50777-73-6Relevant articles and documents
Ruthenium(II) complexes containing a phosphine-functionalized thiosemicarbazone ligand: Synthesis, structures and catalytic C-N bond formation reactions via N-alkylation
Ramachandran, Rangasamy,Prakash, Govindan,Selvamurugan, Sellappan,Viswanathamurthi, Periasamy,Malecki, Jan Grzegorz,Linert, Wolfgang,Gusev, Alexey
, p. 11405 - 11422 (2015/03/05)
A series of ruthenium(II) complexes incorporating a thiosemicarbazone chelate tethered with a diphenylphosphine pendant have been studied. Thus, [(PNS-Et)RuCl(CO)(PPh3)] (1), [N,S-(PNS-Et)RuH(CO)(PPh3)2] (2) and [(PNS-Et)RuCl(PPh3)] (3) were synthesized by reactions of various RuII precursors with 2-(2-(diphenylphosphino)benzylidene)-N-ethylthiosemicarbazone (PNS-Et). However, complexation of PNS-Et with an equimolar amount of [RuCl2(dmso)4] resulted in two different entities [(PNS-Et)RuCl(dmso)2] (4) and [(PNS-Et)2Ru] (5) with different structural features in a single reaction. All the RuII complexes have been characterized by analytical and various spectroscopic techniques. Compounds 1-5 were recrystallized, and the X-ray crystal structures have been reported for 1, 2 and 5. In the complexes 1 and 3-5 the ligand coordinated in a tridentate monobasic fashion by forming PNS five- and six-membered rings, whereas in 2, the ligand coordinated in a bidentate monobasic fashion by forming a strained NS four-membered ring. Furthermore, compounds 1-5 showed catalytic activity in N-alkylation of heteroaromatic amines. Notably, complexes 1-3 were found to be very efficient catalysts toward N-alkylation of a wide range of heterocyclic amines with alcohols. In the presence of a catalytic amount of 2 with 50 mol% of KOH, N1,C5-dialkylation of 4-phenylthiazol-2-amine has been investigated. Reaction of in situ generated aldehyde with amine yields the N1,C5-dialkylated products through the hydride ion transformation from alcohol. Complexes 1-3 also catalyzed a variety of coupling reactions of benzyl alcohols and sulfonamides, which were realized often with 99% isolated yields. Advantageously, only one equivalent of the primary alcohol was consumed in the process.
CuI complexes containing a multidentate and conformationally flexible dibenzylidene acetone ligand (dbathiophos): Application in catalytic alkene cyclopropanation
Jarvis, Amanda G.,Whitwood, Adrian C.,Fairlamb, Ian J. S.
, p. 3695 - 3702 (2011/07/30)
The synthesis and characterisation of a multidentate conformationally flexible ligand based on the dibenzylidene acetone core structure, dbathiophos (1), is described. Ligand 1 has a high affinity for cationic and neutral Cu I species. Three unique CuI complexes (4-6) are reported showing that the ligand backbone of dbathiophos is hemilabile, and able to adopt different 1,4-dien-3-one conformational geometries around CuI. Complexes 4 and 6 both effectively catalyse the cyclopropanation of styrene with ethyl diazoacetate at low catalyst loadings (1 mol% Cu). The Royal Society of Chemistry 2011.
o-diphenylphosphinobenzaldehyde complexes of palladium(II) and platinum(II): Synthesis, spectroscopy and structure
Mahalakshmi,Phadnis, Prasad P.,Jain, Vimal K.,Tiekink, Edward R. T.
, p. 2287 - 2293 (2007/10/03)
Preparation of the o-diphenylphosphinobenzaldehyde complexes of Pd(II) and Pt(II), with general formulae [MX2L2], [Pd 2Me2(μ-Cl)2L2] and [PdMeClL 2] where [M = Pd or Pt; X = Cl, Br, I and L = o- diphenylphosphinobenzaldehyde, {PPh2(o-C6H 4CHO)}], is reported here. All complexes have been characterized by elemental analysis, IR, NMR (1H, 13C, 31P and 195Pt) and UV-visible spectroscopy, that allowed the deduction of the stereochemistry for the complexes. The mononuclear complexes have been found to adopt the trans configuration in square-planar geometries. The molecular structure of trans-[PdCl2{PPh2(C6H 4CHO)}2] has been established by a single crystal X-ray diffraction study and confirms the spectroscopic conclusions.
