Cationic polymerization CF3SO3H initiation

Iwasaki T, Nagaki A, Yoshida J (2007) Microsystem controlled cationic polymerization of vinyl ethers initiated by CF3SO3H. Chem Commun 1263-1265... 

Iwasaki T, Yoshida J (2007) CF3SO3H initiated cationic polymerization of diisopropenyl-baizenes in macrobatch and nricroflow systems. Macromol Rapid Commun 28 1219-1224... 

The cyclopolymerization of the title compound (St-Cj-St), C3 cyclopolymerization, is reviewed. The polymerization has the similar behavior to the fluorescence emission of 1,3-diphenylpropane and its derivatives (n=3 rule or C3 rule). The monomer and its derivatives were prepared by the convenient method from the corresponding a-phenethylalcohol derivatives, using dimethyl sulfoxide-ZnCl2 CCl3COOH system. St-C3 St gave a cyclopolymer only by cationic initiators, and the presence of cyclized units in the main chain was elucidated by several spectroscopic analyses and also by the isolation of cyclocodimers obtained from the reaction of the monomer with styrene in the presence of the catalytic amount of CF3SO3H. 

The first example of the controlled living cationic ROP of the five-membered cyclic dithiocarbonate (79) based on the neighboring group participation initiated with CF3SO3H or CF3SO3CH3 has also been demonstrated (234). This new concept of living polymerization may be applied to the design of well-defined novel functional polymers. 

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