Olefin Reactivities toward the Ph-P-W(CO)5 Phosphinidene

Academic Article

Abstract

  • Phosphinidene complex Ph-P-W(CO) (2), generated from the appropriate phosphanorbornadiene complex 1, reacts with olefins to give the expected phosphiranes. The relative olefin reactivity toward 2 in toluene at 55 °C is tetramethylethylene (0.2), trimethylethylene (0.8), isobutylene (2-4), cis-2-butene (1.0), trans-2-butene (0.3), and 1-butene (0.2). The modest stereoselectivity of the phosphinidene addition reactions is reflected in the synlanti-phosphirane product ratios of several olefins and results form opposing steric and electronic influences. For cis-2-butene the synlanti ratio is 0.25 and the X-ray structure of the anit-isomer was determined. The surprising lack of olefin selectivity is compared with the olefin reactivities of various carbenes and particularly that of isopropylidene. The phosphinidene-olefin additions behave analogously to the carbene cyclopropanations and suggest the importance of entropie factors in the thermodynamically controlled reactions. © 1994, American Chemical Society. All rights reserved. 5
  • Authors

    Digital Object Identifier (doi)

    Pubmed Id

  • 15584861
  • Author List

  • Hung JT; Yang SW; Chand P; Gray GM; Lammertsma K
  • Start Page

  • 10966
  • End Page

  • 10971
  • Volume

  • 116
  • Issue

  • 24