1. P. Manitto, Experientia27, 1147 (1971).
2. A. Hassner, J. org. Chem.33, 2684 (1968).
3. Irradiations were conducted as described in ref.1; thin-layer chromatography was carried out on polyamide [methanol −10% ammonia 9∶1 (v/v)], spraying the plates with diazotised sulphanilic acid in HCl dil.
4. All the new compounds blackened without melting over 250°; they gave correct elemental analyses consistent with the assigned structures.
5. Chemical shifts are in parts per million (δ) from internal tetramethylsilane;s, singlet;d, doublet;t, triplet;q, quartet;m, multiplet.