17001-28-4Relevant articles and documents
Chiral molecular patterns of self-assembled ion pairs composed of (R,S), (S)-16-methyloctadecanoic acid and 4,4'-bipyridine
Qian,Nanjo,Yokoyama,Suzuki,Akasaka,Orhui
, p. 2021 - 2022 (2000)
Self-assembled monolayers of stearic acid, (R,S) and (S)-16-methyloctadecanoic acid ion-paired with 4,4'-bipyridine have been observed on a solution-graphite interface by a scanning tunneling microscope (STM) and the observed macro-scale molecular patterns have been interpreted in terms of absolute chirality of the constituent molecule.
METHOD FOR PRODUCING CROSS-COUPLING COMPOUND
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Page/Page column 15, (2010/01/29)
To provide a method for performing a cross-coupling reaction of a Grignard compound with an alkyl halide simply, efficiently and in high yield, a method for obtaining a ω-bromo long chain carboxylic acid simply and efficiently using an easily obtainable raw material and a method for producing a useful branched fatty acid simply and efficiently. [R1: an alkyl group having 1 to 15 carbon atoms, R2: an alkyl group having 1 to 30 carbon atoms with a carboxyl group and X and X': a halogen atom] [n : an integer of 9 to 17] [n : an integer of 9 to 17, R1a : a branched alkyl group having 3 to 8 carbon atoms and X: a halogen atom]
Chain-Substituted Lipids in Monolayer Films. A Study of Molecular Packing
Menger, F. M.,Wood, M. G.,Richardson, S.,Zhou, Q.,Elrington, A. R.,Sherrod, M. J.
, p. 6797 - 6803 (2007/10/02)
A series of highly purified fatty acids and phospholipids, each possessing a chain substituent of varying size (methyl, n-butyl, or phenyl) at varying locations (carbon 4, 8, 12, or 16 of an 18-carbon chain) were synthesized.Pressure-area isotherms, obtained with the aid of a film balance, revealed how these molecules, either individually or admixed, pack in monomolecular films.Two examples will illustrate here the type of information secured by the method. (a) The presence of a methyl at carbon 16 of a single phospholipid chain has a negligible effect on the molecular packing within a "liquid" film.A methyl on carbon 16 of both chains, on the other hand, is highly expansive.Even a single methyl at position 8 perturbs the film packing appreciably, thus indicating less available space near the center of the chain. (b) Deviation from ideality in mixed fatty acid films can be explained by interdigitation that reduces steric repulsion among the substituents.It is also possible to observe by means of film balance techniques the extrusion of 8-butylstearic acid when it contaminates a film composed largely of stearic acid.Approximate SHADOW calculations could, in many cases, provide film areas in reasonable agreement with experiment.