descofaktors ist imeinzelnen nicht bekannt. AusderTatsache, sowie durch Tetrahydrobiopte-rin ersetzt werden kann, darf man schliekn, daR es sich um ein 6-substituiertes Tetrahydropterin handelt. Da das bei der Hydroxylierung entstehende partiell hydrierte Pteridin-Derivat [320] weder ein 5.8-noch ein 7.8-und sehr wahrscheinlich auch kein 5.6-Dihydropterin sein kann, durfte ein Redox-System mit den Komponenten (165) und (166) vorliegen. H Mit diesem ersten Beispiel fur die Cofaktor-Rolle eines einfachen unkonjugierten Pteridins scheint fur die Schafsleber
In order to determine the degree of racemization, the method worked out by Anderson [161] may be used. Carbobenzoxyglycyl-L-phenylalanine is coupled with the ethyl ester of glycine and the tripeptide formed is fractionally crystallized from a 2 % solution in alcohol. Monoketones react with hydrogen sulfide in the presence of basic catalysts to give geminal dithiols or thioketones. P-Diketones are converted into monothiodiketones. a-Diketones can be selectively reduced by hydrogen sulfide in the cold in the presence of secondary or tertiary amines to give hydroxy-or mono-ketones.Base-catalysed additions of hydrogen sulfide onto carbonyl groups have been little investigated, although they form one of the fundamental reactions of organic chemistry. The reactions are also easily carried out technically, and the cheap intermediate products can be converted into heterocyclic sulfur compounds [2-41 in [l] XVIIth Communication on Sulfur Heterocycles. -XVIth Communication: J. Frunke and R. Mayer, J. prakt. Chem., in the press.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.