Acta Crystallographica Section C

Crystal Structure Communications

Volume 63, Part 4 (April 2007)

organic compounds

sq3064 scheme

Acta Cryst. (2007). C63, o267-o270 [ doi:10.1107/S0108270107010542 ]

Differences in the crystal structures of two dialkyl diester triphenylphosphonium ylids

F. Castañeda, C. Jullian, C. A. Bunton, M. T. Garland and R. Baggio

Abstract: Hydrogen bonding and crystal packing play major roles in determining the conformations of ethyl methyl 2-(triphenylphosphoranylidene)malonate, Ph₃P=C(CO₂CH₃)CO₂CH₂CH₃ or C₂₄H₂₃O₄P, (I), and dimethyl 2-(triphenylphosphoranylidene)malonate, Ph₃P=C(CO₂CH₃)₂ or C₂₃H₂₁O₄P, (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.

Formula: C₂₄H₂₃O₄P and C₂₃H₂₁O₄P


	Structure factor file (CIF format) (231.1 kbytes) [ doi:10.1107/S0108270107010542/sq3064Isup2.hkl ] Contains datablock I

	Structure factor file (CIF format) (438.9 kbytes) [ doi:10.1107/S0108270107010542/sq3064IIsup3.hkl ] Contains datablock II

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