75374-50-4

Upstream product

• 109586-38-1 Cp₂Zr(C₄H₆)(OC)Co(CO)Cp 

Downstream Products

• 11106-18-6 Cp₂Zr(N=CPh₂)2 
• 139705-59-2 (C₅H₅)2Zr((NC(C₆H₅)CH₂CH)2) 
• 139705-57-0 (C₅H₅)2Zr(NHC(C₆H₅)CHCH(CHCH₂)) 
• 126329-21-3 {carbonylbis(pentafluorophenyl)platinum}bis(cyclopentadienyl){μ-{(1,2,3-η:5-η)-5-oxo-2-pentene-1,5-diyl-O}}zirconium*CH3C6H5 

Relevant academic research and scientific papers

Cobalt carbene complexes from (butadiene)zirconocene and (cyclopentadienyl)cobalt carbonyls: An example of a nonnucleophilic synthesis of Fischer-type carbene complexes

The (s-cis-/s-trans-η4-butadiene)zireonocene equilibrium mixture (17/15 = 55/45) reacts with CpCo(CO)2 at ambient temperature to give the metallacyclic Fischer-type carbene complex Cp2Zr(C4H6) (OC=)Co(CO)Cp, 20. The (s-trans-diene)metallocene complex reacts much faster with the metal carbonyl than the more nucleophilic (s-cis-C4H6) ZrCp2 isomer. The product of this nonnucleophilic carbene complex forming reaction, 20, was characterized by X-ray diffraction. It crystallizes in the space group P21/c with cell constants a = 7.824 (2), b = 15.753 (4), and c = 15.121 (3) A? and β = 99.26 (2)°. Complex 20 is characterized by a rather short Co-C(carbene) bond length of 1.815 (4) A?. At ambient temperature in solution 20 rapidly equilibrates with the starting components Cp2Zr(butadiene) and CpCo(CO)2. At equilibrium the carbene complex is favored by 85/15. Substitution of a Cl on the Cp ring of the CpCo moiety shifts the equilibrium ratio further to the side of the zirconoxycarbene complex: (η5-C5H5)2Zr-(C 4H6)(OC=)Co(CO)(η5-C5H 4Cl) ? Cp2Zr(butadiene) + (η5-C5H4Cl)Co(CO)2 (>98/2).