Abstract
Abstract In aqueous ethanol 1-aryl-5,7-di-t-butyl-2-(o-methoxyphenyl)spiro[2.5]octa-1,4,7-trien-6-one 4 changed to 2-aryl-3-(3′,5′-di-t-butyl-4′-hydroxyphenyl)benzofuran 5 in a more than 90% yield. The selective formation of 5 is ascribed to a neighbouring group participation of the ortho-methoxyl group to an incipient vinyl cation.
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