Amide transformations involving C-N bond cleavage are recognized as difficult reactions owing to the inert nature of amides resulting from resonance. Accordingly, a strong inductive effect and geometrical distortion reasonably decrease the resonance stabilization to attenuate the C-N linkage. Although the conversion of such activated amides has been studied intensively, reaction systems for unactivated
由于由共振引起的酰胺的惰性性质,涉及 CN 键断裂的酰胺转化被认为是困难的反应。因此,强感应效应和几何失真合理地降低了共振稳定性以衰减 CN 链接。尽管已经对此类活化酰胺的转化进行了深入研究,但未活化酰胺的反应体系尚未开发。我们在此报告了三氟甲磺酸锌 (II) [Zn(OTf)(2)] 催化剂在分子内酰基重排的帮助下实现了多种未活化的叔酰胺的酯化。该反应用于在温和的反应条件下一锅脱除各种酰胺基导向基团,以高产率得到相应的酯。
COMPOUND AND COLORED RESIN COMPOSITION
申请人:SUMITOMO CHEMICAL COMPANY, LIMITED
公开号:US20210002487A1
公开(公告)日:2021-01-07
An object of the present invention is to provide a novel squarylium dye that can achieve an equivalent chromaticity value of even a colored resin composition having a low content of the squarylium dye as compared with a colored resin composition comprising a conventional squarylium dye. The present invention provides a compound represented by the formula (I) wherein R
4
to R
4
each independently represent a hydrogen atom or the like; R
5
to R
8
each independently represent a hydrogen atom or the like; R
9
and R
10
each independently represent a monovalent saturated hydrocarbon group having 1 to 20 carbon atoms or the like; R
11
and R
12
each independently represent a halogen atom or an alkyl halide group having 1 to 6 carbon atoms; and m1 and m2 each independently represent an integer of 1 to 5.
Synthesis of Hydroxybenzoic Acids and Their Esters by Reaction of Phenols with Carbon Tetrachloride and Alcohols in the Presence of Iron Catalysts
作者:A. R. Bayguzina、L. I. Tarisova、R. I. Khusnutdinov
DOI:10.1134/s1070363218020056
日期:2018.2
Alkyl esters of hydroxy-, methoxy-, and ethoxybenzoic and cresotic acids have been synthesized by reaction of phenols, anisole, phenetole, and cresols with carbon tetrachloride and alcohols in the presence of iron catalysts.
A catalyst component for olefin polymerization and a catalyst comprising the same
申请人:China Petroleum & Chemical Corporation
公开号:EP2287208A1
公开(公告)日:2011-02-23
The present invention relates to a solid catalyst component for olefin polymerization comprising an α-cyanosuccinate compound as an internal electron donor, a catalyst comprising the catalyst component, and use of the catalyst in olefin polymerization. When used in propylene polymerization, the catalyst exhibits a higher catalytic activity and good hydrogen response, and the resulting polymer has a high isotacticity and a broad molecular weight distribution.
CATALYST COMPONENT FOR OLEFIN POLYMERIZATION AND PREPARATION METHOD THEREOF
申请人:China Petroleum & Chemical Corporation
公开号:EP2492290A1
公开(公告)日:2012-08-29
A catalyst component for olefin polymerization is disclosed, which comprises at least one diol ester type electron donor compound (a) and at least one diether type electron donor compound (b) among others, wherein the molar ratio of a to b is 0.55-50. A preparation method of the catalyst component, a catalyst comprising the catalyst component, and an olefin polymerization method using the catalyst which can especially be used for preparation of polypropylenes of low ash contents are also disclosed.