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Russian Chemical Bulletin - The gas-phase copyrolysis of chlorotrifluoroethylene with buta-1,3-diene, penta-1,3-diene, or isoprene in a flow reactor at 440–480°C gave... 相似文献
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E. M. Popov G. M. Lipkind V. Z. Pletnev S. F. Arkhipova 《Chemistry of Natural Compounds》1973,7(2):175-181
Summary 1. The form of the potential surface of the methyl esters of -acetylamino acids and of the methylamides of -acetoxy acids is sensitive to the geometry of the side chain and to the presence of N-methyl groups in the main chain.2. The conformational states of the molecules considered are described by a limited number of canonical forms: R, B, L, and P.3. With respect to the interaction of the atoms of the main chain, the ester group is stereochemically equal to the amide group. The difference between these groups consists in small differences in interactions with the atoms of the side chains.M. M. Shemyakin Institute of the Chemistry of Natural Compounds, Academy of Sciences of the USSR. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 184–191, March, 1971. 相似文献
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E. M. Popov V. Z. Pletnev G. M. Lipkind S. F. Arkhipova 《Chemistry of Natural Compounds》1973,7(2):182-184
Summary 1. The most preferred extended conformations for Ac-L-Lac-L-Ala-OMe and Ac-L-Ala-L-Lac-NHMe in a polar medium are R-R, R-B, B-R, and B-B. Of the conformations with a hydrogen bond of the 1–4 type, the most stable are R-R and R-B.2. There is an interrelationship between the conformational states of neighboring hydroxy and amino acid residues.3. The stereochemical characteristics of the ester group are similar to those of the amide group.M. M. Shemyakin Institute of the Chemistry of Natural Compounds, Academy of Sciences of the USSR. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 191–194, March, 1971. 相似文献
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Russian Chemical Bulletin - The gas-phase co-pyrolysis of styrene with CHClF2 in a flow reactor at 550–650 °C gives 2,3-difluoronaphthalene in two parallel reaction channels. The main... 相似文献
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Russian Chemical Bulletin - The gas-phase pyrolysis of isomeric 2-chloro-2-fluoro-1-phenylcyclopropanes in a flow reactor at 250–430 °С gives 1-phenyl- and... 相似文献
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Vaporization enthalpies for the isomeric diazines were discussed within the context of recent measurements and estimation
techniques. It is suggested that pyridazine shows enigmatic behavior.
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Joel F. Liebman (Corresponding author)Email: |
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Vaporization enthalpies for methyl myristoleate (methyl Z 9-tetradecenonate), methyl 10-pentadecenoate, methyl palmitoleate (methyl Z 9-hexadecenoate), methyl Z 10-heptadecenoate, methyl oleate (methyl Z 9-octadecenoate), methyl linoleate (methyl Z,Z 9,12-octadecadienoate), methyl linolenate (methyl Z,Z,Z 9,12,15-octadecatrienoate), methyl Z 11-eicosenoate, methyl Z,Z 11,14-eicosadienoate, methyl Z,Z,Z 11,14,17-eicosatrieneoate, methyl arachidonate (methyl Z,Z,Z,Z 5,8,11,14-eicosatetraeneoate), methyl Z,Z,Z,Z,Z 5,8,11,14,17-eicosapentaeneoate, methyl erucate (methyl Z 13-docosaneoate), methyl Z,Z 13,16-docosadienoate, methyl Z,Z,Z,Z,Z,Z 4,7,10,13,16,19-docosahexaenoate and methyl nervonate (methyl Z 15-tetracosenoate) are evaluated at T = 298.15 and vapor pressures are evaluated over the temperature range T = 298.15-450 K by correlation gas chromatography. The results are generated by an interpolative process using literature values for the saturated fatty acid methyl esters (FAMEs) from methyl decanoate to methyl tetracosanoate, exclusive of methyl nonadecanoate, heneicosanoate and tricosanoate, as standards. Relationships for calculating vapor pressures for all of the compounds studied from T = 298.15 to 450 K are provided. 相似文献