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Synthesis and reactivity of some diselenasila cycles containing an annelated dicarba‐ closo ‐dodecaborane(12) unit
Author(s) -
Wrackmeyer Bernd,
Klimkina Elena V.,
Milius Wolfgang
Publication year - 2010
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.1582
Subject(s) - chemistry , reactivity (psychology) , silanes , nmr spectra database , dilithium , salt (chemistry) , carborane , medicinal chemistry , proton nmr , stereochemistry , crystallography , spectral line , organic chemistry , ion , silane , medicine , physics , alternative medicine , pathology , astronomy , deprotonation
The use of 1,2‐diselenolato‐1,2‐dicarba‐ closo ‐dodecaborane(12) dianions [1,2‐(1,2‐C 2 B 10 H 10 )Se 2 ] 2− prepared in situ as the dilithium salt may lead to irreproducible results. This is shown by the straightforward synthesis of silanes using the purified and isolated dianions, in contrast with previous less successful attempts. Thus, the reactions of the dianions with dichlorosilanes afford the five‐membered diselenasila cycles containing the SiMe 2 or the SiPh 2 units, and with 1,2‐dichloro‐tetramethyldisilane the six‐membered cycle containing the Si 2 Me 4 unit. The latter was studied by X‐ray diffraction, and all products were characterized by multinuclear magnetic resonance ( 1 H, 13 C, 29 Si, 77 Se NMR) in solution. Novel isotope effects were detected in 13 C and 77 Se NMR spectra. Exchange reactions of the five‐ and six‐membered diselanasila cycles with chlorosilanes were studied. Copyright © 2009 John Wiley & Sons, Ltd.