Hz), 3.65 (5, 2), 1.76 ppm (d, 3). comparable yields to the ketone by neutralization and extraction of the oxalic acid solution. It was subsequently found that the N-methyl salts 9 need not be prepared in a separate operation, but may be obtained, ready for use, by formation in the same reaction vessel in which the Grignard addition is carried out (Experimental Section). Thus, the aim of the study was achieved not by a Lewis acid ...
