Antimony ethoxide

Transition metal antimony ethoxides of the type M2Sb4(OEt)ie (M = Mn, Ni) have been prepared 4i2 fj-om the corresponding metal chloride and NaSb(OEt)4 in 1 2 molar ratio (Eq. 3.43) and their structures have been confirmed by X-ray crystallography. 

Antimony(V) ethoxide and isopropoxide have been found to be volatile compounds these are dimeric in cyclohexane or carbon tetrachloride solutions. By contrast, the low volatility of Sb(OMe)5 has been ascribed to its polymeric nature in solid state. The antimony atom in these pentaalkoxides prefers hexacoordination state which may be acquired either by molecular association or on coordination with suitable donors such as alcohol, ammonia etc.,246,248 249,251. Antimony pentaethoxide also reacts with sodium ethoxide to give the bimetallic alkoxide, NaSb(OEt)6249). 

Preparation and properties of alkoxide halides of antimony(V) of the type (RO)nSbX5 n (n = 1-4) have been described in a number of publications24 -258. These compounds exist in dimeric form. The chloroantimony ethoxides, (EtO)nSbCl5 n, ionize in the solvents of high dielectric constants259,260 ... 

Antimony(m) ethoxide (Sb(OEt)3) promotes the intermolecular amidation of esters and carboxylic acids with amines under azeotropic conditions.47,48 When tetramino esters are used, the antimony(in)-templated intramolecular macrolactamization provides macrocyclic spermine alkaloids in good yields (Equation (14)). Under the same... 

ETHERS Antimony(V) fluoride. Hexamethylphosphorus triamide. Tetra-n-butyl hydrogen sulfate. Thallium(I) ethoxide. Triphenylphosphine-Diethyl azodicarboxylate. ETHYL KETONES Sodium tetracarbonylferratefll). 

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