Reduction of Co(II) with NaBH₄ in the presence of triphenylphosphine

Abstract

The reactions of NaBH4 with Co(II) compounds in the presence of triphenylphosphine (P) have been studied in ethanol and benzene solutions. The conditions for the isolation of the Co(I) complexes, Co(BH4)Pn (n = 2, 3), have been established and the structures of these species are discussed in the light of various physical measurements.

Production of Ni(I) complexes from reactions between Ni(II) and NaBH4 in the presence of triphenylphosphine and some bidentate phosphines

“…Regarding the bonding of BH,, the ir spectrum is consistent with bidentate coordination (141, with bands at 2440 cm-' (v ,-,, J, 1970 cm-I (v ,-,, ), and 1380 cm-I (vbridge although the expected BH, deformation at 1100-1200 cmpl is not identifiable due to ligand vibrations in this region. On deuteration, the v,-,~ vibration shifts to 1840 cm-I giving v,/v, as 0.754, similar to values observed previously (7). The main feature of the electronic spectrum of the complex (Table 3, Fig.…”

“…In fact "most known Ni(1) complexes and all isolated Pd (1) and Pt (1) complexes are binuclear in nature, giving diamagnetic metal-metal bonded or ligand-bridged bimetallic species" (3). It has recently been shown (7) that the products formed from (x = 2 or 3), H3CoP,, HCo(N,)P3, Co(0)-P complexes and P-BH,, depend essentially on three factors, i.e., the rute of addition of NaBH,, the solvent, and the presence or absence of free ligand. In view of the complexity of these Co(I1) reactions, the analogous Ni(11) system has been more extensively investigated.…”

“…It has not been possible to convert [Ni(BH,)P,], into any other Ni-BH, complex as was the case with Co, i.e. Co(BH,)P, + Co(BH,)P, (7).…”

The orthopalladation dinuclear [Pd(L1)(μ-OAc)]2, [Pd(L2)(μ-OAc)]2 and mononuclear [Pd(L3)2] complexes with [N, C, O] or [N, O] containing ligands: Synthesis, spectral characterization, electrochemistry and catalytic properties

“…Even though a lot of success has been achieved with regard to transition metal complexes in the catalytic hydrogenation of olefins [18][19][20], there are only few reports on studies involving hydrogenations of arenes using homogeneous metal complex catalysts [21][22][23]. As a catalyst, palladium is very important in pharmaceutical industry.…”

Ni(II) and Ru(II) Schiff base complexes as catalysts for the reduction of benzene

“…The catalytic reduction of benzene nucleus generally requires more severe conditions than that of simple olefins [21]. Even though a lot of success has been achieved with regard to transition metal complex catalyzed hydrogenation of olefins [22][23][24][25], there are only few reports on studies involving hydrogenations of arenes using homogeneous metal complex catalysts [26][27][28][29][30][31][32]. A few homogeneous ruthenium-based catalysts have been pre-pared and used as catalysts for hydrogenation of aromatics [33][34][35][36][37][38][39].…”