Stereoisomerization of cis-1,4-dihydro-1,4-dimethyl-1,4-diarsininetetracarboxylic acid diimides, which were prepared from cis-1,4-dihydro-1,4-diarsininetetracarboxylic acid dianhydride with n-dodecylamine or aniline, to trans-isomers in CDCl3 proceeded at room temperature and quantitatively by repeated concentration and dissolution process in various solvents such as CHCl3, toluene, and ethyl acetate. Two stereoisomers were isolated respectively as single crystals, of which structures were determined by X-ray crystallography.
Stereoisomerization of cis-1,4-dihydro-1,4-dimethyl-1,4-diarsininetetracarboxylic acid diimides, which were prepared from cis-1,4-dihydro-1,4-diarsininetetracarboxylic acid dianhydride with n-dodecylamine or aniline, to trans-isomers in CDCl3 proceeded at room temperature and quantitatively by repeated concentration and dissolution process in various solvents such as CHCl3, toluene, and ethyl acetate. Two stereoisomers were isolated respectively as single crystals, of which structures were determined by X-ray crystallography.