... The Journal of Organic ... J. Org. ... R = NO 2 , CHO, Cl, Br, OMe, CN, NHCOMe, SPh, OCOPh, or OH, the dominant tautomer is that R lies on the isolated double bond, while for R = CH CH 2 , CH 2 OH, NH 2 , Me, CH(Me) 2 , or (CH 2 ) 3 Me, the major tautomer is one where R lies on ...