The indirect measurement of 11BH coupling constants in some organoboron compounds

Bogdanov, V. S.; Kessenikh, A. V.; Negrebetsky, Vitaliy V.

doi:10.1016/0022-2364(71)90073-4

Cited by 3 publications

(1 citation statement)

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“…In the 1 H NMR spectra of K [3] and K [4] the signals of methoxy groups are shifted to high field in comparison with 1 and 2 up to 3.22 and 3.17 ppm, respectively, and appear as 1:1:1:1 quartets due to long-range B-H coupling ( 3 J B,H = 3.7-3.8 Hz). Such coupling has also been previously observed for some organoboron compounds [29][30][31][32], methylsulfanyl derivatives of the closo-dodecaborate anion [33,34] and B-methysulfanyl derivatives of cobalt bis(dicarbollide) anion [35].…”

Section: Resultssupporting

confidence: 74%

Dimethyloxonium and Methoxy Derivatives of nido-Carborane and Metal Complexes Thereof

et al. 2019

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9-Dimethyloxonium, 10-dimethyloxonium, 9-methoxy and 10-methoxy derivatives of nido-carborane (9-Me2O-7,8-C2B9H11, 10-Me2O-7,8-C2B9H11, [9-MeO-7,8-C2B9H11]−, and [10-MeO-7,8-C2B9H11]−, respectively) were prepared by the reaction of the parent nido-carborane [7,8-C2B9H12]− with mercury(II) chloride in a mixture of benzene and dimethoxymethane. Reactions of the 9 and 10-dimethyloxonium derivatives with triethylamine, pyridine, and 3-methyl-6-nitro-1H-indazole result in their N-methylation with the formation of the corresponding salts with 9 and 10-methoxy-nido-carborane anions. The reaction of the symmetrical methoxy derivative [10-MeO-7,8-C2B9H11]− with anhydrous FeCl2 in tetrahydrofuran in the presence of t-BuOK results in the corresponding paramagnetic iron bis(dicarbollide) complex [8,8′-(MeO)2-3,3′-Fe(1,2-C2B9H10)2]−, whereas the similar reactions of the asymmetrical methoxy derivative [9-MeO-7,8-C2B9H11]− with FeCl2 and CoCl2 presumably produce the 4,7′-isomers [4,7′-(MeO)2-3,3′-M(1,2-C2B9H10)2]− (M = Fe, Co) rather than a mixture of rac-4,7′- and meso-4,4′-isomers.

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