(E)-1-(3,4-dihydro-2H-pyran-6-yl)-3-(furan-2-yl)-2-methylprop-2-en-1-one 在
fluorotris(pentafluorophenyl)phosphonium tetrakis(pentafluorophenyl)borate 作用下,
反应 0.5h,
生成 5-(furan-2-yl)-6-methyl-3,4,5,6-tetrahydrocyclopentan[b]pyran-7(2H)-one 、 5-(furan-2-yl)-6-methyl-3,4,5,6-tetrahydrocyclopentan[b]pyran-7(2H)-one