title: Alternative Synthesis and Structures ofC-monoacetylenic Phosphaalkenes.
abstract: An alternative synthesis ofC-monoacetylenic phosphaalkenestrans-Mes*P=C(Me)(C≡CR) (Mes* = 2, 4, 6-tBu3Ph, R = Ph, SiMe3) fromC-bromophosphaalkenescis-Mes*P=C(Me)Br using standard Sonogashira coupling conditions is described. Crystallographic studies confirmcis-transisomerization of the P=C double bond during Pd-catalyzed cross coupling, leading exclusively totrans-acetylenic phosphaalkenes. Crystallographic studies of all synthesized compounds reveal the extend of π-conjugation over the acetylene and P=C π-systems.
authors.affiliation: Department of Chemistry-Ångström Laboratory, Uppsala University Box 523, SE-751 20, Uppsala, Sweden.
authors.forename: Andreas
authors.initials: A
authors.lastname: Orthaber
authors.affiliation: Department of Chemistry-Ångström Laboratory, Uppsala University Box 523, SE-751 20, Uppsala, Sweden.
authors.forename: Elisabet
authors.initials: E
authors.lastname: Öberg
authors.affiliation: Department of Chemistry-Ångström Laboratory, Uppsala University Box 523, SE-751 20, Uppsala, Sweden.
authors.forename: Reuben T
authors.initials: RT
authors.lastname: Jane
authors.affiliation: Department of Chemistry-Ångström Laboratory, Uppsala University Box 523, SE-751 20, Uppsala, Sweden.
authors.forename: Sascha
authors.initials: S
authors.lastname: Ott
keywords: Hay coupling; Phosphaalkenes; Sonogashira coupling; X-ray crystallography