An efficient and convenient method for preparation of 2,2-disbustituted and 2-monosubstituted 1,3-benzodioxoles from ketones and aldehydes with catechol catalysed by ZrO_2/SO_4~(2-)

摘要

The title compounds have been synthesised by reaction of catechol with ketones and aldehydes catalysed by ZrO_2/SO_4~(2-) solid superacid in high yields. Ketones gave better yields than aldehydes.