NC N= NCO, Me A 97 (10a/10b 0= 58/42) c 1 23d 70 (10c/10d= 76/24) a All yields are absolute, employing biphenyl and/or cyclohexanone as an internal standard on an Aerograph A-90-P gas chromatograph, 3/8 in. x 20 ft, 2Oz SE-30 on Chromosorb W (45-60 mesh) column.* Distilled yield based on ketone. c Not routinely separable by glc; nmr shows two methyl doublets (-5Oj50). A mixture of diastereomers by glc.
