hydrogenchloride in dichloromethane standartized soln. of hydrogen chloride in CH2Cl2 (ca. 5 molar equiv) was added dropwise at -78°C, mixt. was stirred for 6-8 h, soln. was allowed to warm to room temp.; solvent was evapd., residue recrystd. from CH2Cl2/hexane (1/3); elem. anal.;

iodine; magnesium in tetrahydrofuran (N2); to suspn. of Mg and I2 at 25°C added over 1 h soln. of Br(CH2)12Br, stirred for 4 h, sepd. from excess of Mg, diluted with THF, added over 2.5 h to Sn-compd. soln. at 0°C, allowed to warm to 25°C, stirred for 10 h; satd. aq. NH4Cl added at 0°C, aq. layer extd. (ether), combined ethereal solns. washed (satd. aq. NaCl), dried (MgSO4), filtered, concd., chromd. (MeCN/THF), recrystd. (hexane or EtOH); elem. anal.;