Abstract Preparation of the title compounds V is described. They give, on irradiation, the 2, 3- dihydro-6H-1, 3-oxazine derivatives VI as the main products besides the tetrahydrofuro [3, 4- d] oxazoline derivatives VII. The VI to VII product ratio depends on the substituent bound to the aromatic residue. Polar solvents favour formation of the VI derivatives in the order Cl> H> CH 3. In non-polar solvents the proportion of VII is increased. The quantum yields of the ...
