Isobutylene with hexafluoroacetone

Reaction of Isobutylene with Hexafluoroacetone. Conversion curves of the reaction product appear in Figure 14. The shape of the conversion curve at 0°C is different from curves at — 35°C and — 78°C. The effect of initial monomer concentration on the reaction is shown in Figure 15. 

The azomethine imine 145 from isobutylene and hexafluoroacetone azine, with DMAD, leads to a stable 1 1 adduct (146) in 90% yield.132,133... 

Radiation induced copolymerization of hexafluoroacetone xcith a-olefins has been done over a broad temperature range. From these experiments, it was confirmed that ethylene can be copolymerized below its critical temperature to give an alternating copolymer. A radical mechanism is involved at relatively high temperatures below —10°C, the mechanism has been confirmed to be ionic and may be cationic. Propylene can be copolymerized in a way similar to that of ethylene however, the rate of copolymerization was much slower. Isobutylene did not copolymerize with hexafluoroacetone at 0°C. A 1 2 adduct compound was obtained as the main product. At low temperatures, copolymerization proceeds to some extent. 

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