Abstract ϵ‐Isocyanatocaproyl chloride, β‐isocyanatopropionyl chloride, isocyanatoacetyl chloride, and p ‐isocyanatobenzoyl chloride were prepared from the corresponding amino acids by reaction with phosgene and hydrogen cloride. The isocyanatocarboxylic acid chlorides have two different highly reactive functions, isocyanato‐ and chlorocarbonyl groups, and gave polyamide‐ureas by polycondensation‐addition with diamines. The polyamide‐ureas obtained were high molecular, film‐forming polymers, except those derived from isocyanatoacetyl chloride.
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Hayashi et al. (1965) studied this question.
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