142746-93-8

Basic information

• Product Name: pentacarbonyl{3-ethoxy-2-methyl-4,4-diphenyl-2-cyclobuten-1-ylidene}tungsten
• CAS NO: 142746-93-8
• Molecular Weight: 586.253
• Mol File: 142746-93-8.mol
• Article Data: 2

Chemical Properties

• CAS DataBase Reference: pentacarbonyl{3-ethoxy-2-methyl-4,4-diphenyl-2-cyclobuten-1-ylidene}tungsten(CAS DataBase Reference)
• NIST Chemistry Reference: pentacarbonyl{3-ethoxy-2-methyl-4,4-diphenyl-2-cyclobuten-1-ylidene}tungsten(142746-93-8)
• EPA Substance Registry System: pentacarbonyl{3-ethoxy-2-methyl-4,4-diphenyl-2-cyclobuten-1-ylidene}tungsten(142746-93-8)

Safety Data

• Hazardous Substances Data: 142746-93-8(Hazardous Substances Data)

Upstream product

• 131685-40-0 [(CO)5W(C(C(C₆H₅)2)N(C₆H₅)CHC₆H₅)] 
• 628-33-1 3-ethoxy-1-propyne 
• 14273-06-4 1-ethoxy-1-propyne 

Relevant articles and documents

Unprecedented formation of azulenylidene ligands by reaction of the vinylidene ligand in arylvinylidene pentacarbonyl complexes of chromium and tungsten with alkoxyacetylenes

Arylvinylidene(pentacarbonyl)chromium and -tungsten complexes [(CO) 5M=C=C(C6H4R1-p)R2] (M = Cr, W; R1 = H; R2 = Me, C6H4R 3-p [R3 = H, Me, OMe, Cl, tBu]; R1 = Me; R2 = C6H4Cl-p) react with alkoxyacetylenes, HC≡COR′ (R′ = Et, tBu, adamantyl), by 1,3-addition of the CC triple bond to the vinylidene ligand and ring expansion to give azulenylidene complexes [(CO)5M=C-CH= C(OR′)-C(CR)=CHCH=C(R)CH=CH]. When monosubstituted and unsymmetrically bis-substituted bis(aryl)-vinylidene complexes are employed, mixtures of two isomers are obtained. In the two isomers the substituent either is attached to the seven-membered ring or resides in the para position of the phenyl group. In general, the selectivity of the reactions is low; the isomeric ratio varies between 0.5 and 2 depending on the metal and the substituent. DFT calculations on the reaction mechanism indicate that the reactions are initiated by a nucleophilic addition of the terminal carbon atom of the alkoxyacetylene to the metal-bound Cα atom of the vinylidene ligand. The low selectivity of the reactions is in accord with the results of the calculations. The structure of several azulenylidene complexes was established by X-ray structure analyses.