Cleavage of C(aryl)−CH
<sub>3</sub>
Bonds in the Absence of Directing Groups under Transition Metal Free Conditions
作者:Peng‐Fei Dai、Xiao‐Shan Ning、Hua Wang、Xian‐Chao Cui、Jie Liu、Jian‐Ping Qu、Yan‐Biao Kang
DOI:10.1002/anie.201901783
日期:2019.4.8
carbon–carbon σ‐bonds, especially for unreactive hydrocarbons, remain limited. Activation by ring strain, directing groups, or in the presence of a carbonyl or a cyano group is usually required. In this work, by using a sequential strategy site‐selective cleavage and borylation of C(aryl)−CH3 bonds has been developed under directing group free and transitionmetalfree conditions. Methyl groups of various arenes
Polymerizable liquid crystal compound, composition and polymer
申请人:Itoh Maiko
公开号:US20100076171A1
公开(公告)日:2010-03-25
A polymerizable liquid crystal compound that has a wide liquid crystal phase temperature range and has a sterol ferulate skeleton, and a liquid crystal composition containing the compound are provided. A polymer that is excellent in various characteristics, and a molded article having optical anisotropy produced with the polymer are obtained with the polymerizable liquid crystal compound. The compound is represented by formula (1):
wherein R represents a sterol moiety derived from vegetable organisms; P represents one of polymerizable groups represented by formulae (P1) to (P8); X, Z, X
0
and Z
0
each represent a bonding group; and A represents a divalent group having a cyclic structure.