中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | (Z)-[5-(2-hydroxyethyl)-4-oxothiazolidin-2-ylidene]-1-phenylethanone | 728929-64-4 | C13H13NO3S | 263.317 |
—— | (E)-2-bromo-2-(5-ethoxycarbonylmethyl-4-oxothiazolidin-2-ylidene)-1-phenylethanone | 1246177-48-9 | C15H14BrNO4S | 384.25 |
—— | (Z)-(5-ethoxycarbonylmethyl-4-oxothiazolidin-2-ylidene)-2-bromo-1-phenylethanone | 285133-45-1 | C15H14BrNO4S | 384.25 |
Configurational isomerization of stereo-defined 5-substituted and unsubstituted 2-alkylidene-4-oxothiazolidines 1 in the solid state, giving the Z/E mixtures in various ratios, was investigated by 1H-NMR spectroscopy, X-ray powder crystallography and differential scanning calorimetry (DSC). The Z/E composition can be rationalized in terms of non-covalent interactions, involving intermolecular and intramolecular hydrogen bonding and directional non-bonded 1,5-type S...O interactions. X-Ray powder crystallography, using selected crystalline (Z)-4- oxothiazolidine substrates, revealed transformation to the amorphous state during the irreversible Z ? E process. A correlation between previous results on the Z/E isomerization in solution and now in the solid state was established.