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Urea derivatives Urea derivatives Q 0640Specificity of the Reaction of 1,1-Dimethylhydrazine with Phenyl Isocyanate. -The reaction of phenyl isocyanate with a large excess of 1,1-dimethylhydrazine gives 4-phenylsemicarbazide (III) as the major product. At other reactant ratios, biuret-like structures such as (IV) and (V) are formed. -(SAVEL'EV, Y. V.; KHRANOVSKII, V. A.; VESELOV, V. Y.; GREKOV, A. P.; SAVEL'EVA, O. A.; Russ.

Nach bekannten Verfahren werden (ohne experimentelle Angaben) aus dem Dibutylphosphit (I) und den Grignardverbindungen (II) die Phosphinoxide (III) dargestellt und weiter entweder mit Phosphorpentachloridoder Thionylchlorid oder Gemischen aus Phosphorpentachlorid.

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