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2. Reactions 21 C. F u l v e n e s  24 1. Theoretical Rationales of Periselectivity  24 2. Synthesis of Arainofulvenes 28 3. Reactions of A m i n o f u l v e n e s  29 II. Results and Discussion 32 A. Preparation of Thiophene Dioxides  33 1. The Diene-Sulfur Dioxide Reaction  33 2. Bromination of S u l f o n e s  36 3. Dehydrobromination of 3,4-Dibromotetrahydrothiophene Dioxides  38 B. Preparation of Aminofulvenes 41 C. Reactions of Thiophene Dioxides and Aminofulvenes . . . 45 1. Symmetrical Thiophene Dioxides  45 2. 3-Substituted Thiophene Dioxides  62 3. 2-Substituted Thiophene Dioxides  73

Synthesis of azulenes by the [6 + 4] cycloadditions of 6-aminofulvenes to thiophene S,S-dioxides