83267-99-6Relevant academic research and scientific papers
Cobalt-catalyzed carbonylation of benzyl halides using polyethylene glycols as phase-transfer catalysts
Zucchi, Claudia,Pályi, Gyula,Galamb, Vilmos,Sámpár-Szerencsés, Ella,Markó, László,Li, Pei,Alper, Howard
, p. 3222 - 3231 (2008/10/08)
Hydroxycarbonylation of benzyl and substituted benzyl chloride and bromide derivatives was achieved in good yields (up to 97.6%) and quantitative chemoselectivity, in the presence of Co2(CO)8 as the transition metal and polyethylene
Alkylcobalt carbonyls. 10. CO activation and phase-transfer-active coordination sites in organocobalt carbonyls. Mechanism of the reaction of benzyl halides and tetracarbonylcobaltate (-I)
Haász, Ferenc,Bartik, Tamás,Galamb, Vilmos,Pályi, Gyula
, p. 2773 - 2779 (2008/10/08)
(4′-Halomethyl-1′,2′-benzo)-15-crown-5 (RX, 1; X = Cl (a), I (b)) compounds were reacted with Na-[Co(CO)4] (2). The corresponding η1-RC(O)Co(CO)4 (5), η1-RCo(CO)4 (6), and η3-RCo(CO)3 (7) derivatives were obtained through intermediates [(η5-RX)Na][Co(CO)4] (3) and [(η5-Na+)RC(O)Co(CO)3(X-)] (4). The reactions leading to 7 from 1 were found to be reversible. Derivatives of 4 and 5 were prepared by monosubstitution with PPh3, giving 8 and 9, respectively. The reversibility of the reaction of PhCH2Cl with 2 was also demonstrated.
Alkylcobalt Carbonyls. 7. (η1-Benzyl)-, (η3-Benzyl)-, and (η1-Phenylacetyl)cobalt Carbonyls
Galamb, Vilmos,Palyi, Gyula,Ungvary, Ferenc,Marko, Laszlo,Boese, Roland,Schmid, Guenter
, p. 3344 - 3351 (2007/10/02)
Benzyl- or phenylacetyl halides react with Na to yield an equilibrium mixture of (η1-benzyl)-, (η3-benzyl)-, and (η1-phenylacetyl)cobalt carbonyls.The equilibria are reversible and can be shifted by bubbling Ar or CO through the reaction mixture, resulting in enrichment of the CO-deficient and -rich derivatives, respectively.The mono-PPh3 derivatives of the η1 complexes show similar behavior.Styrenes react with HCo(CO)4 to α-methyl derivatives of the former compounds and (β-phenylpropionyl)cobalt tetracarbonyls. 2,6-Cl2C6H3CH2COCo(CO)3PPh3 (VIIh) and η1-6-(4-MeC6H4CH2)Cr(CO)3>Co(CO)4 (XIb) were characterized by X-ray crystallography as first examples of a nonfluorinated alkylcobalt tetracarbonyl and an alkylcobalt carbonyl.Complex VIIh crystallizes in a triclinic cell of dimensions a = 8.866 (2) Angstroem, b = 11.525 (4) Angstroem, and c = 14.338 (3) Angstroem, α = 74.74 (2) deg, β = 83.42 (2) deg, and γ = 80.84 (2) deg, Z = 2, space group , and R = 0.052.The molecule consists of a trigonal bipyramid with axial acyl and PPh3 groups.Crystals of compound XIb show a monoclinic cell of dimensions a = 12.365 (2) Angstroem, b = 7.031 (1) Angstroem, c = 19.656 (3) Angstroem, β = 97.68 (1) deg, Z = 4, space group P21/c, and R = 0.077.The molecule shows a trigonal-bipyramidal geometry.
