SYNTHESIS AND THERMAL-DECOMPOSITION OF DERIVATIVES OF ACYLOXYTETRAPHENYLANTIMONY

Acyloxy derivatives of tetraphenylantimony of the general formula Ph(4 )SbOC(O)R (R = Alk or Ar) have been synthesized by the reaction of pen taphenylantimony with carboxylic acids. Thermolysis of the compounds o btained affords phenyl carboxylates and triphenylstibine in quantitati ve yields. One of these compounds (R = CH=CHPh) has been studied by X- ray structural analysis. In this compound, the Sb atom has a trigonal- bipyramidal coordination. The Sb-O(Ph)(eq) distances are in the range 2.103(4)-2.140(5) Angstrom; the Sb-C(Ph)(ax) bond length is 2.167(5) A ngstrom. The fragment of the residue of cinnamic acid has a delocalize d double bond in the carboxylate group.