Cesium acetate was found to be the best catalyst for the synthesis of 3-benzylidenephthalide from phthalic anhydride and phenylacetic acid. Reasonable to good yields of different 3-arylmethylenephthalides were isolated from the microwaveGabrielsynthesis, even when phenylthio- and 2-(3-)thienyl- acetic acids were used as the starting material.
Ring-chain tautomerism of 1-hydroxyphthalans. An examination of structural effects
作者:James G. Smith、Peter W. Dibble
DOI:10.1016/s0040-4020(01)91115-9
日期:1984.1
nzaldehyde exist in a tautomeric equilibrium. The effects of molecular structure on this equilibrium was examined using various derivatives of dihydroisobenzofuranol. Two effects of this molecular modification were identified: (i) 1-arylmethyl substituents favored the ring-opened tautomer if steric effects arose in the ring closed form and (ii) extending the conjugated system of the dihydroisobenzofuran