title: Borata-alkene derivatives conveniently made by frustrated Lewis pair chemistry.
abstract: Two (aryl)PXY starting materials (aryl = mesityl or 2,4,6-triisopropylphenyl; X,Y = Cl, Br) were reacted with lithiated conjugated enynes (derived from 2-methylbutenyne or 1-ethynylcyclohexene) to yield the respective (aryl)bis(enynyl)phosphanes. Their reaction with HB(C6F5)2 gave the heterocyclic five-membered zwitterionic borata-diene compounds containing the aryl group and one unchanged enynyl substituent at phosphorus. The borata-alkene products were thought to arise from a two step process of regioselective alkyne hydroboration followed by an internal phosphane attack on the boryldiene unit. Three examples of the ring-closed borata-alkene type products were characterized by X-ray diffraction.
authors.affiliation: Organisch-Chemisches Institut, Universität Münster, Corrensstraße 40, 48149 Münster, Germany. erker@uni-muenster.de.
authors.forename: Juri
authors.initials: J
authors.lastname: Möbus
authors.forename: Gerald
authors.initials: G
authors.lastname: Kehr
authors.forename: Constantin G
authors.initials: CG
authors.lastname: Daniliuc
authors.forename: Roland
authors.initials: R
authors.lastname: Fröhlich
authors.forename: Gerhard
authors.initials: G
authors.lastname: Erker