Comparative investigation of the photoisomerization of the protonated and unprotonated n-butylamine Schiff bases of 9-cis-, 11-cis-, 13-cis-, and all-trans-retinals
On the thermal behavior of Schiff bases of retinal and its analogs: 1,2-dihydropyridine formation via six-.pi.-electron electrocyclization of 13-cis isomers