We recently demonstrated that simple iminium salts generated in aqueous medium are sufficiently reactive to undergo [4+ 21 cyclocondensation with unactivated dienes (cf. eq l). I In connection with an ongoing project it was of interest to determine if iminium ion chemistry could be extended to allylsilanes in water? The well-documented reactivity of allylsilanes toward electrophiles3” suggested that treatment of allyltrimethylsilane with an N- ...