Alternative Paths for the BPA Synthesis

Except for phenol and acetone, other compounds were also tested over the years as possible raw materials for the BPA synthesis. The reactions of methylacetylene, allene, 1,2-isopropenylphenol or 1,4-isopropenylphenol and isopropenyl acetate with phenol were 

9 4-(3,4-dihydro-2,2,4-trimethyl-2H-l-benzopyrane-4-yl)-phenol (Dianin s compound) 30.61 

11 3-(4-hydroxyphenyl)-2,3-dihydro-l,l,3-trimethyl-lH-indene-5-ol (cyclic dimer) 17.24 

As it was mentioned earlier, many byproducts are formed in the conventional BPA synthesis from acetone and phenol that unfavorably results in the necessity of very costly purification steps and loss of the raw materials. Thus, recently the method of BPA 

the idea of direct use of cumene hydroperoxide as the raw material for the BPA synthesis which includes the following two steps the catalyzed cleavage of CHP and the condensation of so obtained phenol and acetone. It was found that the use of some specific combination of catalysts for the both steps provides high yields of BPA and low yields of impurities, without need for intermediate purification steps [69]. The use of an acid treated montmorillonite clay as the catalyst for the CHP cleavage, and a cross-linked cation-exchange resin with pyridyl ethyl mercaptan or 

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