DETERMINATION OF STABILITY-CONSTANTS OF INTERMEDIATES BY COORDINATIONCAPILLARY GLC - CHIRAL COMPLEXES OF NI-II AND CU-II WITH SCHIFFS BASES -BIS(3'-TERT-BUTYLSALYCILIDENE)DIAMINO-CYCLOHEXANE AND .2]PARACYCLOPHANYL)-5-METHYLENE]DIAMINOCYCLOHEXANE AS GLC PHASES

Chiral Ni-II and Cu-II salen complexes dissolved in the polymethylphen ylsiloxane phase OV-17 were used as the phases for capillary chromatog raphy. Chiral salen ligands are Schiff's bases obtained from salicylal dehyde (SA) and (1R,2R)-diaminocyclohexane and Schiff's bases obtained by condensation of (1R,2R)- or (1S,2S)-diaminocyclohexane with (R)-4- hydroxy-5-formyl[2.2]paracyclophane (HFPC). The stability constants of the intermediates were calculated from the retention times. The compl exes based on HFPC are stronger Lewis acids than those based on SA. Th e ability of the substrates to form intermediates decreases in the seq uence: aromatic aldehydes > halogen-substituted aromatic compounds > h alogen-substituted aliphatic compounds.