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The first aryl derivatives of c/oso-hexahydrohexaborate are formed by reaction of [B 6 H 6 ] 2-  with 1-bromo-4-nitrobenzene and 2-bromo-5-nitrotoluene in acetonitrile at 80 °C. Cs 2 [B 6 H 5 - (1,4-C 6 H 4 (NO 2 ))] and Cs 2 [B 6 H 5 (C 6 H 3 -1-(CH 3 )-5-(NO 2 ))] can be isolated by ion exchange chromatography on diethylaminoethyl (DEAE) cellulose. Further treatment with /V-chlorosuccinimide yields the perhalogenated derivative (CH 2 Py 2 )[B 6 Cl 5 (1,4-Ph(NO 2 ))]CH 3 CN which has been characterized by X-ray diffraction analysis (orthorhombic, space group P2( 2,2t, a = 9.810(4), b - 14.412(3), c - 18.586(9) A, Z = 4). The  11 B NMR spectra of all compounds are consistent with a monosubstituted B 6 -cluster. The IR and Raman spectra exhibit characteristic BB, BH, CH, CC and NO vibrations, respectively.

zeitschrift für naturforschung b

Darstellung,  11 B-,  13 C-NMR- und Schwingungsspektren von Cs 2 [B 6 H 5 (p-C 6 H 4 (NO 2 ))] und Cs 2 [B 6 H 5 (C 6 H 3 -l-(CH 3 )-5-(NO 2 ))] sowie Kristallstruktur von (CH 2 Py 2 )[B 6 Cl 5 (p-C 6 H 4 (NO 2 ))]·CH 3 CN / Preparation,  11 B ,  13 C-NMR and Vibrational Spectra of Cs 2 [B 6 H 5 (p-C 6 H 4 (NO 2 ))], Cs 2 [B 6 H 5  (C 6 H 3 -1 -(CH 3  )-5-(NO 2 ))] and Crystal Structure of (CH 2 Py 2 )[B 6 Cl 5 (p-C 6 H 4 (NO 2 ))]·CH 3 CN