Thermal and Photochemical Reactions Involving No Other Species

2 Thermal and Photochemical Reactions Involving No Other Species [Pg.298]

Pyrrole, furan and thiophene rings are thermally very stable. [Pg.298]

Photochemical scrambling of ring atoms can involve a ring-walk or a cyclopropene mechanism. [Pg.298]

2-Cyanopyrrole undergoes photochemical rearrangement to 3-cyanopyrrole. Analogous rearrangement of yV-methyl-2-cyanopyrrole (18) in methanol gives in addition to the 3-cyanopyrrole (20) the bicyclic intermediate (19) trapped as the methanol adduct (21) (78CC131). [Pg.298]

The parent Dewar thiophene (24) has been generated and trapped (85JA723). When a solution of thiophene in furan (mole ratio, 1 10) was irradiated at 229 nm at 25°C, the two 1 1 adducts (25) and (26) were formed. [Pg.299]

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