hydrogenchloride in acetone 0.20 g in acetone was treated with a mixture (3 ml) of conc. HCl and an equal volume of water; stirring 15 min. at 60 °C; extraction (CH2Cl2); organic layer was separated, washed and evaporated;;

in tetrachloromethane; dichloromethane solution of ICl (1.32 mmol) in CCl4 was added dropwise (0,5 h) to a stirred solution of tin compound (1.26 mmol) in 1/4 CH2Cl2/CCl4 at room temperature; reaction was monitored by (1)H-NMR spectroscopy; solvent was removed under reduced pressure; pink residue kept under vacuum for 3 h; product was identified by comparison of its spectra with an authentic sample;

in tetrahydrofuran; diethyl ether under dry nitrogen; a THF solution of TsiLi was added with stirring (0,5 h) to a 1/3 THF/Et2O mixture of tin compound at room temperature; 1 h reflux;; solvent removed; extraction (CH2Cl2); extract was filtered and evaporated; residue was recrystd. (MeOH); elem. anal.;

byproducts: CO2, CCl2; 150°C;

150°C;

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in tetrahydrofuran; acetone byproducts: LiCl; reflux 1 h;; solvent was removed; residue extracted wit CH2Cl2; filtration; evaporation; elem. anal.;

in tetrachloromethane Ar-atmosphere; dropwise addn. of ICl to equimolar amt. of Sn-compd.; solvent removal (after 30 min), recrystn. (hexane);