Abstract
A series of crystalline complexes of all-trans-vitamin A aldehyde were formed with some phenolic compounds, such as pyrocatecol or o-cresol. Every of these complexes is different from any of similar ones described in the claims of Eastman Kodak's patents, the former having been consisted of equi-moles of vitamin A aldehyde and phenolic compounds. The binding ability of the complexes obtained in this study was so loose that it was easily capable to separate into two components by paper chromatography of calcium paper chromatographic technique or even by washing their ether solution with alkali.
