Cobalt (II) complexes of porphyrins are effective catalysts for intramolecular nitrene insertion of C—H bonds with arylsulfonyl azides. The cobalt-catalyzed process can proceed efficiently under mild and neutral conditions in low catalyst loading without the need of other reagents or additives, generating nitrogen gas as the only byproduct. Using the simple tetraphenylporphyrin (TPP) as the ligand, the cobalt-catalyzed intramolecular amidation can be applied to primary, secondary, and tertiary C—H bonds and suitable for a broad range of arylsulfonyl azides, leading to the syntheses of various benzosultam derivatives in excellent yields
Certain substituted cyanobenzenesulfonamides, nitrobenzenesulfonamides, trifluoromethylbenzenesulfonamides, halobenzenesulfonamides, and cyanomethylbenzenesulfonamides are effective preemergence and postemergence herbicides, which may be used for selective weed control in certain crops.
Hydrogen reduction of sulfonyl chlorides to thiols
申请人:——
公开号:US20030055290A1
公开(公告)日:2003-03-20
This invention relates to a process for the production of an aryl thiol, which comprises hydrogenating an aryl sulfonyl chloride in a solvent in the presence of a palladium catalyst and a base whose conjugate acid has a pK
a
of about 2 or greater, wherein the base is selected from the group consisting of ionic bases soluble in water and tertiary amines soluble in the solvent, the tertiary amines not having a methyl group attached to the amine nitrogen.
本发明涉及一种生产芳基硫醇的工艺,该工艺包括在溶剂中,在钯催化剂和共轭酸 pK
a
约为 2 或更大的碱,其中碱选自由可溶于水的离子碱和可溶于溶剂的叔胺组成的组,叔胺的胺氮上不附有甲基。
Polyisopropylbenzenes. V. Acetylation<sup>1</sup>
作者:A. Newton
DOI:10.1021/ja01252a062
日期:1943.12
HYDROGEN REDUCTION OF SULFONYL CHLORIDES TO THIOLS