In 2017,Luo, Kui; Cao, Tongxiang; Jiang, Huanfeng; Chen, Lianfen; Zhu, Shifa published 《Gold-Catalyzed Ring Expansion of Enyne-Lactone: Generation and Transformation of 2-Oxoninonium》.Organic Letters published the findings.Name: 2-Bromonicotinaldehyde The information in the text is summarized as follows:
An efficient gold-catalyzed ring-expansion reaction of enyne-lactones to form 2-oxoninonium intermediates is reported. The 2-oxoninonium generated in this work could undergo further 6π electrocyclization and aromatization reaction to produce different aromatic compounds In the part of experimental materials, we found many familiar compounds, such as 2-Bromonicotinaldehyde(cas: 128071-75-0Name: 2-Bromonicotinaldehyde)
2-Bromonicotinaldehyde(cas: 128071-75-0) belongs to pyridine. Pyridine is very deactivated towards electrophilic substitution with respect to benzene. For this reason classical formylation, using methods such as the Gattermann or Vilsmeier reactions, are not generally successful. Name: 2-Bromonicotinaldehyde