7119 Table 11. Reaction of terr-Butylmagnesium Chloride with Benzophenone Grignard prepared in excess
Magnesium Duritvd
ExDt
sc
15 16 17 18 19 20 21 22 23 24
t-BuC1 Mg Mg Mg t-BuC1
GGT GGT GGT
sc GGT sc sc sc sc
t-BuC1 t-BuClb t-BuC1 t-BuClC
Solvent
Grignard concn ( M )
Ether Ether Ether Ether Ether Ether THF THF HMPA HMPA
0.188 0.188 0.188 0.230 0.033 0.188 0.208 0.188 0.188 0.188
z
%
74
G/K ratio
1,6-addition
1,2-addition
benzopinacol
1.5
48.0 50.0 48.5 50.0 43.8 49.1 41.3 47.4 26.0 20.8
42.3 40.3 40.7 42.2 31.2 38.2 47.0 45.3 72.3 77.8
9.7 9.7 10.8 8.8 25.0 12.7 11.7 7.3
