Cycloalkenobenzofurans 5 and 7 are prepared in one operation from hydr
oquinone 1 and cycloalkenediol 2 involving a sequence of acid-catalyze
d formation of ether 3, 1,3- and/or 3,3-rearrangementts, and acid-cata
lyzed intramolecular cyclization of 4 and 6 generated as intermediates
.