Abstract
AbstractProducts formed on pyrolysis of malonic ester‐blocked aliphatic isocyanates depend on the enolizability of the blocked isocyanate. Previous work reported that diethyl malonate‐blocked aliphatic isocyanates on pyrolysis yield predominantly “abnormal” products rather than the expected isocyanates. It has now been shown that this behavior results from the reactions of the enol forms. A nonenolizable diethyl methylmalonate‐blocked isocyanate has been synthesized. On pyrolysis essentially quantitative conversion to isocyanate and diethyl methylmalonate occurs. Significant differences in reactivity with amines and alcohols also result from the difference in enolizability.
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