Relevant bibliographies by topics / Equatorial methyl group

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Academic literature on the topic 'Equatorial methyl group'

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

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Journal articles on the topic "Equatorial methyl group"

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N, Sharmila, Nageswara Rao B, Ramana G.V., and Satyanarayana P.V.V. "13C NMR Spectroscopy: A Tool for Study of Conformational Analysis of 2-Aryl-trans-decahydroquinolin-4-ols." Caribbean Journal of Science and Technology 07, no. 01 (2019): 76–87. http://dx.doi.org/10.55434/cbi.2019.7110.

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In this investigation, proton decoupled 13C NMR Spectroscopy was used as a tool for the study of conformations of differently substituted 2-aryl-trans-decahydroquinolin-4-ols. The fusion of the rings in 2-aryl-trans-decahydroquinolin-4-ols was conclusively proved to be trans-, from a comparison of the experimental and calculated values. The signal assignments were made on the basis of the model system and in this case trans-decahydroquinoline was taken as model system. Substituent parameters for methyl, hydroxyl, and phenyl groups were derived from analogous systems and incorporated in the mod
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Massywestropp, RA, RA Massywestropp, ERT Tiekink, ERT Tiekink, LM Tippett, and LM Tippett. "Crystal Structure and Equilibration of 1-[(1R*,4S*)-4,5,8-Trimethyl-1,2,3,4-tetrahydronaphthalen-1-yl]ethanone, C15H20O." Australian Journal of Chemistry 46, no. 2 (1993): 239. http://dx.doi.org/10.1071/ch9930239.

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The crystal structure of 1-[(1R*,4S*)-4,5,8-trimethyl-1,2,3,4-tetrahydronaphthalen-1-yl]ethan-one showed a half-chair conformation with the methyl group pseudo-axial and the acetyl group pseudo-equatorial. Equilibration gave a trans-to-cis ratio of 5:2.
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Chen, Guangwu, Richard W. Franck, Guangli Yang, and Michael Blumenstein. "Anomeric effects of sulfones." Canadian Journal of Chemistry 80, no. 8 (2002): 894–99. http://dx.doi.org/10.1139/v02-095.

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The anomeric effect of the sulfone group in tetrahydropyrans has been determined. The value is >2 kcal mol–1, which is larger than the A-value of a methyl group but less than the A-value of the sulfone in a tetrahydropyran. Hence, in an unsubstituted tetrahydropyranyl sulfone, the equatorial conformer predominates, whereas in a properly substituted methyltetrahydropyranyl sulfone, an axial sulfone is preferred over an axial methyl group.Key words: sulfone, tetrahydropyran, anomeric effect.
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Petrović, Vesna, Ivan Halasz, Srđanka Tomić та Dubravka Matković Čalogović. "Methyl 4-O-pivaloyl-β-D-xylopyranoside". Acta Crystallographica Section E Structure Reports Online 62, № 7 (2006): o2746—o2748. http://dx.doi.org/10.1107/s1600536806021052.

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The six-membered ring of the title compound, C11H20O6, adopts the chair conformation, with the 4-O-pivaloyl group in an equatorial position. Two vicinal hydroxyl groups of each molecule form four hydrogen bonds of the O—H...O type in a one-dimensional chain running along the b axis.
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5

Brecknell, Douglas J., Raymond M. Carman, Ross A. Edwards, Karl A. Hansford, Tomislav Karoli, and Ward T. Robinson. "Halogenated Terpenoids. XXIX The 1-Bromo 1-Bromomethyl Cyclohexyl System." Australian Journal of Chemistry 50, no. 7 (1997): 689. http://dx.doi.org/10.1071/c96188.

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Bromination of methylene groups exocyclic to cyclohexyl systems normally affords two isomeric products; the axial 1-bromo equatorial 1-bromomethyl compound and the axial 1-bromomethyl equatorial 1-bromo derivative. Free energy differences between these two isomers, and the conformations adopted by the axial 1-bromomethyl group, have been explored by n.m.r. spectroscopy, by X-ray crystallography and by MM3 calculations. Evidence is presented to show that the ax-bromomethyl group exists primarily as those rotamers which site the bromine atom synclinal to the vicinal bromine. The A value for a br
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Hiller, W., A. Castiñeiras, M. E. García- Fernandez, M. R. Bermejo, J. Bravo, and A. Sanchez. "The Crystal Structure of TlBrI2(4-methylpyridine-N-oxide)2." Zeitschrift für Naturforschung B 43, no. 1 (1988): 132–33. http://dx.doi.org/10.1515/znb-1988-0123.

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Abstract The unit cell of TlBrI2 (4-methylpyridine-N-oxide) 2 is orthorhombic, space group Pnna. with a = 1126.9(3),b = 919.8(2),c = 1210.4(3) pm.and Z = 4. The structure consists of discrete TlBrI2 (4-methyl-pyridine-N-oxide)2 molecules which have a distorted trigonal-bipyramidal geometry. The thallium atom is coordinated to two iodine atoms and a bromine atom in equatorial positions, and by two 4-methyl-pyridine-N-oxide ligands in the axial positions.
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7

Thiruvalluvar, A., and S. Ponnuswamy. "2,4,4-Trimethyl-N-phenyl-2,3,4,5-tetrahydro-1H-1,5-benzodiazepine-1-carboxamide." Acta Crystallographica Section E Structure Reports Online 63, no. 11 (2007): o4264. http://dx.doi.org/10.1107/s1600536807048519.

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In the title compound, C19H23N3O, the seven-membered diazepine ring adopts a boat conformation. The phenylcarbamoyl group is coplanar with the N atom and its two attached C atoms. The methyl group at position 2 has an equatorial orientation. The dihedral angle between the two benzene rings is 81.07 (9)°. The crystal structure is stabilized by intramolecular C—H...O and intermolecular N—H...O hydrogen bonds.
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Oilunkaniemi, Raija, Risto S. Laitinen та Markku Ahlgrén. "The Crystal and Molecular Structure of (μ-Oxo)bis{chloro(methyl)thienyl- tellurium(IV)}". Zeitschrift für Naturforschung B 56, № 2 (2001): 215–18. http://dx.doi.org/10.1515/znb-2001-0215.

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Abstract The formation and the crystal and molecular structure of (μ-oxo)bis{chloro(methyl)thienyl-tellurium(IV)}, [Me(Th)TeCl]20 , are described. The compound is orthorhombic, space group Pbcn, a = 1893.30(2), b = 891.96(2), c = 966.24(5) pm; Z =4. The tellurium atom shows trigonal bi-pyramidal coordination with chlorine and the bridging oxygen atoms in axial, and methyl and thienyl groups in equatorial positions. The two close intermolecular Te(1) ···Cl(1) contacts ex­pand the coordination sphere around tellurium to an almost regular octahedron.
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Boczoń, Władysław, and Beata Jasiewicz. "Synthesis and Conformational Analysis of Disubstituted Sparteine Derivatives." Collection of Czechoslovak Chemical Communications 68, no. 4 (2003): 696–710. http://dx.doi.org/10.1135/cccc20030696.

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Synthesis of disubstituted sparteine derivatives and their diperchlorate salts was performed. Their IR and NMR spectra were analysed to determine the structure of these compounds, as well as the substituent and the protonation effects. It was shown that both unsaturated (2,17β-dimethyl-2,3-didehydrosparteine (12), 17β-isopropyl-2-methyl-2,3-didehydrosparteine (13)) and saturated (2,17β-dimethylsparteine (14), 17β-isopropyl-2-methylsparteine (15)) newly obtained sparteine derivatives have the same configurational-conformational system: trans A/B chair/chair, trans C/D boat/chair. The methyl and
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10

Mohandas, T., M. Velayutham Pillai, T. Vidhyasagar, A. Pasupathy, and P. Sakthivel. "Methyl ({[(4E)-1,3-dimethyl-2,6-diphenylpiperidin-4-ylidene]amino}oxy)acetate." Acta Crystallographica Section E Structure Reports Online 70, no. 5 (2014): o513. http://dx.doi.org/10.1107/s1600536814006667.

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In the title compound, C22H26N2O3, the piperidine ring exhibits a chair conformation. The phenyl rings attached to the piperidine at the 2- and 6-positions have axial orientations. These rings make a dihedral angle of 49.75 (11)°. The aminooxy acetate group attached at the 4-position has an equatorial orientation. In the crystal, inversion dimers linked by pairs of C—H...π interactions occur.
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Book chapters on the topic "Equatorial methyl group"

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"Vitamin B12: Two Coenzyme Forms." In The Chemical Biology of Human Vitamins. The Royal Society of Chemistry, 2018. http://dx.doi.org/10.1039/bk9781788014649-00275.

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The eighth and last of the B vitamins is B12, an apparent evolutionary holdover from the days of anaerobic bacterial metabolism. Among its distinctions B12 has a macrocyclic, contracted tetrapyrrolic corrin ring system, with a cobalt ion in the central equatorial plane. The cobalt can cycle between Co(3+), Co(2+), and Co(1+). The top axial ligand can be water (aquocobalamin) or 5-deoxyadenosyl (adenosyl-B12) or a methyl group (methyl B12). B12 engages in only two steps in human metabolism but both are essential for health. The adenosyl-B12 mediates radical chemistry for converting methylmalony
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Taber, Douglass F. "Functional Group Oxidation and Reduction." In Organic Synthesis. Oxford University Press, 2015. http://dx.doi.org/10.1093/oso/9780190200794.003.0008.

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Debabrata Maiti of the Indian Institute of Technology Bombay found (Chem. Commun. 2012, 48, 4253) that the relatively inexpensive Pd(OAc)2 effectively catalyzed the decarbonylation of an aldehyde 1 to the hydrocarbon 2. Hui Lou of Zhejiang University used (Adv. Synth. Catal. 2011, 353, 2577) a Mo catalyst to effect reduction of the ester 3 to the hydrocarbon 4, with retention of all the skeletal carbons. Jon T. Njardarson of the University of Arizona showed (Chem. Commun. 2012, 48, 7844) that the allylic ether 5 could be reduced with high regioselectivity to give 6. José Barluenga and Carlos V
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Taber, Douglass F. "The Smith Synthesis of (−)-Nodulisporic Acid D." In Organic Synthesis. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780190646165.003.0103.

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The nodulisporic acids, isolated from the endophytic fungus Nodulisporium sp., show promising insecticidal activity. Amos B. Smith III of the University of Pennsylvania envisioned (J. Am. Chem. Soc. 2015, 137, 7095) the construction of the central indole of nodulisporic acid D 4 by the convergent coupling of the chloroaniline 1 with the enol triflate 2. The preparation of 2 began (Org. Process Res. Dev. 2007, 11, 19) with the mono­ketal 5 of the Wieland–Miescher ketone, available in enantiomerically-pure form by organocatalyzed Robinson annulation. Condensation with thiophenol and formal­dehyd
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4

Taber, Douglass F. "The Kuwahara Synthesis of Paspalinine." In Organic Synthesis. Oxford University Press, 2015. http://dx.doi.org/10.1093/oso/9780190200794.003.0102.

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The hexacyclic indole diterpenoid paspalinine 3, produced by the ergot Claviceps paspali, induces tremors in domestic animals that graze on pasture grass infected by that fungus. Shigefumi Kuwahara of Tohoku University envisioned (Angew. Chem. Int. Ed. 2012, 51, 12833) assembly of the tetracyclic nucleus of 3 by the oxidative cyclization of 1 to 2. The challenge, then, was the assembly of the angularly substituted trans–anti-trans-6-6-5 alicyclic nucleus of 1. The synthesis began with the Wieland-Miescher ketone 4, which is available commercially in enantiomerically pure form. Exposure to ethy
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Winter, Mark J. "Molecular geometry: VSEPR." In Chemical Bonding. Oxford University Press, 2016. http://dx.doi.org/10.1093/hesc/9780198700951.003.0004.

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This chapter focuses on the VSEPR (valence shell electron pair repulsion) method. The VSEPR method is a simple algorithm to determine the geometry and shape of main group compounds based upon their Lewis structure. Bonding pairs of electrons and lone pairs attached to a central atom are distributed in space so as to minimize electron–electron repulsions between all the attached bonding and lone pairs. Double and triple bonds only occupy one vertex, while lone pairs and multiple bonds take up more room than bonding pairs. Lone pairs in trigonal bipyramidal compounds are always located in the eq
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Conference papers on the topic "Equatorial methyl group"

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Braun, Benjamin, and Markus Markgraf. "Evaluating differential GNSS techniques for landing the 1st stage of an RLV – with a skydiver experiment." In ESA 12th International Conference on Guidance Navigation and Control and 9th International Conference on Astrodynamics Tools and Techniques. ESA, 2023. http://dx.doi.org/10.5270/esa-gnc-icatt-2023-186.

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As part of the trinational technology demonstration project CALLISTO (“Cooperative Action Leading to Launcher Innovation for Stage Toss-back Operations”), JAXA, CNES, and DLR are jointly developing key technologies for a future European reusable launch vehicle (RLV). The goal of the project is to build and fly a vertical take-off vertical landing (VTVL) launch vehicle demonstrator that returns to the launch site (RTLS) after its mission. In 2025, there will be ten different test flights with increasing apogee altitudes from several meters to up to 45 kilometers and increasingly complex traject
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