Differences in the crystal structures of two dialkyl diester triphenylphosphonium ylids

Acta Crystallogr C. 2007 Apr;63(Pt 4):o267-70. doi: 10.1107/S0108270107010542. Epub 2007 Mar 31.

Abstract

Hydrogen bonding and crystal packing play major roles in determining the conformations of ethyl methyl 2-(triphenylphosphoranylidene)malonate, Ph(3)P=C(CO(2)CH(3))CO(2)CH(2)CH(3) or C(24)H(23)O(4)P, (I), and dimethyl 2-(triphenylphosphoranylidene)malonate, Ph(3)P=C(CO(2)CH(3))(2) or C(23)H(21)O(4)P, (II). In (I), the acyl O atom of the ethyl ester group is anti to the P atom, while the O atom of the methyl ester group is syn. In (II), the dimethyl diester is a 1:1 mixture of anti-anti and syn-anti conformers.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Crystallography, X-Ray
  • Malonates / chemistry*
  • Molecular Structure
  • Organophosphorus Compounds / chemistry*

Substances

  • Malonates
  • Organophosphorus Compounds