Insecticidal compounds of the formula: ##STR1## in which A is chloro and B is hydrogen or A and B are both fluoro, X is oxygen or sulfur and one of R.sup.1 and R.sup.2 is or includes an optionally substituted 5-membered heteroaryl ring, their method for preparation and formulation, insecticidal compositions thereof, and their use to control insects, are disclosed and exemplified.
[9, 9]-Sigmatropic shifts in acid-catalyzed benzidine-type rearrangements
作者:Hee Jung Park、Dong Hun Jung、Koon Ha Park
DOI:10.1007/s11164-018-3579-6
日期:2018.12
prepared from corresponding azo precursors, was used in the acid-catalyzed benzidinerearrangements. Both rearrangement and disproportionation occurred and product structures were characterized by spectroscopic data such as NMR, MS, and with CHN analysis. We confirm the largest [9, 9]-sigmatropic benzidine-type rearrangement in each case as a prominent pathway accompanied by disproportionation.