Reactivity of Ketenes in Matrices. Direct Observation of Ketene−Pyridine Ylides
1996; American Chemical Society; Volume: 118; Issue: 24 Linguagem: Inglês
10.1021/ja9607190
ISSN1943-2984
AutoresGreg G. Qiao, John Andraos, Curt Wentrup,
Tópico(s)Synthesis and Reactivity of Heterocycles
ResumoKetenes 7, 14, and 17 have been generated in pyridine matrices and observed by infrared spectroscopy to react with pyridine at temperatures between 15 and 50 K to form ketene−pyridine ylides 12, 15, and 18. Azaheterocyclic ketenes 20, 23, and 26 dimerize or tetramerize at ca. 50 K, whereby one ketene molecule acts as a nucleophile toward the other, forming a transient ketene−imine ylide.
Referência(s)