Inter-and intra-molecular photocycloaddition of enol ethers to naphthalene
作者:Andrew Gilbert、Peter Heath、Annoula Kashoulis-Koupparis、Graham C. R. Ellis-Davies、Susan M. Firth
DOI:10.1039/p19880000031
日期:——
intermolecular cyanonaphthalene–enol ether photoreactions. 2,3-Dihydrofuran undergoes specific ‘head to head’endo photoaddition to naphthalene but in contrast the major adducts from 2,3-dihydrofuran and this arene have ‘head to head’exo and ‘head to tail’endo structures. The adduct (18) undergoes a facile 1,3-shift to yield the (4π+ 2π)endo adduct (19). The reactivities of the bichromophores and the regiochemistries