All articles of this category The Diels-Alder reaction of methyl 2-pyrone-5-carboxylate and bis(trimethylsilyl)acetylene gave methyl 3,4-bis(trimethylsilyl)-benzoate which was transformed into [5-(methoxycarbonyl)-2-(trimethylsilyl)phenyl](phenyl)iodonium triflate by the reaction with a hypervalent iodine reagent PhI(OAc) 2 /TfOH. The generation and trapping reactions of 4-(methoxycarbonyl)-1,2-didehydrobenzene were successfully conducted by the reaction of the iodonium triflate with Bu 4 NF. hypervalent iodine compound - benzyne - Diels-Alder reaction - methyl 2-pyrone-5-carboxylate - bis(trimethylsilyl)acetylene
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Kitamura et al. (1999) studied this question.