Synthesis, Chemistry, DFT Calculations, and ROMP Activity of Monomeric Benzylidene Complexes Containing a Chelating Diphosphine and of Four Generations of Metallodendritic Analogues. Positive and Negative Dendritic Effects and Formation of Dendritic Ruthenium−Polynorbornene Stars
作者:Sylvain Gatard、Samia Kahlal、Denise Méry、Sylvain Nlate、Eric Cloutet、Jean-Yves Saillard、Didier Astruc
DOI:10.1021/om030608r
日期:2004.3.1
chemistry, metallodendrimers DAB-dendr-[PCy2CH2NCH2PCy2Ru(CHAr)(PPh3)(Cl)2]n (8−11) derived from the four first generations of DAB polyamines containing, respectively, 4, 8, 16, and 32 ruthenium branches have been synthesized and characterized by elemental and standard spectroscopic analysis. Dimerization of the ruthenium alkylidene species of these dendrimers is found to increase upon dilution, which
加入Hoveyda的催化剂的反应的[Ru η 2 - (CHAR)}(PCY 3)氯2 ](1 ; Ar为邻- O-我-Pr-C 6 H ^ 4)与二膦的PhCH 2 N(CH 2 PCY 2)2(2)给出了新的空气稳定的绿色钌卡宾络合物的[Ru η 1 - (CHAR)} η 2 - (CY 2 PCH 2)2 N(CH 2 PH)}氯2 ](3A) ,其中2建模聚(二膦)树状聚合物DAB- dendr- [N(CH 2 PCy 2)2 ] n(G 1,n = 4; G 2,n = 8; G 3,n = 16; G 4,n = 32)。复杂的3A在浓缩溶液中可逆地二聚,这是在低温下有利的趋势。的结构图3A还通过DFT计算,这也建立的二聚体结构证实3B和事实的二聚化能量3A是小。容易卤化物抽象通过MALDI-TOF质谱分析示出,并且与AgPF反应6给出了空气稳定的绿色双阳离子二聚体5