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B. Charleux, A. Rives, T. P. Vairon

The reaction of trans 1,3-diphenyl-l-butene with triflic acid: a kinetic study using the stopped-flow technique

Polimery 1997, No 1, 24


DOI: dx.doi.org/10.14314/polimery.1997.024


Summary

The reaction of trans 1,3-diphenyl-l-butene (D), a trans ethylenic dimer of styrene, with trifluoromethanesulfonic acid in dichloromethane has beenstudied over -67°C to 20°C by the stopped-flow technique with real time UV-VIS spectroscopic detection. The main product of the reaction was the indanic dimer of D (DI). A transient absorption at 340 nm has been assigned to1,3-diphenylbutylium (D+), a model for the polystyryl cation. Absorptions at 349 nm and 505 nm were also observed and assigned to the allyliccation, l,3-diphenyl-3-butenylium (Di+), resulting fromhydride abstraction from D. This species was very stable at temperatures lowerthan -30°C. A general mechanism was proposed based on the kinetic study of there actions involved.

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