Add time:08/26/2019 Source:sciencedirect.com
The rates and extents of polymerization of 1,2-epoxypropane and 1,2-EPOXYBUTANE (cas 106-88-7), induced by photolysis of dilute concentrations of salts of 2,5-diethoxy-4-tolylthiobenzenediazonium ion with various Lewis acids (SbF−6, PF−6, BF−4 etc.) have been determined by viscosity, 1H n.m.r. and polymer isolation methods. A clear dependence exists of the degree of conversion on the anion: thus SbF−6 salt yields up to 100% high polymer, PF−6 salt yields c. 20% high polymer, while BF−4 salt yields small conversions (2%, but increasing to 15–18% at high initiator concentrations) which consists almost entirely of oligomers, mainly the cyclic tetramer.
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