55926-17-5

Upstream product

• 14515-69-6 diphenylacetylene hexacarbonyl dicobalt 
• 603-35-0 triphenylphosphine 
• 201230-82-2 carbon monoxide 

Downstream Products

• 55926-09-5 Co₂(CO)4(P(C₆H₅)3)2(C₆H₅)C₂(C₆H₅) 

Relevant academic research and scientific papers

Photochemical studies of Co2(CO)6(acetylene) complexes and their phosphine derivatives in frozen Nujol matrices

Photolysis of Co2(CO)6(alkyne), where alkyne=H2C2 (I), (C2H5)2C2 (II) (C6H5)2C2 (III) and C6H5C2H (IV) in frozen Nujol at ca. 90 K results in loss of CO to give Co2(CO)5(alkyne) in which CO-loss appears to be from the axial position. Complete conversion to a second isomer, presumed to have a vacancy in an equatorial position, or to starting material is observed for all compounds upon annealing the matrices to ca. 140 K. The second isomer is also formed by Co2(CO)5[(C6H5)2C2] upon photolysis at λ2(CO)6As2 (V), gave photochemical and annealing products whose spectra were analogous to those of the alkyne compounds. Photolysis of phosphine substituted derivatives such as axial-Co2(CO)5(PR3)(C2R′2), where R=Bu; R′=H (VI), R=Ph; R′=H (VII), R=OPh, R′=H (VIII), R=Ph; R′=Ph (M) yields two isomeric CO-loss products. Annealing samples of V-IX to ca. 140 K results in simple reaction reversal. Solution photolysis of IX with PPh3 gives Co2(CO)4(PPh3)2(Ph2C2). Photolysis of Co2(CO)4(PPh3)2(H2C2) (X) yields two products. Annealing the sample reforms the starting material and also generates a new species. Photolysis of Co2(CO)4(Ph2P)2CH2][(C2H5)2C2] (XI) forms a single product that reforms XI upon annealing.

Paramagnetic Organometallic Molecules. 13. Electron-Transfer-Catalyzed Reactions of Polynuclear Metal Carbonyls: Reactions of R2C2Co2(CO)6

Polynuclear metal carbonyls are shown to be suitable substrates for rapid electron-transfer-catalyzed (ETC) reactions that offer a new convinient method for the synthesis of many carbonyl derivatives.The factors that influence the applicability and yields of these reactions are discussed and examples with a variety of nucleophiles and substrates given.The distinction between electron-induced nucleophilic substitution (EINS) and ETC reactions is emphasized.ETC reactions of R'RC2Co2(CO)6 with MeCN and other Lewis bases using both electrolytic and chemical reductants are described in detail, in particular those where R' = R = CF3.The yields of the new products (CF3)2C2Co2(CO)5L , (CF3)2C2Co2(CO)4L2 , and (CF3)2C2Co2(CO)3L3 are virtually quantitative, with reaction times no longer than 5 min.In most cases reaction is over in 1 min at 293 K.Yields from ETC reactions with other R'RC2Co2(CO)6 compounds are variable but can be correlated with the lifetime of the radicals anions.Spectroscopic data characterized the phosphite or phosphine ligand as having an axial conformation in R2C2Co2(CO)5L complexes, but the X-ray structure of (CF3)2C2Co2(CO)5(MeCN) shows that the MeCN is equatorial.Steric factors are believed to account for this.However, the MeCN ligand is very labile in solution, and the electrochemistry of the MeCN adduct is characterized by abnormal limiting currents at 293 K that are absent at lower temperatures.The compound (CF3)2C2Co2(CO)5(MeCN) crystallizes in the space group Pna21; a = 15.794 (5) Angstroem, b = 9.803 (3) Angstroem, c = 10.936 (4) Angstroem, Z = 4, V = 1693.4 Angstroem3.