Abstract
An efficient method for the synthesis of bromine-containing exo-nido-clusters of a general formula exo-5,6,10-[Br(Ph3P)2Ru]-5,6,10-(μ-H)3-10-H-7,8-R2-nido-7,8-C2B9H6 (R = H, Me) was developed using the reactions of RuBr2(PPh3)3 with [K][7,8-R2-7,8-nido-C2B9H10]. Replacement of the phosphine ligands in the starting exo-nido-cluster (R = H) with the diphosphine ones afforded a series of diamagnetic (18-electron) closo-bromoruthenacarboranes, 3-Br-3,3-[κ2-Ph2P(CH2) n PPh2]-3-H-closo-3,1,2-RuC2B9H11 (n = 3−5). A mild thermal method of the halide ligands exchange (Cl → Br) upon heating of diamagnetic chlorine-containing complexes 3,3-[κ2-Ph2P(CH2) n PPh2]-3-H-3-Cl-closo-3,1,2-RuC2B9H11 (n = 3−5) with excess of CBr4 in benzene (70–80 °C) was suggested for the synthesis of paramagnetic (17-electron) bromine-containing ruthenacarboranes, 3-Br-3,3-[κ2-Ph2P(CH2) n PPh2]-closo-3,1,2-RuC2B9H11 (n = 3, 4) or 3-Br-3,3,8-[κ2-Ph2(CH2)5PPh]-μ-. Paramagnetic chlorine-containing clusters 3-Cl-3,3-[κ2-Ph2P(CH2) n PPh2]-closo-3,1,2-RuC2B9H11 (n = 2−4) were alternatively used as the starting compounds in the exchange reaction. Complexes with dppp and dppb (dppp is 1,3-bis(diphenylphosphino)propane, dppb is 1,4-bis(diphenylphosphino)butane) were used as examples to study the thermal reactions (toluene, 110 °C) leading in the presence of CBr4 to paramagnetic mono(P-o-phenylene)- and bis(P,P-o-phenylene)cycloboronated clusters, 3-Br-3,3,8-[κ2-Ph2(CH2) n PPh]-μ- and 3-Br-3,3,4,8-[κ2-Ph2(CH2) n P]-μ- (n = 3, 4). The compounds obtained were characterized by NMR spectroscopy (in the case of diamagnetic complexes), ESR spectroscopy and mass spectrometry (in the case of paramagnetic compounds). X-ray diffraction experiments were carried out for two cycloboronated paramagnetic complexes.
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Dedicated to Academician of the Russian Academy of Sciences Yu. N. Bubnov on the occasion of his 80th birthday and to the 60th anniversary of A. N. Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 10, pp. 2325–2333, October, 2014.
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D’yachihin, D.I., Grishin, I.D., Piskunov, A.V. et al. Efficient methods for the preparation of bromine-containing exo-nido- and closo-ruthenacarborane clusters. Russ Chem Bull 63, 2325–2333 (2014). https://doi.org/10.1007/s11172-014-0742-0
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DOI: https://doi.org/10.1007/s11172-014-0742-0