in benzene all manipulations under dry Ar; heating benzene soln. of 2,3-benzo-7,7-dimethyl-1,4,5,6-tetraphenyl-7-germanorborna-2,5-diene and bis(trimethylsilyl)thioketene (70°C, 3 h); preparative GLC (10percent SF-96 on Celite 545);

CH3MgI in diethyl ether; benzene Norbornadiene-compound and PhCH2I are heated at 75°C in benzene under Ar, benzylic products (10-20 percent) are methylated in Et2O (MeMgI, stirring at 0°C for 0.5 h, then stirring at room temp. for 1 h).; addn. of H2O and NH4Cl, sepn. of organic and aq. phases, extn. of aq. phase (Et2O), removal of solvent, investigation by GC-MS anal., further products are Me8Ge3, Me10Ge4, Me12Ge5 in ca. 70 percent yield;

CH3MgI in diethyl ether; benzene Norbornadiene-compound and PhCH2I are heated at 75°C in benzene under Ar, benzylic products (10-20 percent) are methylated in Et2O (MeMgI, stirring at 0°C for 0.5 h, then stirring at room temp. for 1 h).; addn. of H2O and NH4Cl, sepn. of organic and aq. phases, extn. of aq. phase (Et2O), removal of solvent, investigation by GC-MS anal., further products are Me8Ge3, Me10Ge4, Me12Ge5 in ca. 70 percent yield;

in benzene Norbornadiene-compound and PhCH2Br are heated at 80°C for 4 h in benzene under Ar.; GC-MS anal.;

in chlorobenzene Kinetics; byproducts: C6H5CH2CH2C6H5; 7-germanarbornadiene heating with an excess of PhCH2Br in PhCl at 85°C; isolated as PhCH2GeMe3 after methylation of reaction mixt.; detected by(1)H CIDNP spectrum; permethylated deriv. identified by GC-MS anal.;

in benzene byproducts: (C10H4)(C6H5)4; 70°C; 1.5 h;; sublimation in vac.;;

in cyclohexane byproducts: 1,2,3,4-tetraphenylnaphthalene; Irradiation (UV/VIS); irradiation of soln. of Ge-compd. and butadiene (254 nm, low pressure mercury lamp);

in cyclohexane Irradiation (UV/VIS); irradn. with a low-pressure mercury lamp (254 nm) for 5h at room temp.; distn. under reduced pressure, purifn. by GLC;

CH3MgCl in diethyl ether; benzene Norbornadiene-compound and Ph2CHCl are heated at 75°C for 4 h in benzene under Ar, methylation of Ph2CHCHPh2 and Ph2CHGeMe2Cl with MeMgCl in Et2O (stirring at 0°C for 0.5 h, followed by stirring for 1 h at room temp.).; addn. of H2O and NH4Cl, sepn. of organic and aq. phases, extn. of aq. phase (Et2O), removal of solvent, identification by GC-MS anal., further products are Me8Ge3, Me10Ge4, Me12Ge5 (yield: ca 5 percent);