Cryoscopic studies of amides in benzene

✍ Scribed by A.K. Sharma; P.P. Rastogi

• Publisher: Elsevier Science
• Year: 1981
• Weight: 227 KB
• Volume: 19
• Category: Article
• ISSN: 0378-4487
• DOI: 10.1016/0378-4487(81)80042-8

✦ Synopsis

Molal freezing point depression(ATf) of N-methylformamide(NMF), N-methylacetamide(NMA), N-methylpropionamide, N:N-dimethylformamide(DMF), N:N-dimethylacetamide (DMA) and N:N-dimethylpropionamide(DMP) have been determined in benzene by cryoscopic measurements. Molecular weight, degree of association and equilibrium constant have been evaluated from these results. The observed deviations from linear behaviour in AT: versus concentration plots appear to indicate the existence of MONOMER--DIMER equilibrium at almost all concentrations for NME', NMA and NMP compared with the normal linear feature for DMF, DMA and DMP, a novelty which can be explained in terms of hydrogen bonding and which supports our previous conclusions [l] drawn from dielectric measurements.