2,3-Diphenylbutane-2,3-diol → 2,3-Diphenyl-1,3-butadiene

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Reaction Steps

A mixture of 50 parts of 2,3-diphenyl-2,3-dihydroxybutane and 0.5 part of freshly dehydrated KHSO4 is distilled for 50 minutes at 11 Torr and 200° C. bath temperature. The fraction which is collected within the boiling range of 150°-180° C./11 Torr yields 43.8 parts of crude 2,3-diphenyl-1,3-butadiene. The product is stirred direct with 21.5 parts of acrylic acid and 2 parts of hydroquinone under a nitrogen atmosphere for 3 hours at 130° to 140° C.

Provenance & Evidence