Determination of signs of coupling constants [1J(77Se29Si),2J(77Se13C),3J(77Se1H)] in 2,5-dihydro-1,2,5-selenasilaborole derivatives

Autor:	Bernd Wrackmeyer, Günter Seidel, Roland Köster
Rok vydání:	1995
Předmět:	Coupling constant Diene Stereochemistry Pulse sequence General Chemistry Adduct chemistry.chemical_compound Crystallography chemistry Heteronuclear molecule Transition metal Atom General Materials Science Two-dimensional nuclear magnetic resonance spectroscopy
Zdroj:	Magnetic Resonance in Chemistry. 33:493-496
ISSN:	1097-458X 0749-1581
DOI:	10.1002/mrc.1260330615
Popis:	The signs of coupling constants [1J(77Se29Si) > 0, 2J(77Se13CSiMe) > 0,3J(77Se1HSiMe) > 0] were determined for pentaorgano-substituted 2,5-dihydro-1,2,5-selenasilaboroles [R3 = Me, la; R3 = C(Me)CH2, 1b], and also for derivatives in which the surroundings of the selenium atom were changed by forming a pyridine-borane adduct (2), by formation of an SeAlCl3 adduct (3) and by π-complexation with the transition metal fragments [Fe(CO)3] (4) and [Ru(CO)3] (5). The sign determination was achieved by using various types of 2D heteronuclear shift correlations (HETCOR) with 13C, 29Si or 1H detection (HMQC). Some of these experiments had to be modified by z-filtering or by a Ψ-BIRD pulse sequence. The change in the magnitude of 1J(13C13C) (la, 58.9 Hz; 4, 33.8 Hz) as a result of π-complexation follows the trend known for diene complexes.
Databáze:	OpenAIRE
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