Phenol → Phenol, 4,4'-[1,3-phenylenebis(1-methylethylidene)]bis-

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A 500-ml three-neck reactor was charged with Amberlist-15 (7.5 g, 2.6 mmols), phenol (178.5 g, 633 mmols) and p-xylene (60 ml). The contents were heated up to 80° C. in nitrogen atmosphere. Under agitation, a mixture of m-diisopropenylbenzene (m-DIPeB, 15.0 g, 31.5 mmols) and p-xylene (60 ml) was fed thereto over 3 hours at 80° C. After completion of the feed, agitation was carried out at 80° C. for 10 minutes and then Amberlist-15 was removed by filtration. The filtrate was analyzed by liquid chromatography. Bisphenol M (α, α″-bis(4-hydroxyphenyl)-1,3-diisopropylbenzene, 30.5 g, yield 93%), the intended product, and the o, p-product, the position isomer of bisphenol M (α-(4-hydroxyphenyl)-α″-(2-hydroxyphenyl)-1,3-diisopropylbenzene, 1.67 g, yield 5.1%), were obtained.

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