Journal of Agricultural Research . for one of acrolein; whereas for theformation of glyceric aldehyde, methyl glyoxal, oxyacrolein, malonicdialdehyde, or epihydrin aldehyde, one molecule of hydrogen peroxidwould suffice; and for the formation of mesoxaldialdehyde three wouldbe needed. Without considering for the present a large number of morecomplicated reaction products that might conceivably be formed, thesesubstances were examined as to their behavior in the Kreis test, so far aspracticable or desirable. H H I I H—C ^/ H—C—O ^/ H—C=0 H—C=0 Acrolein Acrolein peroxid H H H IH—C—OH H—C H—O H—C
Journal of Agricultural Research . for one of acrolein; whereas for theformation of glyceric aldehyde, methyl glyoxal, oxyacrolein, malonicdialdehyde, or epihydrin aldehyde, one molecule of hydrogen peroxidwould suffice; and for the formation of mesoxaldialdehyde three wouldbe needed. Without considering for the present a large number of morecomplicated reaction products that might conceivably be formed, thesesubstances were examined as to their behavior in the Kreis test, so far aspracticable or desirable. H H I I H—C ^/ H—C—O ^/ H—C=0 H—C=0 Acrolein Acrolein peroxid H H H IH—C—OH H—C H—O H—C—O—H I II -i- I -> I or C=0 H—C H—O H—C—O—H I [—C=0 H—C=0 H—C=0 H—C—OH IH Glyceric Dihydroxy- aldehyde acetone H H H I I H—C=0 H—C—OH i H—C „\ H—C—H I II H—C •-a II + )0=0 -^ or H—C—H or H—C or I >0 -f-H,0 C=0 I I TT—Cy HH/ H—C ^^^ C=0 I I H—C I I H—C=0 H—C=0 I H—C=0 H—C=0 H—C =0 Methyl Malonic Oxacrolein Epihydrin glyoxal dialdehyde aldehyde. Mesoxaldialdehyde. Glyceric aldehyde;.—The condensation reaction between glycericaldehyde and phloroglucin has already been studied by Wohl and Neu-berg (45). According to these authors, the only product that is formed,with any degree of readiness at least, is a white, crystalline substance,insoluble in water and fairly easily formed in aqueous solutions of thereagents even when condensing agents are not employed. While thepossible presence of glyceric aldehyde in rancid coconut oil has been60379—24 2 340 Journal oj Agricultural Research voi. xxvi, no. s suggested by Walker {40), it is evidently not responsible for the reactionof rancid fats in the Kreis test, nor identical with substance K. DiHYDROXYACETONE.—In most of the reactions leading to the forma-tion of glyceric aldehyde the isomeric dihydroxyacetone is also is said to yield brilliant colors with phloroglucin in presence of concen-trated sulphuric acid. It was prepared by the
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