Equilibres conformationnels de glucides au niveau de liaisons ? sp2?sp3 C?C. IV. Furannoses hybrid�s sp2 en C(3)

Autor:	Mme F. Barbalat‐Rey, Mme J. Tronchet, J. M. Bourgeois, R. Graf, Jean M. J. Tronchet
Rok vydání:	1972
Předmět:	Coupling constant Allylic rearrangement Chemistry Stereochemistry Organic Chemistry Biochemistry Catalysis Spectral line Inorganic Chemistry Crystallography Reagent Drug Discovery Wittig reaction Physical and Theoretical Chemistry Spectroscopy
Zdroj:	Helvetica Chimica Acta. 55:803-814
ISSN:	1522-2675 0018-019X
DOI:	10.1002/hlca.19720550309
Popis:	The conformation of 34 branched-chain unsaturated sugars, prepared by reacting different Wittig reagents with a series of 1,2-O-isopropylidene-furannosul-3-oses, has been studied by PMR spectroscopy. The position of each compound in the flexible conformational cycle has been established by using the known stereo-dependence of the allylic coupling constants and checked with the other parameters of the spectra. An ‘isopropylidenic’ 4J2,4 coupling constant, present in all compounds whose H—C(4) is endo and absent in their C(4)-epimers has proved useful for configurational assignment at C(4).
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2ff08f8ffe46f7600abbb6509abdba5c https://doi.org/10.1002/hlca.19720550309 Zobrazit plný text záznamu Plný text