名称:
                                Synthesis of Chiral Cationic (Diimino‐ and diaminodiphosphane)ruthenium Complexes and Their Applications in Catalytic Oxidation − Crystal Structures of
            cis
            ‐[RuCl(py){κ
            4
            ‐Ph
            2
            PC
            6
            H
            4
            CH=NC
            6
            H
            10
            N=CHC
            6
            H
            4
            PPh
            2
            }]BF
            4
            and
            cis
            ‐[RuCl(py){κ
            4
            ‐Ph
            2
            PC
            6
            H
            4
            CH=NC
            6
            H
            10
            N(H)CH
            2
            C
            6
            H
            4
            PPh
            2
            }]BF
            4
                             
                            
                                摘要:
                                AbstractHalide abstraction of trans‐[RuCl2{κ4‐(1R,2R)‐PNNP}] {(1R,2R)‐PNNP = (1R,2R)‐N,N′‐bis[2‐(diphenylphosphanyl)benzylidene]‐1,2‐diiminocyclohexane} and trans‐[RuCl2{κ4‐(1R,2R)‐P(NH)(NH)P}] {(1R,2R)‐P(NH)(NH)P = (1R,2R)‐N,N′bis[2‐(diphenylphosphanyl)benzylidene]‐1,2‐diaminocyclohexane} with AgBF4 in acetonitrile at ambient temperature gave cis‐[RuCl(CH3CN){κ4‐(1R,2R)‐PNNP}][BF4] (1) and cis‐[RuCl(CH3CN){κ4‐(1R,2R)‐P(NH)(NH)P}][BF4] (2), respectively. When 1 was refluxed in pyridine (py), the coordinated CH3CN was replaced by pyridine to form cis‐[RuCl(py){κ4‐(1R,2R)‐PNNP}][BF4] (3). However, when 2 was refluxed in pyridine, one of the amino moieties (−CH2−NH−)was oxidized to an imino moiety (−CH=N−) with concomitant displacement of the coordinated CH3CN by pyridine to produce cis‐[RuCl(py){κ4‐(1R,2R)‐P(N)(NH)P}][BF4] (4). The structures of 3 and 4 were ascertained by X‐ray crystallography. Compounds 1−4 are effective catalysts for the epoxidation of various olefins with air. A turnover frequency of up to 733 h−1 and an enantiomeric excess of up to 24% were obtained for the epoxidation of styrene catalysed by 2. Compound 2 can also catalyse the epoxidation, dehydrogenation and C−H activation of various olefins, alcohols and alkanes by tert‐butyl hydroperoxide with high chemical selectivity. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)