8] Further, no fluorescence is at first observed on 253.7-nm irradiation of ( l a ) and ( I b ) or ( 3 a ) and ( 3 b ) although indistinctly fluorescing by-products are formed on prolonged irradiation.[9] All the new compounds were characterized by elemental analysis and spectroscopic techniques.
[lo] H! Tochtermann, K . Oppi,nliinder, and M . Nguyen-Duong Hoang,Liebigs Ann. Chem. 701, 117 (1967); H . Prinzbach, P. Wiirsch, P. Vogel, W Tochtermann, and C . Franke, Helv. Chim. Acta 51, 911 (1968); cf. footnote 10 in [Zb]. We thank Dr. W Tochtermann for a gift of (1 b ) and
The synthesis and determination of thermo-The spiro-norcaradienes (111) were obtained as previously dynamic parameters are described for spiro-norcara-by photolysis of the corresponding diazo-cyclopentadienes dienes (111) substituted in the norcaradiene 6-membered (V) in trifluoromethylbenzene (VIa) or m-hexafluorodiring.
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