Author/Authors :
Williams، Ian D. نويسنده , , Chan، Eddie Y. Y. نويسنده , , Mak، Wing-Leung نويسنده , , Lo، Samuel M. F. نويسنده , , Leung، Wa-Hung نويسنده , , Lai، Chui-Ying نويسنده , , Sau، Yiu-Keung نويسنده , , Zhang، Qian-Feng نويسنده ,
Abstract :
Treatment of 2-(methylsulfinyl)benzaldehyde (1) with ethylenediamine or (1R,2R)-(-)-1,2-diaminocyclohexane afforded N,Nʹ-bis[2-(methylsulfinyl) benzylidene]ethylenediamine (L1) or (1R,2R)-N,Nʹ-bis[2-(methylsulfinyl)benzylidene]-1,2-cyclohexanedia mine (L2), respectively. Lithiation of 2bromobenzaldehyde diethylacetal with n-BuLi/TMEDA followed by reaction with (1R,2S,5R)-(-)-menthyl-(S)-p-toluenesulfinate afforded 2-(S)-(ptolylsulfinyl)benzaldehyde diethyl acetal (2). Deprotection of 2 with pyridinium tosylate followed by condensation with ethylenediamine, (1R,2R)-(-)diaminocyclohexane, or (S,S)-(+)-diaminocyclohexane afforded N,Nʹ-bis[2-(S)-(p-tolylsulfinyl)benzylidene]ethylenediamine (L3), (1R,2R)-N,Nʹ-bis[2-(S)(p-tolylsulfinyl)benzylidene]-1,2-cyclohexanediamine ((R,R)-L4), or (S,S)-N,Nʹ-bis[2-(S)-(p-tolylsulfinyl)benzylidene]-1,2-cyclohexanediamine ((S,S)-L4), respectively. Treatment of [Ru(PPh3)3Cl2] with L afforded trans-[Ru(L)Cl2] [L = L1 (3), L2 (4), L3 (5), (R,R)-L4 ((R,R)-6), (S,S)-L4 ((S,S)-6)]. The X-ray structures of (SS,RS)-4, (R,R)-6, and (S,S)-6 have been determined. The average Ru-N, Ru-S, and Ru-Cl distances in (SS,RS)-4 are 2.063, 2.2301, and 2.4039 (angstrom), respectively. The corresponding distances in (R,R)-6 are 2.071, 2.256, and 2.411 (angstrom), and those in (S,S)-6, 2.058, 2.2275, and 2.3831 (angstrom). Compound 3 exhibited a reversible Ru(III/II) couple at 0.56 V vs Cp2Fe+/0 in CH2Cl2. Treatment of 3 with AgNO3 in water afforded the aqua compound trans-[Ru(L1)Cl(H2O)][PF6] (7), which has been characterized by X-ray crystallography. The Ru-Cl, Ru-O, average Ru-N, and average Ru-S distances in 7 are 2.3733(6), 2.1469(16), 2.071, and 2.2442 (angstrom), respectively. Treatment of 3 with AgNO3 followed by reaction with PPh3 afforded [Ru(L1)(PPh3)2][PF6]2 (8). Treatment of [Os(PPh3)3Cl2] with L1 resulted in deoxygenation of one sulfoxide group of L1 and formation of [Os(L5)Cl2 (PPh3)] (9) (L5 = N-[2-(methylsulfinyl)benzylidene]-Nʹ-[2-(methylthio)benzylididene]ethylenediamine), which has been characterized by X-ray crystallography. The average Os-S(O), Os-N(trans to P), Os-N(trans to S), Os-P, and Os-Cl distances are 2.1931, 2.085, 2.175, 2.3641, and 2.4266 (angstrom), respectively.
