1: With 1,1-dimethylethylmagnesium chloride in tetrahydrofuran T=-45°C; Inert atmosphere; 2: With isopropylmagnesium chloride in tetrahydrofuran T=-45 - 20°C; Inert atmosphere;
Kanemoto, Shigekazu; Morizawa, Yoshitomi; Oshima, Koichiro; Nozaki, Hitosi
Bulletin of the Chemical Society of Japan, 1982 , vol. 55, # 12 p. 3941 - 3942