The exploration into challenging scenarios of the application of elementary reactions offers excellent opportunities for the development of unique transformations under organometallic catalysis. As a ubiquitous reaction of metal alkyl complexes, β-hydride elimination plays a crucial role in a number of important catalytic transformations. However, its functions in these catalytic cycles are limited
对基本反应应用的挑战性场景的探索为在有机金属催化下发展独特的转化提供了极好的机会。作为金属烷基配合物的普遍反应,β-氢化物消除在许多重要的催化转化中起着至关重要的作用。然而,它在这些催化循环中的功能仅限于释放烯烃产物或通过进一步迁移插入产生异构化中间体。在此,我们报道了 β-氢化物消除的精确操作能够实现自动串联铜催化,用于无向烯基 C-H 键与 CO 2的羧化。在这种转化中,促进了烷基铜中间体的 β-氢化物消除,同时它与 CO 反应2被压制。生成的氢化铜反过来与 CO 2反应,提供多任务催化剂的途径,这使得 C-H 键在两个机械上不同的催化循环中串联硼化/羧化。
RESIN COMPOSITION AND OPTICAL COMPENSATION FILM USING SAME
申请人:Tosoh Corporation
公开号:EP3208301A1
公开(公告)日:2017-08-23
To provide a resin composition suitable for an optical compensation film, an optical compensation film using the same, which is excellent in the retardation characteristics and wavelength dispersion characteristics, and a production method of an optical compensation film.
A resin composition containing, as resin components, from 30 to 99 wt% of a cellulose-based resin represented by the following formula (1) and from 1 to 70 wt% of a cinnamic acid ester copolymer.
(wherein each of R1, R2 and R3 independently represents hydrogen or a substituent having a carbon number of 1 to 12).
Resin composition and optical compensation film using same
申请人:TOSOH CORPORATION
公开号:US10126478B2
公开(公告)日:2018-11-13
A resin composition suitable for an optical compensation film, an optical compensation film using the same, which is excellent in the retardation characteristics and wavelength dispersion characteristics, and a production method of an optical compensation film. A resin composition containing, as resin components, from 30 to 99 wt % of a cellulose-based resin represented by the following formula (1) and from 1 to 70 wt % of a cinnamic acid ester copolymer:
where each of R1, R2 and R3 independently represents hydrogen or a substituent having a carbon number of 1 to 12.
Olefins are prevalent substrates and functionalities. The synthesis of olefins from readily available starting materials such as alcohols, amines and carboxylic acids is of great significance to address the sustainability concerns in organic synthesis. Metallaphotoredox-catalyzed defunctionalizations were reported to achieve such transformations under mild conditions. However, all these valuable strategies