Preparation of phenolphthalein using cation exchange resins and

Details Preparation of phenolphthalein using cation exchange resins and Preparation of phenolphthalein using cation exchange resins and

1979-03-09

1981-02-24

Jiles, Henry R.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07D30788

Patent

active

042527252

ABSTRACT:
A process for the preparation of phenol-phthalein wherein phenol and phthalic anhydride are reacted in the presence of a crosslinked sulfonic cation exchange resin in the acid form and wherein the water content of the reaction mixture is reduced by the use of aryl phosphites.
The sulfonic cation exchange resin can be in the macroporous form or in the gel form. The range of useful crosslinking is 4-40 percent for the macroporous resin and 2-16 percent for the gel resin.

REFERENCES:
patent: 3242219 (1966-03-01), Farnham
Yu, Tetrahedron Letters No. 60, pp. 5267-5270, 1969.
Sollazzo et al., La Chemica L'Industria 38:509 (1956).
Bilik et al., Chemical Abstracts 70:96355 1969.
Yamazaki et al., Tetrahedron Letters No. 49, pp. 5047-5050, 1972.

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