G. Harie et al., PHOTOCHROMIC BEHAVIOR OF BIS[4-(N,N-DIMETHYLAMINO)PHENYL]-SUBSTITUTED3H-NAPHTHO[2,1-B]PYRAN AND 2H-1-BENZOPYRAN, Tetrahedron letters, 38(17), 1997, pp. 3075-3078
The photochromic behaviour of -(N,N-dimethylamino)phenyl]-3H-naphtho[2
,1-b]pyran (2) and 2-bis[4-(N,N-dimethylamino)phenyl]-2H-1-benzopyran
(3) has been studied by flash photolysis and compared to 3,3-diphenyl-
3H-naphtho[2,1-b]pyran (1) in order to delineate effects due to the N,
N-dimethylamino groups. (C) 1997 Elsevier Science Ltd.