in tetrahydrofuran PhCOCl was added to a THF soln. of Zn-enolate at 0°C under N2, mixt. was stirred for 10 min; satd. aq. NH4Cl added, mixt. was partitioned between H2O and ether, aq. layer was extd. with ether, org. phases were washed with brine, dried, evapd., chromd. on SiO2 (hexane-ethyl acetate); (1)H NMR spectrum and m.p. in agreement with those reported;

methanol in benzene-d6 complete conversion after 10 min at 25°C under N2 ((1)H NMR data);

in benzene-d6 4 d, 45°C, under N2; equil. reaction, t-BuC(OZnEt)=CHMe to t-BuC(O)Et ratio 1.5:1 ((1)H NMR data);

in benzene-d6 complete conversion after 40 min at 25°C under N2;

in benzene-d6 sealed NMR tube, under N2, 25°C, 88 h; equil. reaction, t-BuC(OZnEt)=CHMe to t-BuC(O)Et ratio 1.1:1 ((1)H NMR data);