Indium tribromide

Indium tribromide also gives good yields, with minor isomerization to the a, 13-isomers.129... 

Indium tribromide is a white hygroscopic crystalline solid, mp 436° the vibrational spectrum suggests that each indium is surrounded octahedrally by six bromine atoms.4,s The solubility in organic solvents is similar to that for indium(IIl) chloride (see above). 

A variety of indoles 418 react smoothly with sulfonyl chlorides in the presence of a catalytic amount of indium tribromide in 1,2-dichloroethane at reflux temperature to afford the corresponding 3-arylsulfonyl indole derivatives 419 in high yields (65-95%) with high regioselectivity (Equation 101) <2003TL6055>. No N-substituted products were observed under these reaction conditions. 

The allylation of aldehydes has recently been more extensively studied using a macroporous polystyrene as support and could be achieved at 60 °C in acetonitrile using CeCb. 7H20/10% Nal as promoter when an allyl or methallyl unit were involved. When indium tribromide was used as a promoter, the reaction took... 

When D-glucal is treated with 10 mol% InCl, 3H2O in acetonitrile the chiral furan diol is obtained. n-Galactal also undergoes transformation to the same product (Scheme 8.129) [172]. Indium tribromide and trichloride efficiently catalyze the chemoselective fhioacetalization of carbonyl compounds (Scheme 8.130) [173]. 

HfCI4[g] HAFNIUM TETRACHLORIDE (GAS) 815 lnBr3 INDIUM TRIBROMIDE 850... 

C9H,6Br3lnN02 2,2,6,6-T etramethyl-4-piperidone 1 -oxide indium tribromide Nr.lO,X = InBr3 Chemical synthesis from stable components/ Nonaqueous EPR/ 300 N 1.94(7) In 4.48 (7) 72Abal... 

C9H,6BrjInN02 2.2.6.6- T etramethy 1-4-piperidone 1 -oxide indium tribromide follows C9H,jGal3N02 C9H,6l3lnN02 2.2.6.6- T etramethyl-4-piperidone 1-oxide indium triiodide follows C9H,6Br3lnN02 ... 

Shibata I, Mitani I, Imakuni A, Baba A (2011) Highly efficient synthesis of cyclic carbonates from epoxides catalyzed by indium tribromide system. Tetrahedron Lett 52 721-723... 

Reductive hromination of carboxylic acids to alkyl halides has been accomplished using 1,1,3,3-tetramethyldisiloxane (TMDS) and trimethyl-bromosilane (TMBS) in the presence of an indium tribromide catalyst. The reaction occurs in high yield in the presence of a variety of functionality [79]. 

Sakai N, Annaka K, Konakahara T (2004) Palladium-catalyzed coupling reaction of terminal alkynes with aryl iodides in the presence of indium tribromide and its application to a one-pot synthesis of 2-phenylindole. Org Lett 6 1527-1530. doi 10.1021/ol036499u Sakai N, Annaka K, Eujita A, Sato A, Konakahara T (2008) InBr 3-promoted divergent approach to polysubstituted indoles and quinolines from 2-ethynylanilines switch from an intramolecular cyclization to an intermolecular dimerization by a type of terminal substituent group. J Org Chem 73 4160-4165. doi 10.1021/jo800464u... 

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