in tetrahydrofuran excess I2; drying in vac., identification by comparison with authentic samples;

in tetrahydrofuran 1 equiv. I2, stirring for 1h; drying in vac., identification by comparison with authentic samples;

carbon monoxide; hydrogen in tetrahydrofuran (N2), CO/H2 (1:1), in an autoclave, mixture heated at 70°C for 3.5 h, cooled, gases vented; filtered, solvent removed (reduced pressure), hexane added, filtered, solvent removed, IR, NMR, mass spectra;

in tetrahydrofuran excess Br2; drying in vac., identification by comparison with authentic samples;

in tetrahydrofuran excess Br2; drying in vac., identification by comparison with authentic samples;

carbon monoxide; hydrogen in tetrahydrofuran (N2), CO/H2 (1:1), in an autoclave, mixture heated at 70°C for 3.5 h, cooled, gases vented; filtered, solvent removed (reduced pressure), hexane added, filtered, solvent removed, IR, NMR, mass spectra;