Trimethylantimony dibromide

The steps involved in the synthesis of trimethylantimony dibromide are the same as those for the preparation of trimethylantimony dichloride up to the addition of the chlorine. Instead of a gas inlet tube, an addition funnel is mounted on the flask containing the ice-cold distillate of ethyl ether and trimethylstibine. A solution of 100 g. (0.627 mol) of bromine in 500 ml. of carbon tetrachloride is added dropwise while the reaction mixture is gently stirred. The addition is stopped when the slurry remains yellowish brown. The crude material is filtered with suction on a fritted Buchner funnel and washed several times with 

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C3HgBi, Trimethylbismuth (gas-ed), 39B, 891 C3H9Br2Sb, Trimethylantimony dibromide, 6, 200, 219 C3H9ClsOPSb, Trimethylphosphine oxide - antimony pentachloride, 26, 595, 28, 95... 

Products from triphenylantimony dichloride and cephalexin show good inhibition of Balb/3T3 cells to 2 ng/mL polymers from triphenylarsenic dibromide and cephalexin exhibit cells to 50 pg/mL and those from trimethylantimony dibromide and cephalexin show good inhibition to 15 pg/mL. The structure for the triphenylantimony dichloride and cephalexin product is given below. 

Trimethylantimony dichloride, dibromide, and diiodide have been shown to consist of trigonal bipyramidal molecules with the halogens at the apices and the methyl groups in the planar positions. Although melting points have been reported for these compounds from time to time, they are not reproducible because the compounds loose methyl halide upon heating. This reaction is useful for the prepa-... 

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