113809-75-9

Basic information

• Product Name: Ti(η4-tetraphenylcyclobutadiene){(μ-Br)2(AlBr2)}2
• CAS NO: 113809-75-9
• Molecular Weight: 1097.54
• Mol File: 113809-75-9.mol
• Article Data: 1

Chemical Properties

• CAS DataBase Reference: Ti(η4-tetraphenylcyclobutadiene){(μ-Br)2(AlBr2)}2(CAS DataBase Reference)
• NIST Chemistry Reference: Ti(η4-tetraphenylcyclobutadiene){(μ-Br)2(AlBr2)}2(113809-75-9)
• EPA Substance Registry System: Ti(η4-tetraphenylcyclobutadiene){(μ-Br)2(AlBr2)}2(113809-75-9)

Safety Data

• Hazardous Substances Data: 113809-75-9(Hazardous Substances Data)

Upstream product

• 501-65-5 diphenyl acetylene 
• 7789-68-6 titanium(IV) bromide 
• 7429-90-5 aluminium 

Downstream Products

• 39475-28-0 Ti(η4-C4Ph4)(COT) 

Relevant articles and documents

Reactivity of Titanium(II) Arene Derivatives with Substituted Alkynes. Cyclooligomerization Reactions and Crystal and Molecular Structure of 4-C4(C6H5)4>Ti2

By treating Ti(η6-toluene)2 (X = Cl: 1a, X = Br: 1b) with C2R2 (R = Me, Ph) tetraorganylcyclobutadiene complexes of formula Ti(η4-C4R4)2 (R = Ph, X = Cl: 2a, X = Br: 2b; R = Me, X = Br: 3b) have been obtained in good yields.Compound 2b has been studied by X-ray diffraction methods.The titanium atom possesses an approximate square pyramidal coordination, the apical position being occupied by the symmetrically bonded tetraphenylcyclobutadiene ring, the four bridging bromides to the two AlBr2 groups forming the base of the pyramid, 0.99 Angstroem away from the titanium atom.The tetrabromoaluminato moiety of 2b can be substituted by carbocyclic anionic ligands, such as Cp and COT, and the corresponding complexes 4 and Ti(4h4-C4Ph4)(COT) were obtained.The spectroscopic study of the Ti(η6-benzene)2/diphenylacetylene (DPA) system (X = Cl: 5a, X = Br: 5b) has revealed the existence of three products, corresponding to the 1:1, 1:2, and 1:3 molar ratios.The possible role of the known AlX3 * C4R4 complexes in this reaction is discussed.The cyclotrimerization reactions of substituted acetylenes in the presence of η6-arene titanium(II) complexes as precursors have been studied.In toluene or methylcyclohexane Ti(η6-toluene)2 was found to catalyze the formation of alkyl-substituted aromatic hydrocarbons from 2-butyne, phenylacetylene, and 1-hexyne at about 80 deg C over 15 h with turnovers (moles of converted alkyne per mole titanium) of about 520, 900, and 990, respectively.The cyclooligomerization of DPA in the presence of Ti(η6-benzene)>(μ-X)2(AlX2)>2 (X = Cl, Br) was studied in detail.The activity of the chloro derivative 5a is higher than that of the bromide catalytic precursor 5b.In addition to hexaphenylbenzene and octaphenylcyclooctatetraene, other oligomerization by-products (triphenylethylene, 1,1,2,2-tetraphenylethane, 1,2,3-triphenylnaphthalene, and 1,2,3-triphenylazulene) were observed, whose formation was drastically reduced in the presence of alkyl aluminium halides. - Key Words: Titanium / Cyclooligomerization / Acetylenes, substituted / Tetraphenylcyclobutadiene, ligand