Quenching of the excited singlet penta-1,3-dienes by Me3SnH: evidence against the allylmethylene configuration of the relaxed S1 state
Abstract
The 1,4 concerted addition of Me3SnH to the singlet excited penta-1,3-dienes yields cis- and trans- adducts according to a stereochemistry which is incompatible with an allylmethylene relaxed configuration and suggests a doubly state.