ISSN:
0749-1581
Keywords:
Liquid- and solid state 13C, 29Si, 119Sn NMR X-ray analysis
;
Heterocylic organotin compounds 1J(13C=13C)
;
Sign of 2J(119Sn117Sn) 1J(13C11B) in 13C and J(119Sn11B) in 119Sn CP-MAS NMR spectra
;
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Derivatives of 2,5-dihydro-1,2,5-oxoniastannaboratoles were studied by multinuclear magnetic resonance both in the liquid (11B, 13C, 29Si, 119Sn NMR) and solid state (13C, 29Si, 119Sn CP/MAS NMR). Together with the results of the x-ray analysis of the 4,5,5-triethyl-2,5-dihydro-1,2,2-trimethyl-3-phenyl-1,2,5-oxoniastannaboratole-tetrahydrofuran adduct (1-THF) (space group P21/c) the NMR data [chemical shifts and coupling constants J(119SnE) (E = 13C, 29Si, 119Sn)] allowed the assessment of structural features in solution and in the solid state (e.g. the weakened coordinative Sn-O interactions in 1-THF in solution). The 1J(13C=13C) values in 4,5,5-triethyl-2,5-dihydro-1,2,2-trimethyl-3-trimethylsilyl- and -3-trimethylstannyl-1,2,5-oxoniastannaboratole and in some non-cyclic alkenes bearing organometallic substituents were measured using INEPT experiments based on 3J(13C1H) long-range coupling constants. In the presence of one boryl- and two stannyl groups the magnitude of 1J(13C=13C) values is reduced to ca. 30 Hz. A positive sign for 2J(119Sn117Sn) in 2-diethylboryl-1,1-bis(trimethylstannyl)but-1-ene was determined by 2D 13C—1H and 2D 119Sn-H heteronuclear shift correlations. Scalar 13C—11B and 119Sn-11B coupling has been observed for the first time in 119Sn CP-MAS NMR spectra.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/mrc.1260291304
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