Formula: C26H24P2. Aromatic heterocyclic compounds can also be classified according to the number of heteroatoms contained in the heterocycle: single heteroatom, two heteroatoms, three heteroatoms and four heteroatoms. Compound: 1,2-Bis(diphenylphosphino)ethane, is researched, Molecular C26H24P2, CAS is 1663-45-2, about Synthesis of ruthenium-dithiocarbamate chelates bearing diphosphine ligands and their use as latent initiators for atom transfer radical additions. Author is Aldin, Mohammed Zain; Zaragoza, Guillermo; Delaude, Lionel.
Nine representative [Ru(S2CNEt2)2(diphos)] complexes were prepared in almost quant. yields (91-97%) from [RuCl2(p-cymene)]2, Na diethyldithiocarbamate trihydrate, and a diphosphine (dppm, dppe, dppp, dppb, dpppe, dppen, dppbz, dppf, or DPEphos), using a novel, straightforward, 1-pot procedure. The recourse to a monomodal microwave reactor was instrumental in reaching the thermodn. equilibrium favoring the targeted monometallic trichelates. All the products were fully characterized by using various anal. techniques and the mol. structures of seven of them were determined by x-ray crystallog. NMR, XRD, and IR spectroscopies evidenced a significant contribution of the thioureide resonance form Et2N+:CS2-2 to the electronic structure of the 1,1-dithiolate ligand. MS/MS spectrometry showed the formation of phosphine-free [Ru(S2CNEt2)2]+ cations in the gas phase, except when starting from [Ru(S2CNEt2)2(dppbz)]. The activity of the nine complexes was probed in three different catalytic processes, viz., the cyclopropanation of styrene with Et diazoacetate, the synthesis of vinyl esters from HOBz and 1-hexyne, and the atom transfer radical addition (ATRA) of CCl4 and Me methacrylate. In the 1st two reactions, the saturated trichelates were poorly efficient. This was most likely due to their high stability, which prevented the formation of coordinatively unsaturated species. Contrastingly, with a turnover number of 2000 and an initial turnover frequency of 2080 h-1 for a 0.05 mol% catalyst loading, the [Ru(S2CNEt2)2(dppm)] complex emerged as a very robust, latent ATRA initiator, whose activity matched or outperformed those displayed by the most efficient Ru catalysts described so far.
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Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis