ES433870A3 - A procedure for the preparation of tile type laminate derivatives. (Machine-translation by Google Translate, not legally binding)
- Google Patents
A procedure for the preparation of tile type laminate derivatives. (Machine-translation by Google Translate, not legally binding)
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Yamanouchi Pharmaceutical Co Ltd
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Yamanouchi Pharmaceutical Co Ltd
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Priority to ES433870ApriorityCriticalpatent/ES433870A3/en
Publication of ES433870A3publicationCriticalpatent/ES433870A3/en
Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals
(AREA)
Abstract
A process for the preparation of thiamine derivatives of the thiol type represented by the formula: **(See formula)** where R is a member selected from the group consisting of a hydrogen atom and an α-hydroxyethyl group, and in the case that R is an α-hydroxyethyl group, said formula represents the dl form and the optically active dyl forms, whose The procedure consists in reacting a thiamine derivative of the thiol type represented by the formula: **(See formula)** where R has the meaning given above and Met is a member selected from the group consisting of a hydrogen atom, an alkali metal and ammonium, with a carbonyl dihalide represented by the formula COX2 (where X is a member selected from the group formed by a chlorine atom and a bromine atom), at a temperature below -10ºC. to provide a dithiamine carbonate represented by the formula: **(See formula)** where R has the meaning given above, and add a basic substance, selected from the group consisting of an alkaline hydroxide, an alkaline carbonate and ammonium hydroxide, to a derivative of dithiamine carbonate, with which the reaction mixture passes from neutral conditions to alkaline conditions. (Machine-translation by Google Translate, not legally binding)
ES433870A1975-01-161975-01-16A procedure for the preparation of tile type laminate derivatives. (Machine-translation by Google Translate, not legally binding)
ExpiredES433870A3
(en)
A procedure for the production of a compound of 1- (3,7-dimethylocyloxy) -benzene 4-substituted. (Machine-translation by Google Translate, not legally binding)
A procedure for the production of derivatives substituted of phenoxy-alpha-methylpropionic acid. (Machine-translation by Google Translate, not legally binding)