H2O in tetrahydrofuran a Ge-contg.-compd. was added to a mixt. of tri-tert-butylcyclopropenyl tetrafluoroborate (15.5 mmol) and THF at 0°C; after stirring at 0°C for 1 h, the mixt. was hydrolyzed with water; org. layer was sepd., aq. layer was extd. with hexane; org. layer and exts. were combined, washed with H2O and brine, dried, filtered; filtrate was concd. under reduced pressure; residue was chromd. on silica gel (hexane as eluent), concd.; elem. anal.;

in tetrahydrofuran; hexane byproducts: LiBF4; under Ar, Schlenk technique; mixt. of Ph3GeBr and Li in THF stirred at room temp. for 6 h, soln. added to cyclopropenium salt in hexane at 0°C, mixt. stirred at room temp. overnight; chromy. (silica gel, hexane); elem. anal.;

1: tetrahydrofuran 2: H2O / tetrahydrofuran View Scheme