Gas chromatographic retention indices for the N-methyl-N-substituted benzamides on capillary columns

Abstract

Gas chromatographic retention indices (1) for series of 20 synthesized N-methyl-N-substituted benzamides on DB-I, DB-5 and DB-WAX capillary columns isothermal at 170, 190 and 210 degreesC, and using temperature programmed gas chromatography (TPGC) have been determined within standard deviation of 0.6 i.u. The isothermal data obtained on these columns and TPGC data are compared and a comparison of the retention indices, DeltaI and dI/dT values presented as linear regression equations with correlation coefficient greater than 0.9970 within standard deviation of 0.6 i.u. The best resolution of the structural isomers is obtained using DB-1 capillary column.