期刊
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
卷 639, 期 7, 页码 1188-1193出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/zaac.201300120
关键词
Boron; Carboranes; Diborane(4); Borylation; Boron heterocycles
资金
- Deutsche Forschungsgemeinschaft (DFG)
- Fonds der Chemischen Industrie
- National Natural Science Foundation of China [20702020]
- Natural Science Foundation of Shandong Province [ZR2010BM020]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry [SQT0804]
Reaction of dilithio-o-carborane Li2C2B10H10 (generated in situ from o-carborane 1 and butyllithium) with the 1, 2-diborylbenzene derivative 1, 2-C6H4(iPr2NBCl)2 yielded the o-carborane compound 3 having the fused exo-polyhedral C2B2C2 heterocycle. The analogous reactions with 1, 1-bis(dimethylaminochloroboryl)ethane and with 1, 3-dichloro-1, 2,3-tris(dimethylamino)triborane(5) afforded the o-carborane compounds 5 and 7 containing the fused exo-polyhedral five-membered C2B2C and C2B3 rings, respectively. Attempts to use 1, 2-dichloro-1, 2-bis(dimethylamino)diborane(4) for the synthesis of the o-carborane compound 10 with a fused exo-polyhedral C2B2 ring instead led to the diborane(4)yl-o-carborane species 9c and 9d (the latter in trace amount), which contain a diborane(4)yl moiety bonded to the o-carborane. The molecular compositions of the new o-carborane derivatives follow from NMR spectroscopic and mass spectrometric data as well as from X-ray diffraction analyses of 3, 7 and 9c. The structures exhibit weak intramolecular C-H center dot center dot center dot H-B hydrogen-hydrogen interactions.
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