The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 23, 2010
Filed:
Sep. 29, 2008
Venkata Rama Narayanan Ganapathy Bhotla, Kamataka, IN;
Dwairath Dhar, Kamataka, IN;
Gurram Kishan, Kamataka, IN;
Salkod Parameshwar Mallika, Kamataka, IN;
Venkata Rama Narayanan Ganapathy Bhotla, Kamataka, IN;
Dwairath Dhar, Kamataka, IN;
Gurram Kishan, Kamataka, IN;
Salkod Parameshwar Mallika, Kamataka, IN;
Abstract
A method for producing a phenolphthalein compound is disclosed, comprising: reacting a phenolic compound of the formula: wherein Ris a hydrogen or a C-Chydrocarbyl group, with a phthalic anhydride compound of the formula: wherein Ris a hydrogen, a C-Chydrocarbyl group, or a halogen, in the presence of an ionic liquid catalyst composition and a promoter to form a reaction mixture comprising a phenolphthalein compound of the formula: wherein each Ris independently a hydrogen or a C-Chydrocarbyl group, and Ris a hydrogen, a C-Chydrocarbyl group, or a halogen; wherein the ionic liquid catalyst composition comprises a combination of an ionic liquid and a metal halide wherein the metal is selected from the group consisting of a Group IIB, IIIA, VIII, or IVA metal, and a combination thereof.