A pesticidal compound of formula I: ##STR1## in which formula: either R.sup.1 is hydrogen and R.sup.2 represents a cyclopropyl group or R.sup.1 and R.sup.2 each represent an alkyl group, which alkyl groups may be the same or different; Ar.sub.A represents an optionally substituted phenyl or naphthyl group; Ar.sub.B represents a phenoxy, phenyl, benzyl or benzoyl-substituted phenyl group which is optionally further substituted; the configuration of the groups Ar.sub.A --CR.sup.1 R.sup.2 and --CH.sub.2 Ar.sub.B about the double bond being mutually trans. Preferably Ar.sub.A is a substituted phenyl group; more preferably being substituted at the 4-(para) position by halogen, alkoxy or haloalkyl. Further provided is a process for the preparation of a pesticidal compound of formula I in which a compound comprising a moiety ##STR2## and a compound comprising a moiety Ar.sub.B -- are reacted together forming a link --CH.dbd.C(F)CH.sub.2 -- between ##STR3## and Ar.sub.B in the compound of formula I.
Catalyst‐Controlled Divergent Generations and Transformations of <i>α</i>‐Carbonyl Cations from Alkynes**
作者:Junrui Zhou、Weilin Wang、Fenfang Zuo、Shupeng Liu、Pathan Mosim Amin、Kangbao Zhong、Ruopeng Bai、Youliang Wang
DOI:10.1002/anie.202302545
日期:2023.12.4
Catalyst-controlled divergent generations of α-carbonyl cations from single alkyne functionalities and their divergent further transformations have been established. Broad spectrum of alkynes including aryl alkyne, ynamide, alkynyl ether, and alkynyl sulfide could be utilized. The intermediacy of α-carbonyl cations via the N−O bond cleavage was supported by DFT calculations in both catalytic systems