Patent ID: 6670512
Filing Date: 2003-12-30
Classification: C07C

Abstract:
A process for producing a 2,2â€²,2â€³,2â€²â€³ tetra hydroxy tetraphenylethylene comprising:(i) reacting to 2,2â€² di C1-6 alkoxybenzophenone with hydrazine monohydrate to produce a 2,2â€²di-C1-6 alkoxybenzophenone hydrazone; (ii) oxidizing the 2,2â€²di C1-6 alkoxybenzophenone hydrazone in the presence of nickel peroxide and the absence of light at a temperature of not more than 0Â° C. to yield the diazo derivative of 2,2â€²di-C1-6 alkoxybenzophenone hydrazone; (iii) in the absence of light and at a temperature of not more than 25Â° C. decomposing the diazo derivative of 2,2â€²di-C1-6 alkoxybenzophenone hydrazone with anhydrous p-toluene sulphonic acid; to yield the 2,2â€²,2â€³,2â€²â€³ tetra C1-6 alkoxy tetrapenyl ethylene; and (iv) dealkylating the resulting 2,2â€²,2â€³,2â€²â€³ tetra C1-6 alkoxy tetraphenyl ethylene to form the 2,2â€²,2â€³,2â€²â€³ tetrahydroxy tetraphenyl ethylene.