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t-2-tert-Butyl-t-3-phenyl-r-1-methylthiiranium 1 isomerizes into the more stable (32.3 kJ mol–1) t-2-tert-butyl-c-3-phenyl-r-1-methylthiiranium 2 in a complete and irreversible process (monitored by proton NMR at –30 °C) via an open benzylic carbenium ion.
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Pasquato et al. (1999) studied this question.
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