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。
Multicomponent Reaction: Palladium-Catalyzed Carbonylation of Aryl Halides and Alkyl Halides to Aromatic Esters
作者:Fengxiang Zhu、Pengpeng Yin、Pengbo Zhang
DOI:10.1021/acs.joc.2c01794
日期:——
A convenient four-component reaction has been developed that allows for the direct transformation of aryl iodides with alkylhalides into the corresponding aromatic esters and diesters via palladium-catalyzed carbonylation with water as solvent. Various esters and diesters were isolated in moderate to good yields with broad functional group tolerance.
Titanium-magnesium/manganese-aluminum catalyst and process for olefin polymerization
申请人:PHILLIPS PETROLEUM COMPANY
公开号:EP0002521A1
公开(公告)日:1979-06-27
Polymerization of alpha monoolefins employing a catalyst comprising (A) a component formed by intensive mixing (milling) of titanium halide, a Lewis base, anhydrous magnesium or manganese chloride, and an unsaturated additive, (B) trihydrocarbylaluminum and, optionally, a Lewis base, and optionally (C) a dihydrocarbyl aluminum halide.
Butene-1 is polymerized employing a catalyst system comprising (A) a component formed by intensive mixing (milling) of titanium halide, a Lewis base, anhydrous magnesium or manganese chloride, and an unsaturated additive (B) a trihydrocarbylaluminum, a further Lewis base and a dialkylaluminum halide.
Polymerization catalyst and process for polymerizing alpha-olefins
申请人:PHILLIPS PETROLEUM COMPANY
公开号:EP0012397A1
公开(公告)日:1980-06-25
Alpha-olefins are polymerized employing a catalyst which forms on mixing a catalyst component A formed by milling together a magnesium halide or manganous halide with selected catalyst adjuvants followed by treatment of the resulting milled product with a halogenated tetravalent titanium compound and combining the product thus formed with a cocatalyst component B comprising at least one of an organoaluminum compound and an organoaluminum monohalide with or without an aromatic ester as a part of the cocatalyst system.
α-烯烃采用一种催化剂进行聚合,这种催化剂是通过将卤化镁或卤化锰与选定的催化剂辅助剂混合研磨形成催化剂组分 A,然后用卤代四价钛化合物对研磨产物进行处理,并将由此形成的产物与由有机铝化合物和有机铝单卤化物中的至少一种组成的助催化剂组分 B 相结合而形成的,助催化剂体系中可以有芳香族酯,也可以没有芳香族酯。