Different alkyl/aryl 7-hydroxy-8-coumarinyl ketones were converted to 7-O-allyl and 7-O- cyclohexenyl ethers and the study of hitherto unreported sigmatropic rearrangement on 7-O- allyl and 7-O-cyclohex-2'-ene-1'-ylcoumarinyl ketones prepared is accounted herein. The rearrangement yielded alkyl/aryl 6-allyl-7-hydroxy-8-coumarinyl ketones 3 and alkyl/aryl 6- cyclohex-2'-en-1'-yl-7-hydroxy-8-coumarinyl ketones 7 as the major products. Interestingly ...
