Bohle, M., Liebscher, J., Ring Contraction

Bohle, M., Liebscher, J., Ring Contraction of Heterocycles by Sulfur Extrusion,... 

In Chapter 2, M. Bohle and J. Liebscher (Humboldt University, Berlin) review ring contractions of heterocycles by sulfur extrusion, which includes the elimination of various sulfur species all leading to a ring contraction containing one less member. This is the first comprehensive review of a subject that is of preparative as well as theoretical importance. 

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