in tetrahydrofuran byproducts: bis(trimethylsilyl) ether; the aldehyde was added by syringe at -78°C under Ar to a THF soln. of the carbanion, the mixt. was stirred 2-3 h at -78°C and allowed to warm to 25°C overnight; (Z)/(E) isomer ratio ca. 7:3 ((1)H NMR), total yield 73percent; reaction mixt. was treated with cold 2 M HCl, extd. with 5:1 Et2O-CH2Cl2, ext. washed with satd. NaCl, dried over MgSO4 and distilled; elem. anal. for isomer mixt.;

in tetrahydrofuran byproducts: bis(trimethylsilyl) ether; the aldehyde was added by syringe at -78°C under Ar to a THF soln. of the carbanion, the mixt. was stirred 2-3 h at -78°C and allowed to warm to 25°C overnight; (Z)/(E) isomer ratio ca. 7:3 ((1)H NMR), total yield 84percent; reaction mixt. was treated with cold 2 M HCl, extd. with 5:1 Et2O-CH2Cl2, ext. washed with satd. NaCl, dried over MgSO4 and distilled; elem. anal. for isomer mixt.;

in tetrahydrofuran a THF soln. of carbanion was treated at -78°C under Ar with PhCOOMe, stirred 3 h at -78°C and allowed to warm to 25°C overnight; a 10percent soln. of KH2PO4 was added at 0°C, mixt. was extd. with 5:1Et2O-CH2Cl2, washed with satd. NaCl, dried over MgSO4, distilled to give PhC(O)CH2SiMe3 containing 14percent of bis(pinacol) diborate (the latter wasidentified by (1)H NMR data);

benzophenone in tetrahydrofuran byproducts: bis(trimethylsilyl) ether; Ph2CO was added by syringe at -78°C under Ar to a THF soln. of the carbanion, the mixt. was stirred 2-3 h at -78°C and allowed towarm to 25°C overnight; reaction mixt. was treated with cold 2 M HCl, extd. with 5:1 Et2O-CH2Cl2, ext. washed with satd. NaCl, dried over MgSO4 and distilled; elem. anal.;