1. For preceding reviews on thiophene 1,1-dioxides, see for example: (a) Rajappa S (1984) In: Bird CW, Cheeseman GWH (eds) Comprehensive heterocyclic chemistry, vol 4. Pergamon, Oxford, chap 3.14
2. Rajappa S, Natekar NV (1997) In: Bird CW (ed) Comprehensive heterocyclic chemistry II, vol 2. Pergamon, Oxford, chap 2.10.3.2
3. Raasch MS (1985) In: Gronowitz S (ed) Thiophene and its derivatives. Wiley, New York, p 571
4. Simpkins NS (1993) Sulphones in organic synthesis. Pergamon, Oxford, p 319
5. For a review on thiophene 1-oxides, see Nakayama J, Sugihara Y (1997) Sulfur Rep 19:349