Stable Biscarbodiimides

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Abstract
The dehydrosulfurization of bisthioureas containing at least one aromatic residue results in the corresponding biscarbodiimides. Biscarbodiimides with bulky groups, such as t-butyl and 2,6-xylyl, can be isolated without any polymerization and disproportionation; the steric hindrance of the bulky groups makes such isolation possible. Polymerization and disproportionation interrupt the isolation of biscarbodiimides with less bulky groups. Despite their nonpolymerizability, they give rise to the other known addition reaction of aromatic carbodiimides.