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Hickson and Welch Ltd
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Hickson and Welch Ltd
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Publication of ES237710A2publicationCriticalpatent/ES237710A2/en
Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems
(AREA)
Abstract
Improvements introduced in the object of the Main Patent number 237,635, for: "Procedure for the preparation of optical bleaching agents", which consist of new compounds of the general formula ** (See formula) ** (where X is hydrogen, a non-chromophore or non-auxocchrome group, n is an integer from 1 to 5, R1 is hydrogen or a hydrocarbon radical, and R2 is hydrogen, a hydrocarbon radical, a hydroxyalkyl or polyethoxy group) and salts thereof, in particular water soluble, for example of alkali metal, particularly sodium salts, which comprise oxidizing an o-amino azo of the general formula ** (See formula) ** (in which X, n, R1 and R2 have the meanings set out above). (Machine-translation by Google Translate, not legally binding)
ES0237710A1957-04-181957-09-21Procedure for the preparation of optical blanking agents (Machine-translation by Google Translate, not legally binding)
ExpiredES237710A2
(en)
Procedure for the manufacture of derivatives of the 1-bencil tetrahidroisoquinolina basically replaced (Machine-translation by Google Translate, not legally binding)