Accession Number : AD0464462


Title :   NITROGEN-15 MAGNETIC RESONANCE SPECTROSCOPY. 4. THE DEGENERATE BIMOLECULAR EXCHANGE OF PROTONS IN KETIMINES


Descriptive Note : Technical rept.


Corporate Author : CALIFORNIA INST OF TECH PASADENA GATES AND CRELLIN LABS OF CHEMISTRY


Personal Author(s) : Lambert, Joseph B ; Roberts, John D


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/464462.pdf


Report Date : May 1965


Pagination or Media Count : 38


Abstract : The imine protons of nitrogen-15 labeled ketimines exhibit temperature-dependent nuclear magnetic resonances. Analysis of the effect of concentration of substrate on the mean lifetime indicates that the spectral changes result from a bimolecular exchange of protons between imines. The activation energy of this process in diphenylketimine-N15 was determined to be 13.8 = 2 kcal/mole, whereas in s-butylphenylketimine-N15, the activation energy was about 6 kcal/mole. In the latter case, separate resonances were observed for the distinct syn and anti isomers.


Descriptors :   *NUCLEAR MAGNETIC RESONANCE , *ISOTOPE EFFECT , *NITROGEN , ATOMIC ORBITALS , PROTONS , AMINES , HEAT OF ACTIVATION , ORGANIC NITROGEN COMPOUNDS , MOLECULAR ISOMERISM , CRYOGENICS , LABELED SUBSTANCES , KETONES , BASES(CHEMISTRY) , BIPHENYL , SYNTHESIS(CHEMISTRY) , SPECTROSCOPY , EXCHANGE REACTIONS , ISOTOPES


Subject Categories : Atomic and Molecular Physics and Spectroscopy


Distribution Statement : APPROVED FOR PUBLIC RELEASE