| 摘要 |
1,270,579. Dihydroxy-1,4-dioxane derivatives. FUJI PHOTO FILM CO. Ltd. 12 Aug., 1969 [17 Aug., 1968], No. 24995/70. Divided out of 1,270,578. Heading C2C. Novel dihydroxy-1,4-dioxane derivatives of the general formula wherein A represents and R 1 and R 2 are alkyl, haloalkyl, alkoxyalkyl aryl or aryloxyalkyl groups, or R 1 is a hydrogen atom, and Z is a substituted or unsubstituted saturated or unsaturated carbocyclic ring, are prepared by reacting a 1,2 dihydroxy alkane compound containing the atoms A above with glyoxal either with heating or in the presence of a desiccant under reduced pressure. The reaction is preferably carried out using an aqueous solution of glyoxal and phosphorous pentoxide as the desicant. Examples describe the preparation of derivatives wherein the dihydroxy compound is 3-chloro-1,2-propanediol, 1,2 - octanediol, 1,2 - octadecanediol, 1,2- propanediol, 2,3 - butanediol, 2,3 - pentanediol, 1,2 - dodecanediol, 3 - n - butoxy - 1,2 - propanediol, 3 - n - dodecyloxy - 1,2 - propanediol, 2- phenyl - 1,2 - ethanediol, 3 - phenoxy - 1,2- propanediol, catechol and 4-tert. butyl catechol. The compounds may be used as hardeners for photographic materials. |
