Esters of .alpha.-hydroperoxy-bis-p-halo-phenylacetic acids
申请人:Yeda Research & Development Co., Ltd.
公开号:US04066785A1
公开(公告)日:1978-01-03
New esters of the .alpha.-hydroperoxy-bis-p-chloro-(or-bromo)-phenylacetic acids useful as acaricides, process for the preparation of same and compositions containing such materials.
新的α-过氧基双对氯(或溴)苯乙酸酯类化合物,可用作杀螨剂,制备方法及含有这类物质的组合物。
Boron‐Catalyzed C−C Functionalization of Allyl Alcohols
talyzed C−C bond functionalization of arylallyl alcohols using donor‐acceptor carbenes is presented. The allylic hydroxyl group is found to assist the product formation by neighboring group participation providing a clue towards mechanistic understanding. This method can also be employed to effect homologation of allylalcohols to homoallyl alcohols. Overall, this metal‐free transformation presents
functionalizations of more distal C-H bonds in hydrocinnamoyl ketones, Weinreb amides, and biphenyl Weinreb amides. Mechanistically, the coordination of these carbonyl groups and the bisdentate amino acid ligand with Pd(II) centers provides further evidence for our early hypothesis that the carbonyl groups of the potassium carboxylate are responsible for the directed C-H activation of carboxylicacids.
The enantioselective carbene insertion into N–H bonds of anilines has been realized by cooperativecatalysis of ruthenium complexes and chiralphosphoricacids, providing the expected α-aryl glycines in moderate to good yields with high enantioselectivity. Typically, by slightly modifying the reaction conditions, this approach allows the N–H bond insertion reaction to be effective for both α-aryl and
This work describes acylation reactions facilitated by a type of heterocycle‐based acyl transfer agent, 2‐acyloxypyridazinone. Reactions of 2‐acyloxypyridazinone with carboxylic acids yield mixed carbonic anhydride intermediates, which are reactive and could be coupled with a wide range of substrates including acids, amines, alcohols, and thiols. The wide substrate scope, ease of operation (no additive