| 摘要 |
1340869 Preparation of p-isopropenylphenol and phenol from bisphenol tar and the preparation of bisphenol A therefrom UNION CARBIDE CORP 30 Dec 1970 [31 Dec 1969] 61851/70 Heading C2C Tars containing 2,4<SP>1</SP>-bisphenol A, trisphenols and polyphenols may be treated with a basic catalyst to obtain a product comprising p-isopropenylphenol and phenol. The basic catalyst is preferably a basic compound of an alkali metal or an alkaline earth metal. The products p-isopropenylphenol and phenol may be reacted in the presence of an acid catalyst and an excess of phenol to form 4,4<SP>1</SP>-bisphenol -A. |
