1038-95-5. Let¡¯s face it, organic chemistry can seem difficult to learn. Especially from a beginner¡¯s point of view. Like 1038-95-5, Name is Tri-p-tolylphosphine. In a document type is Article, introducing its new discovery.
Rhenium(V) complexes with thiolato and dithiolato ligands: Synthesis, structures, and monomerization reactions
The new compound {(PhS)2ReO(mu-SPh)}2, 1, was synthesized from Re2O7 and PhSH and then used as the synthon for a number of hitherto unknown oxorhenium(V) compounds. Reactions between dithiols and 1 (2:1 ratio) afford {PhSReO(dt)}2, where the dithiols, dtH 2, are 1,2-ethanedithiol (edtH2), 1,3-propanedithiol (pdtH 2), 1,3-butanedithiol (pdtMeH2), 1,2-benzenedithiol (bdtH2), 2-(mercaptomethyl)thiophenol (mtpH2), and 2-mercaptoethyl sulfide (mesH2). Similar reactions carried out with a 3:1 ratio of dtH2 to 1 afford [(ReO)2(dt)3], dt = edt, pdt. When NEt3 was introduced prior to the 3:1 reaction between edtH2 and 1, a compound containing an anionic complex was isolated, [PPh4][ReO(edt) 2]. The new compounds were characterized analytically, spectroscopically, and crystallographically. The Re-O groups in two of the compounds, 1 and {ReO(mu-SPh)(bdt)}2, exist in rare anti orientations; the others adopt the more familiar syn geometry, as discussed. Selected monomerization reactions of {PhSReO(dt)}2 were also carried out: {PhSReO(dt)}2 + 2L = 2[PhSReO(dt)L]. The rate for L = 4-phenylpyridine is given by v = {Ka[L] + Kb[L] 2} ¡Á [{PhSReO(dt)}2], as it is for the reactions of {MeReO(dt)}2; for all of these compounds, the reaction proceeds nearly entirely by the third-order pathway. Values of kb/L 2 mol-2 s-1 at 25.0C are 5.8 ¡Á 102 (mtp), 2.97 ¡Á 103 (pdt), 4.62 ¡Á 105 (edt), and 3.87 ¡Á 105 (bdt). The rate law for the reactions of {PhSReO(dt)}2 with L = PAr3 is v = ka[L]/{1 + K[L]} ¡Á [{PhSReO(dt)}2]. For PPh3, values at 25.0C of Ka/L mol-1 s-1 (k/L mol -1) for {PhSReO(dt)}2 are 9.64 ¡Á 10-2 (1.87) for mtp, 3.43 ¡Á 10-2 (0.492) for pdt, 1.91 (1.42) for edt, 1.84 ¡Á 10-2 (0.82) for bdt, and 1.14 ¡Á 10 3 (10.6) for 1. Mechanisms are proposed that are consistent with the data obtained and with earlier work.
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Reference£º
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate