In this and the oxa-related cycloadditions (above), a diaza-alicycle related to 110 is considered to be an intermediate that decomposes to a 1,3-dipolar species 111—the active intermediate for the second coupling step; other evidence rules out epoxide 112 (X=O) as an intermediate.

[…] the mistaken idea that wagtails and hedge-warblers feed the young cuckoos they bring up, long after they leave the nest, whenever they hear their cuckooing, […]

Founded in 1953 to seed a new conservative generation (and originally called the Intercollegiate Society of Individualists), this pioneer of what would become a sprawling conservative counterestablishment boasted as its first president a young man named William F. Buckley Jr., who would go on to bigger things.

I was daunted by the prospect of interviewing such a heavyweight politician.