title: Stepwise Formation of a 1,3-Butadiene Analogue of Mixed Heavier Group 15 Elements.
abstract: The reaction of the phosphinidene complex [Cp*P{W(CO)5}2] (1 a) with di-tert-butylcarboimidophosphene leads to the P-C cage compound 6 and the Lewis acid-base adduct [Cp*P{W(CO)5}2(CNtBu)] (2 a). In contrast, the arsinidene complex shows a different reactivity. At low temperatures, the arsaphosphene complex [{W(CO)5}{η(2)-(Cp*)As=P(tBu)}{W(CO)5}] (3) is formed. At these temperatures, 3 reacts further with a second equivalent of carboimidophosphene to form [{W(CO)5}{η(2)-{(Cp*)(tBu)P}As=P(tBu)}{W(CO)5}] (5), probably by the insertion of a phosphinidene unit (tBuP) into an As-C bond. In contrast, at room temperature 3 reacts further by a radical-type reaction to form [{(tBu)P=As-As=P(tBu)}{W(CO)5}4] (4). Compound 4 is the first example of a neutral, 1,3-butadiene analogue containing only mixed heavier Group 15 elements. It consists of two P=As double bonds connected by arsenic atoms.
authors.affiliation: Institut für Anorganische Chemie der Universität Regensburg, 93040 Regensburg (Germany).
authors.forename: Michael
authors.initials: M
authors.lastname: Seidl
authors.affiliation: Institut für Anorganische Chemie der Universität Regensburg, 93040 Regensburg (Germany).
authors.forename: Gábor
authors.initials: G
authors.lastname: Balázs
authors.affiliation: Institute of Chemistry, St. Petersburg State University, 7/9 Universitetskaya nab.199034, St. Petersburg (Russia).
authors.forename: Alexey Y
authors.initials: AY
authors.lastname: Timoshkin
authors.affiliation: Institut für Anorganische Chemie der Universität Regensburg, 93040 Regensburg (Germany). manfred.scheer@ur.de.
authors.forename: Manfred
authors.initials: M
authors.lastname: Scheer
keywords: 1,3-butadiene analogues; arsenic; phosphinidene; phosphorus; tungsten