Method for preparing 1,1,1-tris(4-hydroxyphenyl)ethane

Details Method for preparing 1,1,1-tris(4-hydroxyphenyl)ethane Method for preparing 1,1,1-tris(4-hydroxyphenyl)ethane

1996-12-16

1998-06-09

Geist, Gary

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

C07C 3912

Patent

active

057636869

ABSTRACT:
1,1,1-Tris(4-hydroxyphenyl)ethane, a branching agent for polycarbonates, is prepared by the reaction of phenol with 2,4-pentanedione in the presence of sulfuric acid and at least one mercapto sulfonic acid such as 3-mercaptopropanesulfonic acid as promoter. By employing specific proportions of the promoter and sulfuric acid, high product yields can be obtained in relatively short times.

REFERENCES:
patent: 3579542 (1971-05-01), Meyer
patent: 4992598 (1991-02-01), Strutz
patent: 5130467 (1992-07-01), Mott
patent: 5463140 (1995-10-01), Wehmeyer et al.

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