Removed the following paragraph:

Thiophene can be produced at little cost via reaction of sulfur and butane. CHCH2CH2CH3 + S -> C4H4S + 3 H2S.

This doesn't seem to be an important industrial process, please provide links or references. The conversion needs temperatures of 600 °C. Moreover, the formula is wrong. Cacycle 17:27, 18 Feb 2005 (UTC)