Ary-Branched, Carbamate Connectivity

Kumar and Ramakrishnan demonstrated that the thermal decomposition (107 °C) of 3,5-dihydroxybenzoyl azide gave rise to the labile 3,5-dihydroxyphenylisocyanate, which afforded (at 110 °C in dry DMSO with a catalytic amount of dibutyltin dilaurate) the polyurethane in 95 % yield. The polydispersity is greater than two, which is indicative of the poor mobility of the monomers the polymers were soluble in aqueous base, confirming the presence of free phenolic termini. 

Kakimoto et al. 43h have reported the preparation of hyperbranched engineering plastic, poly(phenylene sulfide)(PPS) dendrimers via the polymerization of methyl 3,5-bis-(phenylthio)-phenyl sulfoxide. The degree of polymerization and weight average molecular weight were determined to be 80 and 25,700 amu, respectively T% values were determined to increase (102 to 124 °C) proportionately relative to molecular weight. 

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