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11.
A new and simple synthesis of thiolester by reaction of the mixed anhydrides1 with alkalisalts of mercaptanes and thiophenolates is presented. 相似文献
12.
Functionalized 3-hydroxymaleic anhydrides were prepared by cyclization of 1,1-bis(trimethylsilyloxy)ketene acetals with oxalyl chloride. 相似文献
13.
Massoud S. Stephan Antonius J. J. M. Teunissen Gerard K. M. Verzijl Johannes G. de Vries 《Angewandte Chemie (International ed. in English)》1998,37(5):662-664
Environmentally benign and economical production of arylated olefins can be achieved by a new variant of the Heck reaction in which no halogen salts are formed. The trick is the use of aromatic carboxylic anhydrides 1 as arylating agents. With halide-activated palladium chloride as catalyst, which requires no phosphane ligands, the olefins 2 can be prepared according to Equation (a) in good yields. 相似文献
14.
Access to Trifluoromethylketones from Alkyl Bromides and Trifluoroacetic Anhydride by Photocatalysis
Hai-Wu Du Dr. Yi-Dan Du Xian-Wang Zeng Prof. Dr. Wei Shu 《Angewandte Chemie (International ed. in English)》2023,62(38):e202308732
Aliphatic trifluoromethyl ketones are a type of unique fluorine-containing subunit which play a significant role in altering the physical and biological properties of molecules. Catalytic methods to provide direct access to aliphatic trifluoromethyl ketones are highly desirable yet remain underdeveloped, partially owing to the high reactivity and instability of trifluoroacetyl radical. Herein, we report a photocatalytic synthesis of trifluoromethyl ketones from alkyl bromides with trifluoroacetic anhydride. The reaction features dual visible-light and halogen-atom-transfer catalysis, followed by an enabling radical-radical cross-coupling of an alkyl radical with a stabilized trifluoromethyl radical. The reaction provides straightforward access to aliphatic trifluoromethyl ketones from readily available and cost-effective alkyl halides and trifluoroacetic anhydride (TFAA). 相似文献