Tetrahedron letters

3-carbonyl-3H-indole: Direct observation and tetramerization to a tetrabenzoporphyrin analogue

GGH Qiao, C Wentrup

Index: Wentrup, Curt Tetrahedron Letters, 1995 , vol. 36, # 22 p. 3913 - 3916

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Citation Number: 6

Abstract

Heterocyclic ketenes with α-nitrogen atoms such as 2-carbonyl-2H-indole (6) dimerize to a pyrazinedione type molecule (7). However, the β-nitrogen analogue, viz. 3-carbonyl-3H- indole (5) oligomerizes to tetramer 4. The direct observation of ketene 5 and the ...

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