The crystal and molecular structure of N-diethoxyphosphorylformamidine (2) has been determined. P2,/n, a = 8.343(1), b = 9.249(1), c = 12.413(1) A, p = 102.06 (1)"; V = 937(1) Final R, = 0.052 for 1705 reflections with I > 344 and 113 parameters. Molecular parameters indicate strongelectron-donating effect of the amidine substituent, resulting in high P-N bond order and small difference between the two C-N bond distances. The geometry of the molecule is different from that observed for phosphoric-carboxylicimides: the O=P-N=C-NH, system is almost planar with the phosphoryl oxygen in short contact with the spz carbon atom.
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