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Abstract
Symmetric organic compounds containing 1-phosphoryl-3-imino groups were prepared by a two phase reaction between the corresponding dialkylphosphite and alkanediyl diisothiourea. The X-ray structure analysis showed that the diisopropylphosphoryl ethylenediisothiourea IIacrystallized in the orthorhombic space group Pbca with the cell dimensions a=16.660(3) Å, b=8.910(2) Å, c=17.457(3) Å, z=4, at−100°C. The coordination around the phosphorus atom in the molecule is distorted tetrahedrally. The molecule has moieties slightly out of plane around 0=P─N─C─N with strong inter-molecular hydrogen bonds.