Regiospecfically substituted 1-methyl- and 2-methylnaphthalenes. 5-met
hyl- and 6-methyl-1,2,3,4-tetrahydroanthracenes have been synthesized
in good yields through 1,2-addition of the corresponding alpha-lithio-
o-or m-xylenes onto alpha-oxoketene dithioacetals or their dihydro de
rivatives followed by cyclodehydration of the resulting carbinols in !
he presence of borontrifluoride etherate. Copyright (C) 1996 Published
by Elsevier Science Ltd.