Dimethyl 2-(4-bromophenyl)-10,11-dimethoxy-2,3,7,8-tetrahydrospiro[azepino[2,1-a]isoquinoline-3,9'-fluorene]-4,5-dicarboxylate.
The title compound, C38H32BrNO6, is a new photochromic tetrahydroazepinoisoquinoline (THAI). The longest spiro bond [1.589 (4) A] can be broken very easily by UV light, leading to ring opening. This explains the photochromic behaviour.
Feng
Li
L
Department of Chemistry, Fudan University, Shanghai 200433, People's Republic of China.
Li
Zhi-Ming
ZM
Chen
Zhen-Xia
ZX
Tan
Yong-Sheng
YS
Weng
Lin-Hong
LH
Tao
Feng-Gang
FG