in tetrahydrofuran; anhydrous butyl ether Flash chromy. (hexane/ether, 4/1).;

in decalin

in tetrahydrofuran stirring Cr-complex with excess BH3 at 0°C, warming to room temp., stirring for 1 h; chromy.;

catalyst: butyl acetate in decalin byproducts: CO; refluxing for 6 h (catalyst: butyl acetate); freezing out at -18°C or quick chromy. of the decaline soln. on a SiO2 column;

in neat (no solvent) in autoclave;;

in 1,4-dioxane refluxing (according to Mahaffy, C. A. L.: Synth. React. Inorg. Metal-Org. Chem. 14 (1984) 679);

in decalin (Ar); refluxed a soln. of Cr-compound and dimethyl fumarate in decalin for 24 h at 180°C; filtration; evapn.; chromy. (silica gel/pentane/diethyl ether); (1)H NMR; IR; MS;

iodine; HMPT in tetrahydrofuran 2-Lithio-2-methyl-1,3-dithiane in THF was treated with Cr(CO)3C10H12 and HMPT (stirring, -78°C, 1.5 h). The mixt. was warmed to 0 °C, stirred (4 h), and then cooled to -78 °C. I2 in THF was added, and the soln. warmed to room temp.; Work-up gave an oil. Sepn. by PLC (hexane/ether,9/1). Spect. identification.;