1.Dimethylglyoxime was obtained by bromination of 2,4,5-trimethyl- or 2-phenyl-4,5-dimethyloxazoles in methanol and subsequent oximation.2.Chlorination of 2-phenyl-4-acyl-5-oxazolinones with sulfuryl chloride, hydrolytic cleavage of the resulting 4-chloro derivatives, and subsequent oximation of the intermediate 1-chloro-1-benzamido-2-alkanones afforded dioximes of α-keto aldehydes