CH3MgI in diethyl ether 1)educts heated in sealed tube at 60°C for 4 h; 2)I2GeC5H8 added at -45°C to CH3MgI soln. in Et2O under Ar, mixt. brought to 25°C, treated with 2 M HCl under ice-cooling; 1) without isolation and purifn.; 2)org. layer sepd., dried(CaCl2), ether removed, distd.; elem. anal.;

in neat (no solvent) pyrolysis at 470°C, ca. 2 Torr in presence of 10-fold excess of 2-methylbutadiene; GC at 90°C;

in tetrahydrofuran byproducts: LiCl; Sonication; (Ar); sonication for 30 min; filtration; distn.;

in gas pyrolysis at 470°C, ca. 2 Torr in presence of 10-fold excess of 2,3-dimethylbutadiene;