have determined the quantities of radon and of radium actually present in the water obtained from three representative radiumwater generators which were operated as directed by the manufacturers. They conclude that steady drinkers of such water are not in danger of radium poisoning. "The alleged th
Synthesis of some tartaric acid derivatives
β Scribed by N. Katsaros; E. Vrachnou-Astra; J. Konstantatos; C.I. Stassinopoulou
- Publisher
- Elsevier Science
- Year
- 1979
- Tongue
- French
- Weight
- 240 KB
- Volume
- 20
- Category
- Article
- ISSN
- 0040-4039
No coin nor oath required. For personal study only.
β¦ Synopsis
The synthesis of dimethyltartaric, ducts of the reaction of V2+ diphenyltartaric and dibenryltartaric acids as proaqueous with pyruvic, phenylglyoxylic and phenylpyruvic acids is described.
Although the derivatives of tartaric acid, dimethyltartaric (4), diphenyltartaric (6), and dibenzyltartaric (6) acids have been known for some time there is no convenient method for their preparation in the literature. Dimethyltartaric' and diphenyltartaric acids2 have been prepared by photolysis of pyruvic and phenylglyoxylic acids in methanol and isopropyl alcohol respectively. Dibenzyltartaric acid has been prepared along with other products by reduction of an aqueous solution of the sodium salt of y-oxy-a-oxo-B,y-diphenylbutyric acid with sodium amalgam under an atmosphere of carbon dioxide?
π SIMILAR VOLUMES
The synthesis of new 16-, 18-, 19-or 20-membered secondary tetralactams with L-tartaric acid or 13-hydroxyglutaric acid moieties is investigated. The stepwise synthesis with an intermediate diamide diamine provides overall good yields (30-55%) compared with other processes using an intermediate diam