3-carbonyl-3H-indole: Direct observation and tetramerization to a tetrabenzoporphyrin analogue
摘要:
Heterocyclic ketenes with alpha-nitrogen atoms such as P-carbonyl-PH-indole (6) dimerize to a pyrazinedione type molecule (7). However, the beta-nitrogen analogue, viz. 3-carbonyl-3H-indole (5) oligomerizes to tetramer 4. The direct observation of ketene 5 and the characterization of tetramer 4 are described.