in tetrahydrofuran diketone and Ge comp. (1 mmol) were mixed, soln. was kept at 20°Cfor 2 h, then hydrolyzed; mixt. was extd. with ether, dried on Na2SO4, solvent was removed in vac.; NMR, GC;

in THF-d8 (tetrahydrofuran-d8) Irradiation (UV/VIS); soln. was irradiated for 12 h at room temp.; mixt. was analyzed by GC, NMR, MAS;

in tetrahydrofuran diketone and Ge comp. (1 mmol) were mixed, soln. was kept at 20°Cfor 2 h, then hydrolyzed; mixt. was extd. with ether, dried on Na2SO4, solvent was removed in vac.; NMR, GC;

in tetrahydrofuran diketone and Ge comp. (1 mmol) were mixed, soln. was kept at 20°Cfor 2 h, then hydrolyzed; NMR;

in tetrahydrofuran diketone and Ge comp. were mixed, soln. was refluxed for 6 h, then hydrolyzed; mixt. was extd. with ether, dried on Na2SO4, solvent was removed in vac., mixt. was extd. with ether, ether was evapd. under N2, residue was extd. with C6D6, solvent was evapd. under vac.; NMR, MAS, IR;

in tetrahydrofuran diketone and Ge comp. were mixed, soln. was refluxed for 6 h, then hydrolyzed; mixt. was extd. with ether, dried on Na2SO4, solvent was removed in vac., residue was dissolved in ether, soln. was slowly evapd. under N2; NMR,GC;

HCl in THF-d8 (tetrahydrofuran-d8) Irradiation (UV/VIS); soln. was irradiated for 12 h at room temp., then mixt. was hydrolyzed by 2N HCl; mixt. was extd. with ether, then residue was analyzed by GC, GC/MAS;

in not given mixt. of Ge comp. and diketone was kept for 6 h at 20°C, then heated in Carius tube at 100°C for 6 h; mixt. was analyzed by GC, GC/Mas;