Etude chimique et spectroscopique du système B(SCH3)3-B(NCS)3

Reaction of trimethylthioborate, B(SMe) 3 , with triisothiocyanatoborane, B(NCS) 3 , at room temperature gives mixtures containing B(SMe) 3 , the mixed compounds B(NCS)(SMe) 2 and B(NCS) 2 (SMe) in low concentration, and association compounds. The previous compounds cannot be isolated due to equilib...

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Bibliographic Details
Published in:Canadian journal of chemistry 1979-05, Vol.57 (10), p.1122-1126
Main Authors: Atchekzai, Habib-Raman, Mongeot, Henri, Dazord, Jacques, Tuchagues, Jean-Pierre
Format: Article
Language:eng ; fre
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Summary:Reaction of trimethylthioborate, B(SMe) 3 , with triisothiocyanatoborane, B(NCS) 3 , at room temperature gives mixtures containing B(SMe) 3 , the mixed compounds B(NCS)(SMe) 2 and B(NCS) 2 (SMe) in low concentration, and association compounds. The previous compounds cannot be isolated due to equilibria being set up. Mass spectrometry, infrared and nmr data are reported. Structures involving S-B donor-acceptor bonds between the monomers are proposed for the association compounds {B(NCS) 2 (SMe)} 2 , {B(NCS) 2 (SMe)} 2 {B(NCS) 3 }, and {B(NCS) 2 (SMe)} 2 {B(NCS) 3 } 2 . Reaction of these compounds with trimethylamine yields Me 3 NB(NCS) 3 and Me 3 NB(NCS) 2 (SMe). The same reaction with dimethylsulphide is incomplete and yields only Me 2 SB(NCS) 3 . Acidity strength decreases in the order B(NCS) 3  > B(NCS) 2 (SMe) > B(NCS)(SMe) 2  > B(SMe) 3 . This trend explains why dimerization of B(NCS) 2 (SMe) occurs whereas B(NCS)(SMe) 2 is unassociated.
ISSN:0008-4042
1480-3291
DOI:10.1139/v79-184