Some α-haloketones react with furan in methanolic solution in the presence of base to form the 3-oxo-8-oxabicyclo[3.2.1]oct-6-enes (), the products derived from a [4+3] cycloaddition of an allylium intermediate ( or ).
在碱的存在下,一些α-卤代酮与
呋喃在
甲醇溶液中反应,形成3-oxo-8-oxabicyclocyclo [3.2.1] oct-6-enes(),其产物是由[4 + 3]环加成衍生而来的。烯丙基中间体(或)。