methylhalogenide chromy.;

in tetrahydrofuran under N2, C3H5Br added to soln. of Sn-compd. in THF; modified from Kunze, U.; Bolz, P.-R.; Winter, W. Chem. Ber. 1981, 114, 2744; evapd. to dryness, extd. with petroleum ether, vol. reduced by evapn., washed with hexane;