Ethyl chloride oxetane

Rose also derived heats of polymerization. The values he obtained were 20.0 kcalmole for polymerization in methyl chloride solution at —20°C and 19.3 kcalmole" for polymerization in a mixture of ethyl chloride and methyl chloride at —9°C. It is at once a bit unfortunate that this elegant piece of work was carried out as early as 1956 before catalysts leading to less complicated kinetics were discovered, and a tribute to Rose s careful work that he was able to sort out the many complications involved. No other detailed kinetic study of the polymerization of oxetane was made until many years later. In 1971 Saegusa et al. [52], reported a kinetic study of the polymerization of oxacyclobutane initiated by a BF3—THF complex. 

Rose [50] also investigated the polymerization of 2-methyl oxacyclo-butane and of 3,3-dimethyloxacyclobutane enough to learn that they followed a course analogous to that of the parent compound. He also found a heat of polymerization at —9°C of 16.1 kcalmole for 3,3-dimethyloxacyclobutane polymerized in a mixture of ethyl chloride and methyl chloride. Again Saegusa et al. [54] have extended the work to clarify the effect on the propagation rate of a methyl substituent at the 3 position of oxetane. They also examined the solvent effects of CH2CI2 and methylcyclohexane for these two substituted monomers. 

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