Highly Branched Alkanoic Acids from the Preen-Gland Wax of the Domestic Goose as Building Blocks for Chiral Triphenylenes
摘要:
The synthesis of chiral triphenylenes 7a,b bearing side chains derived from enantiomerically pure trimethyloctanoate la and tetramethyldecanoate 1b from the preen-gland wax of domestic goose was achieved in 3 or 4 steps. Compounds 7a,b were nonmesogenic; however, mixtures of 7a,b with hexakis(octyloxy)triphenylene or hexakis(decyloxy)triphenylene displayed columnar mesophases or soft crystal G phases, as was shown by differential-scanning calorimetry and optical-polarizing microscopy. Circular-dichroism measurements revealed weak associations of 7a,b in solution.
Highly Branched Alkanoic Acids from the Preen-Gland Wax of the Domestic Goose as Building Blocks for Chiral Triphenylenes
摘要:
The synthesis of chiral triphenylenes 7a,b bearing side chains derived from enantiomerically pure trimethyloctanoate la and tetramethyldecanoate 1b from the preen-gland wax of domestic goose was achieved in 3 or 4 steps. Compounds 7a,b were nonmesogenic; however, mixtures of 7a,b with hexakis(octyloxy)triphenylene or hexakis(decyloxy)triphenylene displayed columnar mesophases or soft crystal G phases, as was shown by differential-scanning calorimetry and optical-polarizing microscopy. Circular-dichroism measurements revealed weak associations of 7a,b in solution.
Diastereoselective synthesis of functionally substituted alkene dimers and oligomers, catalysed by chiral zirconocenes
作者:Pavel V. Kovyazin、Il'giz N. Abdullin、Lyudmila V. Parfenova
DOI:10.1016/j.catcom.2018.10.032
日期:2019.1
The research addresses the reaction of terminal alkenes and propene with AlR3 (R = Me, Et) in the presence of chiral Zr complexes, rac-[Y(η5-C9H10)2]ZrCl2 (Y = C2H4, SiMe2) or (NMI)2ZrCl2 (NMI- η5–neomenthylindenyl), and methylaluminoxane. The effect of reaction conditions, catalyst and trialkylalane structure on the substrate conversion and the reaction chemo- and stereoselectivity has been studied
研究地址末端烯烃的反应和丙烯与为AlR 3中的手性锆复合物,的存在下(R =甲基,乙基)外消旋- [Y(η 5 -C 9 ħ 10)2 ]的ZrCl 2(Y = C 2 ħ 4,森达2)或(NMI)2的ZrCl 2(NMI- η 5–neomenthylindenyl)和甲基铝氧烷。研究了反应条件,催化剂和三烷基铝烷结构对底物转化率以及反应化学和立体选择性的影响。该反应主要经历烯烃甲基(乙基)锆化的阶段,随后将底物分子引入Zr-C键中。结果,开发了用于合成官能取代的线性末端烯烃二聚体和丙烯低聚物的非对映选择性一锅法。
Die vorliegende Erfindung betrifft ein Verfahren zur regio-selektiven Oxidation einer Verbindung mit mehrfach methyl-verzweigter Kohlenwasserstoffkette durch ein Enzymsystem.
Highly Branched Alkanoic Acids from the Preen-Gland Wax of the Domestic Goose as Building Blocks for Chiral Triphenylenes
The synthesis of chiral triphenylenes 7a,b bearing side chains derived from enantiomerically pure trimethyloctanoate la and tetramethyldecanoate 1b from the preen-gland wax of domestic goose was achieved in 3 or 4 steps. Compounds 7a,b were nonmesogenic; however, mixtures of 7a,b with hexakis(octyloxy)triphenylene or hexakis(decyloxy)triphenylene displayed columnar mesophases or soft crystal G phases, as was shown by differential-scanning calorimetry and optical-polarizing microscopy. Circular-dichroism measurements revealed weak associations of 7a,b in solution.