STEREOSPECIFIC REACTIONS OF ARYL-TELLURIUM(IV) TRICHLORIDES WITH 3-CYCLOHEXENE-1-METHANOL AND 3-CYCLOHEXENE-1,1-DIMETHANOL - THE X-RAY CRYSTAL-STRUCTURE OF 2',4'-DIMETHOXYPHENYL(TRANS-6-OXABICYCLO[3.2.1]OCT-4-YL)TELLURIUM(IV) DICHLORIDE

Aryltellurium(IV) trichlorides react with 3-cyclohexene-1-methanol and 3-cyclohexene-1,1-dimethanol to give aryl(trans-6-oxabicyclo[3.2.1]oct-4-yl)tellurium(IV) dichlorides and aryl(cis-1-hydroxymethyl-trans-6-oxabicyclo[3.2.1]oct-4-yl)tellurium(IV) dichlorides. The structure of 2',4'-dimethoxyphenyl(trans-6-oxabicyclo[3.2.1]oct-4-yl)tellurium(IV) dichloride has been determined by single crystal X-ray analysis. The compound C15H20Cl2O3Te, M(r) = 446.8, crystallizes in the monoclinic space group P2(1)/c with a = 9.626(2) Angstrom, b = 15.768(5) Angstrom, c = 11.176(3) Angstrom, beta = 92.08(1)degrees, V = 1695.2(5) Angstrom 3, and D(calc) = 1.751 for Z = 4. Tellurium is bonded axially to two chlorines and equatorially to aryl carbon and carbon from the cyclohexyl portion of oxabicyclo[3.2.1]oct-4-yl in a pseudo-trigonal-bipyramidal arrangement having an equatorial lone pair of electrons. Bond lengths are Te-Cl(1) = 2.492(3) Angstrom, Te-Cl(2) = 2.539(3) Angstrom, Te-C(4) = 2.175(10) Angstrom, and Te-C(9) = 2.090(10) Angstrom.