Accession Number : AD0648440

Title :   FLASH PHOTOLYSIS STUDIES ON REACTIONS BETWEEN EXCITED MOLECULES AND SELECTED SUBSTRATES. SUBSTITUENT EFFECTS IN THE CIS-TRANS ISOMERIZATION ABOUT THE CARBON-NITROGEN DOUBLE BOND.

Descriptive Note : Technical rept.,

Corporate Author : UPPSALA UNIV (SWEDEN) INST OF PHYSICAL CHEMISTRY

Personal Author(s) : Claesson,Stig

Report Date : 1965

Pagination or Media Count : 18

Abstract : Ethanol solutions of N-benzylideneaniline derivatives were photoisomerized and the kinetics for the thermal relaxation was measured. This thermal reaction follows first-order kinetics and the rate constants correlate with the Hammett sigma constants. The effect of a substituent is considerably stronger when it is attached to the aniline ring than when it occupies the corresponding position on the benzaldehyde ring. This is in agreement with the non-planar model for N-benzylideneaniline, where the pi-electron system of the aniline ring interacts with the lone-pair electrons of the nitrogen atom. (Author)

Descriptors :   (*PHOTOLYSIS, CHEMICAL REACTIONS), (*MOLECULAR ISOMERISM, PHOTOCHEMICAL REACTIONS), POLYCYCLIC COMPOUNDS, ORGANIC NITROGEN COMPOUNDS, STEREOCHEMISTRY, REACTION KINETICS, MOLECULAR ORBITALS, CATALYSIS, BUFFERS, SWEDEN

Subject Categories : Organic Chemistry
      Radiation and Nuclear Chemistry
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE