Diselenastanna‐, ‐sila‐ and ‐carbacycles with an annelated dicarba‐closo‐dodecaborane(12) unit |
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Authors: | Bernd Wrackmeyer Zureima García Hernández Rhett Kempe Max Herberhold |
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Institution: | Anorganische Chemie II, Universit?t Bayreuth, D‐95440 Bayreuth, Germany |
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Abstract: | The reactions of the 1,2‐diselenolato‐1,2‐dicarba‐closo‐dodecaborane(12) dianion 1 with diorganoelement(IV) dichlorides (Ph2CCl2, Me2SiCl2, Ph2SiCl2, Me2SnCl2, Ph2SnCl2) gave novel five‐member heterocycles along with other products. The molecular structures of the five‐member rings containing CPh2 ( 2 ) and SnPh2 ( 9 ) moieties between the selenium atoms were determined by X‐ray analyses. In the case of the chlorosilanes, the analogous five‐member ring containing the SiPh2 unit ( 4 ) could be identified in mixtures. The expected reaction was accompanied by rearrangement leading to formation of another five‐member ring 6 containing the Ph2Si? Se? Se moiety. Oxidative addition of the five‐member heterocycles containing tin ( 7, 9 ) to ethene‐bis(triphenylphosphane)platinum(0) gave at low temperature the bis(triphenylphosphane)platinum(II) complexes 12 and 13 , where the Pt(PPh3)2 fragment had been inserted into one of the Sn? Se bonds. Extensive decomposition of these complexes was observed above ? 20 °C. The proposed solution‐state structures of the new compounds are supported by multinuclear magnetic resonance data (1H, 11B, 13C, 29Si, 31P, 77Se, 119Sn and 195Pt NMR). Copyright © 2007 John Wiley & Sons, Ltd. |
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Keywords: | carborane selenium silicon tin platinum NMR X‐ray |
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