Acta Cryst. (2013). C69, 1157-1163 [ doi:10.1107/S0108270113022981 ]
Synopsis: The conformations of the anilino(phenyl)methyl groups are similar in four related diethyl [(arylamino)(4-ethynylphenyl)methyl]phosphonates. In each compound, the P-C bond has an approximate staggered conformation, with the aniline and ethynylphenyl groups in gauche positions with respect to the P=O double bond, and the two six-membered rings are almost perpendicular.
Formula: C19H21BrNO3P, C23H31ClNO3PSi, C22H29FNO3PSi and C23H24NO3P
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