Synthesis And Investigation Of 2-(Hydroxybenzylidene)-5-Methylcyclohexan-1-One

The 2-(2-hydroxybenzylidene)-5-methylcyclohexan-l-one (BMC) was synthetized in basic solution and the structure was confirmed by single crystal X-ray diffraction and H-1 NMR. BMC crystallizes in the monoclinic space group P2(1)/c, with cell dimensions alpha = 6.1146(14), b = 10.9437(15), c = 17.529(7) angstrom, beta = 94.09(3)degrees. The BMC behaviour was investigated at different pH values. Upon a pH jump from 7 to 1, BMC undergoes cyclisation and forms xanthylium cation (MTX) with a maximum absorption band at 515 nm. In the case of reverse pH jump, the BMC converted instantaneously into deprotonated BMC- with the maximum absorption at 390 nm.