Mikrobestimmung von Carbonyl-Gruppen mit 2,4-Dinitrophenylhydrazin

Determination of Aldehydes Using Unsymmetrical Dimethylhydrezine

“…The difficulties in these methods lie in the quantitative separation of the hydrazone and drawbacks in the use of titanous chloride. Schoeniger and Lieb (27,28) determined the excess 2,4-dinitrophenvihydrazine with titanous chloride. p-Nitrophenylhydrazine has been used (24) by isolating the derivative, reducing with stannous ion, and determining the excess stannous iodometrically.…”

Use of Sodium Borohydride for Determination of 3-Ketobisnor-4-cholene-22-al

“…The conventional methods (1,5,7,8,9,11) of determining carbonyl function do not distinguish sufficiently between aldehyde and keto groups in high molecular weight compounds. In this case, the problem is particularly complex.…”

Volumetric Analytical Methods for Organic Compounds

“…A modification of the method of Schoniger and Lieb (136) has been used in the determination of methylglyoxal (124).…”