxyl carbon atoms for all the 2-, 3-, and 4-substituted benzoic acids with H, CH3, CH3O, F, Cl, Br, I, and NO2 substituents, as well as for all 3,4-, 3,5-, and 2,6-disubstituted benzoic acids with combinations of CH3, CH3O, Cl (or Br), NO2 substituents and for symmetrically 2,6-disubstituted derivatives with Et, EtO, PrO, i-PrO, and BuO substituents. The chemical shifts of carboxylic group carbon atoms of the 3- and 4-substituted derivatives show correlation only with the substituent constants σI. For the 2-substituted derivatives was found
APA, Harvard, Vancouver, ISO, and other styles
4

Akinyemi, Akintunde, Courtney Thomas, Willis Marsh, Ray J. Butcher, Jerry P. Jasinski, and Lystranne A. Maynard-Smith. "Crystal structures of 4-methyl-2-oxo-2H-chromene-7,8-diyl diacetate and 4-methyl-2-oxo-2H-chromene-7,8-diyl bis(pent-4-ynoate)." Acta Crystallographica Section E Crystallographic Communications 72, no. 5 (2016): 704–8. http://dx.doi.org/10.1107/s2056989016005892.

Full text
Abstract:
In the structures of the two title coumarin derivatives, C14H12O6, (1), and C20H16O6, (2), one with acetate and the other with pent-4-ynoate substituents, both the coumarin rings are almost planar. In (1), both acetate substituents are significantly rotated out of the coumarin plane to minimize steric repulsions. One acetate substituent is disordered over two equivalent conformations, with occupancies of 0.755 (17) and 0.245 (17). In (2), there are two pent-4-ynoate substituents, the C[triple-bond]C group of one being disordered over two positions with occupancies of 0.55 (2) and 0.45 (2). One
APA, Harvard, Vancouver, ISO, and other styles
5

Furet, Pascal, George Hallak, Robert L. Matcha, and Richard Fuchs. "Substituent effects on acetylene stability. A comparison of STO-3G, 6-31G, 6-31G**, and 6-311G** calculations." Canadian Journal of Chemistry 63, no. 11 (1985): 2990–94. http://dx.doi.org/10.1139/v85-496.

Full text
Abstract:
Abinitio calculations using STO-3G, 6-31G, 6-31G**, and 6-311G** basis sets and standard geometries, and 6-31G and 6-311G** basis sets with 6-31G optimized geometries have been performed on a series of acetylene derivatives (H—C≡C—R; –R is —CH3, —Li, —C≡N, [Formula: see text] —NH2,—C≡CH, —CH—CH2, and —F). Substituent effects on stability have been studied using isodesmic methyl exchange reactions (H—C≡C—R + CH4 → H—C≡C—H + CH3R). STO-3G and 6-31G calculations have been carried out for methyl exchange reactions involving several large substituents including phenyl, and for the tert-butyl exchan
APA, Harvard, Vancouver, ISO, and other styles
6

La Scala, John J., Greg Yandek, Jason Lamb, et al. "The effect of methyl and methoxy substituents on dianilines for a thermosetting polyimide system." High Performance Polymers 32, no. 7 (2020): 801–22. http://dx.doi.org/10.1177/0954008319899141.

Full text
Abstract:
4,4′-Methylenedianiline (MDA) is widely used in high-temperature polyimide resins, including polymerization of monomer reactants-15. The toxicity of MDA significantly limits the manufacturability using this resin. Modifying the substitution and electronics of MDA could allow for the reduction of toxicity while maintaining the high-performing properties of the materials derived from the modified MDA. The addition of a single methyl substituent, methoxy substituent, location of these substituents, and location of the amine relative to the phenolic bridge were modified as were other non-aniline d
APA, Harvard, Vancouver, ISO, and other styles
7

Zhang, Cheng Gen, Ze Min Chen, Shu Yuan Yu, and Hong Chao Wei. "Structural and Electronic Properties of Small Silsesquioxanes: A DFT Study." Advanced Materials Research 548 (July 2012): 281–85. http://dx.doi.org/10.4028/www.scientific.net/amr.548.281.

Full text
Abstract:
Density functional theory (DFT) calculations are performed to investigate the structures of small silsesquioxanes (Si2nO3nX2n) (n=1-5 and X=H, F, Me). The large HOMO–LUMO gaps, which range from 5.41 to 9.17 eV, imply optimal electronic structures for these molecules. Furthermore, the substituent effect analysis indicate that the electron donating methyl group substituents lengthen the Si-O bond and largen the SiOSi bond angle, the electron withdrawing F atom substituents shorten the Si-O bond and lessen the SiOSi bond angle.
APA, Harvard, Vancouver, ISO, and other styles
8

Jasiewicz, Beata, Władysław Boczoń, and Joanna Kurek. "Synthesis and Conformational Analysis of New 17-Alkyl Derivatives of Lupanine and Their Perchlorate Salts." Collection of Czechoslovak Chemical Communications 69, no. 11 (2004): 2068–80. http://dx.doi.org/10.1135/cccc20042068.

Full text
Abstract:
New 17-alkyl derivatives of lupanine and their perchlorate salts have been synthesised. Substituents at C-17 are introduced by treatment of C(17)=N(16) immonium perchlorate 2 with alkylmagnesium compounds. NMR spectra of the new compounds have been taken to study the chemical shift changes caused by the introduced alkyl substituents, ethyl and butyl. In 17-alkyl derivatives (17-ethyl- (3) and 17-butyllupanine (4)) the substituent is equatorially oriented. All the lupanine derivatives analysed have the same structure, i.e. ring C in a boat conformation. The reaction of 17-butyllupanine (4) and
APA, Harvard, Vancouver, ISO, and other styles
9

Cheng-Sánchez, Iván, José A. Torres-Vargas, Beatriz Martínez-Poveda, et al. "Synthesis and Antitumor Activity Evaluation of Compounds Based on Toluquinol." Marine Drugs 17, no. 9 (2019): 492. http://dx.doi.org/10.3390/md17090492.

Full text
Abstract:
Encouraged by the promising antitumoral, antiangiogenic, and antilymphangiogenic properties of toluquinol, a set of analogues of this natural product of marine origin was synthesized to explore and evaluate the effects of structural modifications on their cytotoxic activity. We decided to investigate the effects of the substitution of the methyl group by other groups, the introduction of a second substituent, the relative position of the substituents, and the oxidation state. A set of analogues of 2-substituted, 2,3-disubstituted, and 2,6-disubstituted derived from hydroquinone were synthesize
APA, Harvard, Vancouver, ISO, and other styles
10

Aksenov, Nicolai A., Dmitrii A. Aksenov, Daniil D. Ganusenko, et al. "Synthesis of Dimethyl (Z)-((3-oxoindolin-2-ylidene) (aryl)methyl)phosphonates Through Tandem Cadogan and Arbuzov Reactions." Molbank 2025, no. 2 (2025): M2002. https://doi.org/10.3390/m2002.

Full text
Abstract:
A novel method employing a tandem Cadogan and Arbuzov reaction sequence has been developed, providing access to a series of previously unreported dimethyl (Z)-((3-oxoindolin-2-ylidene)(aryl)methyl)phosphonates. Restricted rotation of the aryl substituent, particularly in the presence of ortho substituents, gives axial chirality to these compounds.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Methyl Substituents"

1

Bezuidenhout, Daniela Ina. "Multimetal complexes of Fischer carbenes." Thesis, University of Pretoria, 2010. http://hdl.handle.net/2263/28973.

Full text
Abstract:
Fischer carbene complexes of the Group VI transition metals (Cr, Mo and W) containing at least two or three different transition metal substituents, all in electronic contact with the carbene carbon atom, were synthesized and studied both in solution and in the solid state. For the complexes of the type [M(CO)5{C(OR)R’}], the substituents chosen included (hetero)aromatic (benzene or thiophene) rings π-bonded to a chromium tricarbonyl fragment or ferrocene as the R’-substituent, while the OR-substituent was systematically varied between an ethoxy or a titanoxy group, to yield the complexes 1 (M
APA, Harvard, Vancouver, ISO, and other styles
2

Nakagawa, Atsushi. "Studies on methyl cello-oligosaccharides and methylcellulose derivatives with well-controlled substituent distribution -Syntheses and properties-." Kyoto University, 2012. http://hdl.handle.net/2433/158092.

Full text
Abstract:
Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(農学)<br>甲第17074号<br>農博第1957号<br>新制||農||1005(附属図書館)<br>学位論文||H24||N4713(農学部図書室)<br>29794<br>京都大学大学院農学研究科森林科学専攻<br>(主査)教授 髙野 俊幸, 教授 西尾 嘉之, 教授 木村 恒久<br>学位規則第4条第1項該当
APA, Harvard, Vancouver, ISO, and other styles
3

Khon, Dmitriy. "Part I: Synthesis and Study of Nonacene Derivatives; Part II: Optoelectronic Properties of Metal-Semiconductor Nanocomposites in Strongly Coupled Regime." Bowling Green State University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1304537573.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Green, Michael Roger. "Ligand and substituent effects on the electronic structures of mononuclear transition metal complexes /." The Ohio State University, 1987. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487331541710079.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Cromer, Rémy. "Porphyrines n-substituees : modelisation de l'inhibition d'hemoproteines." Université Louis Pasteur (Strasbourg) (1971-2008), 1986. http://www.theses.fr/1986STR13015.

Full text
Abstract:
Migration cobalt-azote des groupements : phenyl et styryl. L'etude des reactions de migration dans les porphyrines de cobalt(iii) aryliques a justifie l'utilisation de ces dernieres pour modeliser l'hydrazinolyse des hemoproteines. Les porphyrines de cobalt(iii) aryliques ont un comportement analogue a celui des porphyrines de fer(iii) aryliques. Oxydation des styryl -co(iii) porphyrines. Mecanisme de reaction. Extension de cette reaction a la cyclisation en serie arylique qui permet la synthese de la premiere porphyrine n,n'-(phenylene-1,2) analogue du produit d'inhibition suicide obtenu apre
APA, Harvard, Vancouver, ISO, and other styles
6

Moore, Adam L. "N-heterocyclic carbenes with pendant arylamine donor substituents as supports for metal-metal interactions of closed shell metal ions." abstract, 2008. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3326620.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Magalhães, Janildo Lopes. "Propriedades fotofísicas de substituintes aromáticos em derivados da N-metil-1,8-naftalimida: uma correlação entre dados teóricos e experimentais." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/75/75132/tde-05062007-114952/.

Full text
Abstract:
Os compostos N-metil-1,8-naftalimida (NI), 4-fenóxi-N-metil-1,8-naftalimida (PNI) e 4-naftóxi-N-metil-1,8-naftalimida (NNI) foram sintetizados e caracterizados por técnicas usuais de caracterização de compostos orgânicos. As propriedades fotofísicas desses compostos foram estudadas tanto no estado estacionário quanto resolvidas no tempo. Com base nessas medidas, verificamos que os espectros de absorção e de emissão apresentam deslocamento batocrômico quando os grupos fenóxi e naftóxi são introduzidos na posição C-4. Quando estes compostos são comparados com NI, os espectros de absorção apresen
APA, Harvard, Vancouver, ISO, and other styles
8

Xiao, Lan. "Etude physico-chimique de la complexation de divers ions metalliques (cu**(2+), ni**(2+) et co**(2+)) avec des dipeptides l-l contenant des chaines laterales non-coordinantes." Paris 7, 1988. http://www.theses.fr/1988PA077170.

Full text
Abstract:
Stabilite des complexes en fonction de l'interaction des chaines laterales du dipeptide et le solvant. Mesures potentiometriques calorimetriques, caracterisation spectrometrique et structure moleculaire
APA, Harvard, Vancouver, ISO, and other styles
9

Schwartz, Frédéric. "Etude des parametres d'elaboration de rubans amorphes par la methode du flot planaire : influence d'elements de substitution sur les proprietes d'un alliage amorphe fe::(79)b::(16)si::(5)." Paris 6, 1986. http://www.theses.fr/1986PA066574.

Full text
Abstract:
Description de la methode de filage depuis l'etat liquide. Influence des parametres de fabrication sur la qualite micrographique des rubans amorphes de composition donnee. Application de cette methode a l'amorphisation de l'alliage ferromagnetique fe::(79)b::(16)si::(5). Effet de la substitution de differents elements sur les temperatures de cristallisation et de curie de l'alliage ferromagnetique
APA, Harvard, Vancouver, ISO, and other styles
10

Yahya, Raïda. "Etudes thermodynamiques de la protonation et de la complexation de cryptands et d'amino-3 pyridazines." Université Louis Pasteur (Strasbourg) (1971-2008), 1986. http://www.theses.fr/1986STR13069.

Full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "Methyl Substituents"

1

Eland, John H. D., and Raimund Feifel. Mainly aliphatic molecules. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198788980.003.0007.

Full text
Abstract:
Double photoionisation spectra of homologous iodides and alcohols, acetonitrile, methyl mercaptan, acetaldehyde, acetone, norbornane, cyclooctatetraene, and TMMD are presented. Effects on the spectra of these molecules from electronic state congestion and geometry changes on ionisation mean that only the lowest dication states can be identified. As little detailed analysis of the individual spectra is possible, this chapter presents the molecules in groups rather than individually. In this chapter, molecules are ordered more thematically than strictly by size. The chapter starts with four homo
APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "Methyl Substituents"

1

Morimoto, Jumpei, Marin Yokomine, Takaya Yamazaki, and Shinsuke Sando. "Solid-Phase Synthesis of Peptides with Methyl and Larger Substituents on Backbone Amide Nitrogens via On-Resin Incorporation of the Substituents." In Methods in Molecular Biology. Springer US, 2025. https://doi.org/10.1007/978-1-0716-4562-8_6.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Neumann, W. P., and R. Stapel. "The Different Recombinations of Diphenyl Methyl Radicals Ph2 C.-R, R = tBu, CN, COOR’, COR’." In Substituent Effects in Radical Chemistry. Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4758-0_16.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Tsukano, Chihiro, Motohiro Yasui, and Yoshiji Takemoto. "Total Synthesis of Avenaol." In Modern Natural Product Synthesis. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-1619-7_18.

Full text
Abstract:
AbstractAvenaol is a terpene with a unique all-cis cyclopropane in which all bulky substituents are oriented in the same direction. It is categorized into a non-canonical strigolactone. We have synthesized alkylidenecyclopropanes by Rh-catalyzed intramolecular cyclopropanation of allenes, followed by iridium-catalyzed diastereoselective double bond isomerization to construct all-cis cyclopropanes. Subsequently, distinction of the two hydroxymethyl groups of 1,3-diol by an intramolecular SN1-type reaction, followed by cleavage of the tetrahydropyranyl ring by regioselective C–H oxidation, led t
APA, Harvard, Vancouver, ISO, and other styles
4

Lee, Jeong-Ik, Hong-Ku Shim, Geon Joon Lee, and Dongho Kim. "Synthesis of Poly(2-Methoxy-5-Methyl-1,4-Phenylene Vinylene); Substituent Effects on the Electrical and Nonlinear Optical Properties." In Polymers and Other Advanced Materials. Springer US, 1995. http://dx.doi.org/10.1007/978-1-4899-0502-4_35.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Briant, C. E., O. Johnson, D. W. Jones, and J. D. Shaw. "Stereochemistry of methyl and methoxy substituents in polycyclic hydrocarbons." In Organic Crystal Chemistry. Oxford University PressOxford, 1991. http://dx.doi.org/10.1093/oso/9780198553830.003.0009.

Full text
Abstract:
Abstract The molecular sites of methyl, methoxy and other simple substituents can have a marked influence on the biological activity of polycyclic aromatic hydrocarbons (PAH). Thus the carcinogenic activities of the monomethyl-(MBA), dimethyl-(DMBA) and polymethylbenz[a]anthracenes range from the negligible in 2-MBA or slight in-1,12-DMBA to the extremely potent in 7-MBA or 7,12-DMBA, even though the structure differences are relatively small. Much the same applies to substitution in phenanthrenes (Johnson et al., 1989), benzfluoranthenes and other PAH.
APA, Harvard, Vancouver, ISO, and other styles
6

Döpp, H., and D. Döpp. "Reactions of 2-Methyl Substituents of Naphtho[1,8-,][1,2,3]triazine." In Six-Membered Hetarenes with Two Unlike or More than Two Heteroatoms and Fully Unsaturated Larger-Ring Heterocycles. Georg Thieme Verlag KG, 2004. http://dx.doi.org/10.1055/sos-sd-017-00486.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

H. Parsania, Parsotam, Jignesh P. Patel, and Pooja P. Adroja. "Synthesis, Characterization, and Pathogenic Activities of Bisphenol-C Derivatives." In Pharmaceutical Science. IntechOpen, 2024. https://doi.org/10.5772/intechopen.113043.

Full text
Abstract:
We have focused on syntheses of several 1,1\'-bis(4-hydroxyphenyl)cyclohexane(Bisphenol-C) derivatives, their characterization, and pathogenic activities. The structures are supported by FTIR, 1H NMR, 13C NMR, and MS techniques. The crystal structure is determined by XRD. 1,1’-Bis(3-methyl-4-hydroxyphenyl)cyclohexane crystallizes into a mono-clinic crystal lattice having unit cell dimensions: a = 15.023(2) Å, b = 9.924(2) Å, and c = 11.620(2)Å, 1, 1’-bis(3-methyl-4-benzoyloxyphenyl)cyclohexane crystallizes into a tetragonal crystal lattice with unit cell dimensions: a = b = 13.3792(9)Å, and c
APA, Harvard, Vancouver, ISO, and other styles
8

Cave, A. "Acetogenins from Annonaceae." In Phytochemistry of Plants Used in Traditional Medicine. Oxford University PressOxford, 1995. http://dx.doi.org/10.1093/oso/9780198577751.003.0010.

Full text
Abstract:
Abstract Acetogenins from Annonaceae are a series of C-35/C-37 natural products of polyketide origin derived from fatty acids. Their structure is characterized by a long alkyl chain bearing a terminal unsaturated methyl y-lactone (sometimes rearranged to a propanone y-lactone), one or two tetrahydrofuran rings, several oxygenated substituents (hydroxyl, acetoxyl, ketone), and in some cases a double bond and/or epoxy group (Fig. 10.1). To date, they have been isolated only from the Annonaceae.Annonaceous acetogenins exhibit a broad range of potent biological activities, especially antitumoural,
APA, Harvard, Vancouver, ISO, and other styles
9

Lin, Gui, and Ronald H. Baney. "Poly(methylsilsesquioxane)." In Polymer Data Handbook. Oxford University PressNew York, NY, 2009. http://dx.doi.org/10.1093/oso/9780195181012.003.0148.

Full text
Abstract:
Abstract The structure of poly(phenylsilsesquioxane) depends upon the method of preparation. The structure is a function of the concentration of the initial monomer, the nature of the solvent, the nature of the hydrolysable substituents, the concentration of water, the temperature, the type of catalyst, and the nature of the non-hydrolysing substituent.
APA, Harvard, Vancouver, ISO, and other styles
10

Keller, P. A. "Oxo/Thioxo Anhydrides by Cyclization of Aromatic Compounds with ­Adjacent Methyl and Carboxylic Acid Substituents." In Three Carbon-Heteroatom Bonds: Acid Halides; Carboxylic Acids and Acid Salts. Georg Thieme Verlag KG, 2007. http://dx.doi.org/10.1055/sos-sd-020-00638.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Methyl Substituents"

1

Kouznetsov, D. L., O. Yu Podkopaeva, Yu V. Chizhov, G. P. Antroshenko, S. M. Shevchenko, and A. I. Altsybeeva. "Relationship between the Structure and Activity of Volatile Corrosion Inhibitors Derived from Cyclic Amines." In CORROSION 2001. NACE International, 2001. https://doi.org/10.5006/c2001-01192.

Full text
Abstract:
Abstract Products of the condensation reaction between morpholine or cyclohexylamine and benzaldehydes have been used extensively as volatile inhibitors of atmospheric corrosion, as well as components of lubricant compositions, biocides and preservatives in automotive cooling liquids and fuels. In this study, we examined the relationship between the electronic structure and inhibition performance of the compounds in an atmospheric corrosion test. The condensation products have significantly lower vapor pressure than parent amines, resulting in longer residence times of inhibitor species at a m
APA, Harvard, Vancouver, ISO, and other styles
2

Kopecky, Sarah E. "Investigation of Substituent Effects on the Corrosion Inhibition of Pyridine Derivatives with Acetylenic Alcohols on Steel in Acid Media." In CORROSION 2015. NACE International, 2015. https://doi.org/10.5006/c2015-05569.

Full text
Abstract:
Abstract The corrosion inhibition of substituted pyridine derivatives and quaternized pyridines in the presence and absence of acetylenic alcohol synergists is reported. Electrochemical Frequency Modulation (EFM) was used as a method of monitoring corrosion rates of steel in acidic environments. Early stage pitting was evaluated via scanning electron microscope (SEM) for comparison of measured corrosion rates to observed pit formation. EFM was found to be a reliable and accurate method of monitoring general corrosion rates over time, and causality factor data was found to depend heavily on the
APA, Harvard, Vancouver, ISO, and other styles
3

Andreev, N. N., and Yu I. Kuznetsov. "Progress in the Fundamentals of Volatile Inhibitors of Atmospheric Corrosion of Metals." In CORROSION 2004. NACE International, 2004. https://doi.org/10.5006/c2004-04413.

Full text
Abstract:
Abstract This paper presents a review of studies on volatile corrosion inhibitors (VCIs) for humid atmospheres. Emphasis is on the mechanisms of interaction of VCIs with the atmosphere and on methods for quantitative estimation of the volatility of organic compounds. The possibility of predicting the volatility of corrosion inhibitors based on their chemical structure and the scale of ξR-constants of substituents is analyzed. Corrosion initiation by mass and heat transfer in systems protected by VCIs is discussed. The importance of chemisorption in the efficiency of metal protection by VCIs an
APA, Harvard, Vancouver, ISO, and other styles
4

Soriaga, Manuel P., G. M. Berry, C. Bhardwaj, et al. "Chemisorption of Organic Molecules on Metal Electrode Surfaces." In CORROSION 1990. NACE International, 1990. https://doi.org/10.5006/c1990-90300.

Full text
Abstract:
Abstract The chemisorption of various organic functional groups from aqueous solutions onto smooth single-crystal and polycrystalline electrodes, and the resistance of the resulting monolayer intermediates towards electrochemical oxidation have been studied; these investigations were motivated by the need to understand, at the atomic level, metal passivation by monolayer organic coatings. The electrodes employed were Rh, Pd, Ir, Pt, and Au whose anodic dissolution is preceded by surface-oxide formation even in highly acidic media. Resistance towards anodic oxidation can thus be associated with
APA, Harvard, Vancouver, ISO, and other styles
5

Malenov, Dušan P., Jelena P. Blagojević Filipović, and Snežana D. Zarić. "Substituent effects on stacking interactions of aromatic ligands in organometallic compounds – chemoinformatics and quantum chemical study." In 2nd International Conference on Chemo and Bioinformatics. Institute for Information Technologies, University of Kragujevac, 2023. http://dx.doi.org/10.46793/iccbi23.625m.

Full text
Abstract:
The effects of alkyl substituents on stacking interactions of aromatic ligands in organometallic compounds were studied on two most common ligands with substituents –pentamethylcyclopentadienyl (Cp*) and 1-methyl-4-sopropylbenzene (p-cymene). The analysis of geometries of interactions found in crystal structures deposited in the Cambridge Structural Database indicated that substituents are involved in interactions with aromatic rings, indicating the combination of stacking and C-H/π interactions for both Cp* and p-cymene ligands. Quantum chemical calculations on p-cymene half-sandwich rutheniu
APA, Harvard, Vancouver, ISO, and other styles
6

Molis, Steven E., and Robert J. Twieg. "Fourier-transform IR characterization of molecular orientation in poled polymer glasses." In OSA Annual Meeting. Optica Publishing Group, 1990. http://dx.doi.org/10.1364/oam.1990.the2.

Full text
Abstract:
The electro-optical activity of organic, nonlinear optical (NLO) systems in part depends on the extent of molecular orientation of the NLO moiety. In this investigation, the technique of using infrared absorption spectroscopy to characterize molecular orientation is introduced as a means of characterizing orientational order in poled polymer glasses. A quantitative understanding of this orientation can be used in modeling the field-induced orientation of a dipole as well as for determining the polarizabilities of new NLO substituents. In this initial investigation the orientation of organic gu
APA, Harvard, Vancouver, ISO, and other styles
7

Volodymyr, Shibanov. "The Influence of Substituents Nature on the Chemical Shifts Values of Methyl Protons in the 1H NMR Spectra of 1,1,2,2-Tetrasubstituted Arylpropanes." In The 18th International Electronic Conference on Synthetic Organic Chemistry. MDPI, 2014. http://dx.doi.org/10.3390/ecsoc-18-e010.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Praveen, P. A., and R. Ramesh Babu. "Effect of substituents on polarizability and hyperpolarizability values of benzimidazole metal complexes." In DAE SOLID STATE PHYSICS SYMPOSIUM 2015. Author(s), 2016. http://dx.doi.org/10.1063/1.4947977.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Sanghadasa, Mohan, Bin Wu, Ronald D. Clark, Huaisong Guo, and Benjamin G. Penn. "Third-order nonlinear optical properties of metal phthalocyanines with butoxy and decyloxy substituents." In Optical Science, Engineering and Instrumentation '97. SPIE, 1997. http://dx.doi.org/10.1117/12.284248.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Baum, T. H. "Laser-induced vapor deposition of gold." In International Laser Science Conference. Optica Publishing Group, 1986. http://dx.doi.org/10.1364/ils.1986.fg4.

Full text
Abstract:
Dimethylgold (III) acetylacetonate and its fluorinated derivatives are ideal precursors for the deposition of gold. Thermal decomposition from the vapor phase allows high quality metal to be produced. A comparison of the gold complex utilized and the overall rates of deposition are highlighted; the presence of fluorine substituents in the complex causes an increase in the complex vapor pressure and in the observed rates of gold deposition.
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Methyl Substituents"

1

Wongkasemjit, Sujitra. Novel synthesis study of high surface area silica : final report. Chulalongkorn University, 2002. https://doi.org/10.58837/chula.res.2002.71.

Full text
Abstract:
The sol-gel transition of tetra-coordinated spirosilicate via hydrolysis and condensation under acidic and basic conditions is examined to elucidate the effect of catalyst, reaction time and temperature on the properties of obtained gel. The main advantage of this process is the low temperature employed, producing a solid network with a high specific surface area. FTIR spectroscopy and TGA analysis were used to characterize the formation of siloxane bonds (Si-O-Si). It is found that spirosilicate can be hydrolyzed under both acid and base catalyzed conditions. The condensation rate to silicate
APA, Harvard, Vancouver, ISO, and other styles
2

Ruangpornvisuti, Vithaya. A Study of conformational equilibrium of semicarbazone derivatives and their complexes with cations : research report. Chulalongkorn University, 2006. https://doi.org/10.58837/chula.res.2006.36.

Full text
Abstract:
The structure optimizations of picolinaldehyde N-oxide thiosemicarbazone (Hpiotsc), 2-benzoylpyridine semicarbazone (H2BzPS), their imino tautomers and their complexes with Ni(II), Cu(II) and Zn(II) were carried out using DFT calculations at the B3LYP/LANL2DZ level of theory. Thermodynamic properties of tautomerizations of Hpiotsc and H2BzPS and complexations of their complexes derived from the frequency calculations at the same level were obtained. The B3LYP/LANL2DZ-optimized geometry parameters for the complexes of [[Ni(Hpiotsc)[subscript 2]][superscript 2+]], [Cu(Hpiotsc).Cl[subscript 2]] a
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Methyl Substituents' for particular source types:
Journal articles Dissertations / Theses
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography