3-Substituted coumarins are formed in 37–63% yields by the reaction of 2-(acyloxy)arylaldehydes with the TiC4/R3N reagent system. The structure of the compound 2c was determined by single crystal X-ray analysis. ... Keywords: titanium tetrachloride, tertiary amines, 2-(acyloxy)arylaldehydes, coumarins ... The titanium reagents have been widely used in several important C–C bond forming reactions1 namely aldol additions2 eg Mukaiyama aldol ...
