Photochemical E-Z isomerization of meta-terphenyl-protected phosphaalkenes and structural characterizations

Vittal B. Gudimetla, Arnold L. Rheingold, John L. Payton, Huo Lei Peng, M. Cather Simpson, John D. Protasiewicz

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


A series of phosphaalkenes, E-ArP=C(H)Ar′ (Ar = 2,6-Mes 2C6H3, Ar′ = Ph (1a); Ar = 2,6-Mes 2C6H3, Ar′ = p-C6H 4Br (2a); Ar = 4-Br-2,6-Mes2C6H2, Ar′ = Ph (3a); Ar = 4-Br-2,6-Mes2C6H2, Ar′ = p-C6H4Br (4a)) have been prepared by phospha-Wittig reactions and characterized. Exposure of these materials either to room light over an extended period of time (days) or to UV light (hours) produced equilibrium mixtures of the E and Z isomers (1b-4b) as indicated by 1H and 31P NMR spectroscopy. The structures of compounds 4a and 4b were determined by single-crystal X-ray diffraction methods. Variable-temperature 1H NMR studies of 4b indicate hindered rotation about the P-CAr bond, with ΔH = 13.8 kcal/mol and ΔS = 1.3 eu. The electronic structures of E- and Z-PhP= C(H)Ph have been examined using density functional theory.

Original languageEnglish (US)
Pages (from-to)4895-4901
Number of pages7
JournalInorganic Chemistry
Issue number13
StatePublished - Jun 26 2006
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry


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