On the exclusion of radical species in the ligand coupling reactions with pentavalent triarylbismuth derivatives
作者:Sbastien Combes、Jean-Pierre Finet
DOI:10.1016/s0040-4020(98)01148-x
日期:1999.3
The presence of aryl radical species in the course of arylationreactions with tri and pentavalent organobismuth compounds has been studied by the use of an internal-trap containing reagent: tris(2-allyloxyphenyl)bismuth and its diacetate. The intervention of radical species can be excluded in C- and O-arylation under basic conditions as well as in copper catalyzed O- and N-arylation, as cyclized products
Aromatic urea derivatives and their use as herbicide
申请人:Mitsui Petrochemical Industries, Ltd.
公开号:US04838924A1
公开(公告)日:1989-06-13
This invention relates to novel compounds of formula [I], a process for their production, and their use as a herbicide. ##STR1## wherein A represents the bond ##STR2## in which X is a hydrogen atom, a chlorine atom, a nitro group or a trifluoromethyl group; B represents a hydrogen atom, a methyl group or a methoxy group; and Ar represents one member selected from the group consisting of ##STR3## in which R.sup.1 to R.sup.38, are as defined hereinafter.