Part II. Addition of isocyanic acid to some alkenes and alkadienes
In the search for ecologically harmless methods for syntheses of organic diisocyanates, the variants described in the literature of the HNCO addition to isopropenyl derivatives of benzene and to several other olefin es have been presented. On the basis of the results of own research work and experimental results of American authors, possibilities of utilization for this aim also of some components of turpentine, especially α- or β-pinene have been pointed out. Thus, γ-methane 1,8-diisocyanate prepared from these compounds is a valuable intermediate product for the synthesis of special types of polyurethanes. Attention has been called to the necessity of an intensiva research in Poland on conversion of aromatic monoisocyanates into their Dior polyfunctional analogues, by condensation of corresponding monocarbamates with HCHO. The newest method for conversion of primary diamines by means of HNCO into corresponding diisocyanates without use of phosgene has been positively evaluated.
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