Abstract
The chemistry of ruthenium–borane complex, [Cp∗RuCO(μ-H)BH2L] (Cp∗=η5-C5Me5; L=C7H4NS2), 1 with various alkynes has been explored. Photolysis of 1 with alkynyl-Grignard, [HCCMgBr] in toluene led to the isolation of vinyl hydroborate complex [Cp∗Ru(μ-H)BH{HCCH2}L], 2a as a sole product. Compound 2a can be viewed as a ruthenium–borate complex with an ethylene moiety. Further, the chemistry of 1 with various internal and terminal alkynes has been performed in photolytic conditions. Photolysis of 1 with [RCCR] (R=CO2Me) yielded vinyl hydroborate complex [Cp∗Ru(μ-H)BCl{RCCR}L], 2b. Terminal alkynes [HCCR] (R=Ph or CO2Me) under the same reaction conditions led to the isolation of metal vinyl complexes [Cp∗Ru(CO)(C2HR)(L)], 3a and 3b (3a: R=Ph; 3b: R=CO2Me). In addition, DFT calculations were carried out to analyze the bonding and electronic structures of these new compounds.
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