Formation of a Chelating σ-Ally I by the Intramolecular Activation of a Cyclopropylphosphine. Synthesis and Crystal Structure of [PdCI(P(t-Bu)2CH=C(CH3)CH2)]2

Wiley J. Youngs, James Mahood, Barbara L. Simms, Paul N. Swepston, James A Ibers*, Shang Maoyu, Huang Jinling, Lu Jiaxi

*Corresponding author for this work

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Abstract

The cyclopropyl-containing phosphine di-tert-butyl(cyclopropylmethyl)phosphine, P(t-Bu2CH2- CHCH2CH2, reacts with PdCl2 to afford trans-PdCl2(P(t-Bu)2CH2CHCH2CH2)2. When this complex is refluxed in MeOCH2CH2OH or glacial acetic acid, a cyclometalated dimer, [PdCl(P(t-Bu)2CH=C- (CH3)CH2)]2, is formed, as deduced from spectroscopic and X-ray analysis. This complex crystallizes in the monoclinic space group C2h5P21/n (a = 7.957 (4) Å, b = 15.780 (2) Å,_c = 12.169 (1) Å, and β = 99.11 (2)) with two molecules per unit cell (imposed crystallographic symmetry, 1). The final agreement indices for 2493 reflections having F0 2 > 3σ(F0 2) are R(F) = 0.031 and Rw(F) = 0.041 (136 variables). The five-atom chelate ring PdP°C=C°C is planar to within 0.011 (4) Å with a bond length pattern of PdP = 2.218 (1) Å, P°C = 1.781 (4) Å, C=C = 1.328 (5) Å, C°C = 1.493 (5) Å, and CPd = 2.016 (3) Å. The Pd-Cl distance trans to the P atom is 2.416 (1) Å and that trans to the C atom is 2.457 (1) Å. In the formation of the complex the chelating σ-allyl group probably results from C-C bond activation of the cyclopropyl group.

Original languageEnglish (US)
Pages (from-to)917-921
Number of pages5
JournalOrganometallics
Volume2
Issue number7
DOIs
StatePublished - Jan 1 1983

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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