title: A new photochromic tetrahydroindolizine.
abstract: The title compound, dimethyl 10b'-(4-fluorostyryl)-8',9'-dimethoxy-4-nitro-5',6'-dihydrospiro[9H-fluorene-9,1'(10b'H)-pyrrolo[2,1-a]isoquinoline]-2',3'-dicarboxylate, C38H31FN2O8, is a new photochromic tetrahydroindolizine. One of the C-C bonds at the spiro C atom is very long [1.630 (2) A], thus explaining the photochromic behaviour.
authors.affiliation: Department of Chemistry, Fudan University, Shanghai 200433, People's Republic of China.
authors.forename: Li
authors.initials: L
authors.lastname: Feng
authors.forename: Zhi-Ming
authors.initials: ZM
authors.lastname: Li
authors.forename: Yong-Sheng
authors.initials: YS
authors.lastname: Tan
authors.forename: Min-Qin
authors.initials: MQ
authors.lastname: Chen
authors.forename: Lin-Hong
authors.initials: LH
authors.lastname: Weng
authors.forename: Feng-Gang
authors.initials: FG
authors.lastname: Tao