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Acta Cryst. (2013). C69, 1157-1163  [ doi:10.1107/S0108270113022981 ]

Four related diethyl [(aryl­amino)­(4-ethynylphen­yl)meth­yl]phosphon­ates

A. Ouahrouch, J. Krim, M. Taourirte, H. B. Lazrek, J. W. Engels and J. W. Bats

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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