In 2019,Journal of Organic Chemistry included an article by Zhang, Yu-Fang; Duan, Wen-Di; Chen, Jingjing; Hu, Youhong. Safety of 4-Ethynylpyridine. The article was titled 《Base-Promoted Cascade Reactions of 3-(1-Alkynyl)chromones with Pyridinium Ylides to Chromeno[2,3-d]azepine Derivatives》. The information in the text is summarized as follows:
A base-promoted cascade reaction of 3-(1-alkynyl)chromones with pyridinium ylides has been developed to afford a novel chromeno[2,3-d]azepine scaffold in an efficient and economic manner. This tandem process involves multiple reactions including a Michael addition/deprotonation/alkyne-allene isomerization/cyclization and the subsequent 1,2-addition under mild conditions without a transition metal catalyst. In the part of experimental materials, we found many familiar compounds, such as 4-Ethynylpyridine(cas: 2510-22-7Safety of 4-Ethynylpyridine)
4-Ethynylpyridine(cas: 2510-22-7) belongs to pyridine. Pyridines are often used as catalysts or reagents; particular notice has been paid recently to how pyridine coordinates to metal centers enabling a wide range of valuable reactions. Safety of 4-Ethynylpyridine