Facile alkyne coupling reactions in dirhenium carbonyl complexes

1993 ◽  
Vol 12 (5) ◽  
pp. 1623-1628 ◽  
Author(s):  
Richard D. Adams ◽  
Linfeng Chen ◽  
Wengan Wu
Keyword(s):  
Coupling Reactions ◽  
Carbonyl Complexes ◽  
Alkyne Coupling

Alkyne−Alkyne Coupling Reactions with W(CO)(PhC⋮CPh)3and W(NCMe)(PhC⋮CPh)3

1997 ◽  
Vol 16 (12) ◽  
pp. 2698-2708 ◽  
Author(s):  
Wen-Yann Yeh ◽  
Chi-Lin Ho ◽  
Michael Y. Chiang ◽  
I-Ting Chen
Keyword(s):  
Coupling Reactions ◽  
Alkyne Coupling

scholarly journals Alkene-Directed, Nickel-Catalyzed Alkyne Coupling Reactions.

ChemInform ◽  
2004 ◽  
Vol 35 (31) ◽  
Author(s):  
Karen M. Miller ◽  
Torsak Luanphaisarnnont ◽  
Carmela Molinaro ◽  
Timothy F. Jamison
Keyword(s):  
Coupling Reactions ◽  
Alkyne Coupling

Hydrido(acylenolato)cobalt(III)-Verbindungen mit Trimethylphosphan- Liganden: Insertionsreaktionen mit Alkinen und die ersten Carbonylcobalt(III)-Komplexe / Hydrido(acylenolato)cobalt(III) Compounds Containing Trimethylphosphane Ligands: Insertion Reactions with Alkynes and the First Carbonylcobalt(III) Complexes

2000 ◽  
Vol 55 (8) ◽  
pp. 707-717 ◽  
Author(s):  
Hans-Friedrich Klein ◽  
Xiaoyan Li ◽  
Ulrich Flörke ◽  
Hans-Jürgen Haupt
Keyword(s):  
Axial Position ◽  
Coupling Reactions ◽  
Carbonyl Complexes ◽  
Ambient Conditions ◽  
X Ray Diffraction ◽  
Insertion Reactions ◽  
X Ray ◽  
Reversible Transformation ◽  
Tert Butyl ◽  
Trigonal Bipyramidal

Abstract Formal insertion of phenylethyne into Co-H functions of mer-octahedral acyl(enolato)-cobalt(III) hydrides 1-3 proceeds under ambient conditions affording η1-vinylcobalt(III) compounds where the dianionic acyl(enolato) ligands are derived from 2-formyl-4-phenyl-cyclohexanone (4), 1-formyl-cyclohexan-2-one (5), and 3-hydroxo-2,3-diphenyl-propenal (6). Dissociation and association of trimethylphosphane results in a reversible transformation of penta-coordinate complexes 4 -6 into hexa-coordinate ones 7 -9, respectively, involving different tautomeric vinyl species. In toluene solution 9 rearranges by reductive C,C coupling into a 5,6-η2-olefin(enolato)cobalt(I) complex 10. Trimethylsilylethyne undergoes a hydrolytic desilylation reaction which is followed by reductive C,C-coupling reactions of acyl and vinyl functions selectively producing chelating η1-enolato-5,6-η2-olefin ligands in cobalt(I) com ­ pounds 13 -16 where the (ax,eq)chelating ligands are derived from 1-formyl-cyclohexan-2-one (13), 3-hydroxo-2,3-diphenyl-propenal (14), 2-formyl-α-tetralone (15), and 2-formyl-4-tert-butyl-cyclohexanone (16). An axial position of the enolato-O donor in the trigonal bipyramidal configuration of complex 15 has been confirmed by X-ray diffraction analysis. With 1,4-bis(trimethylsilyl)buta-diyne 1,2-addition in cobalt(III) hydrides 2, 3, 11 (as deriverd from 2-formyl-α-tetralone), and 12 (as derived from 2-formyl-4-tert-butyl-cyclohexanone) produces 2-metalated vinyl groups in compounds 17 -20. Dissociation of trimethylphosphane from 17 and 19 does not activate C,C coupling at the cobalt(III) centre of penta-coordinate 21 and 22. Steric congestion in compounds 17, 18, and 20 favours exchange of trimethylphosphine for carbon monoxide affording the first octahedral carbonyl complexes of cobalt (d6) (23 -25). In the crystal and in solution a meridional configuration is adopted by complex 23 with the CO group in a position opposite to the acyl function.

Alkene-Directed, Nickel-Catalyzed Alkyne Coupling Reactions

2004 ◽  
Vol 126 (13) ◽  
pp. 4130-4131 ◽  
Author(s):  
Karen M. Miller ◽  
Torsak Luanphaisarnnont ◽  
Carmela Molinaro ◽  
Timothy F. Jamison
Keyword(s):  
Coupling Reactions ◽  
Alkyne Coupling
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