Scheme 9. Macrocyclization via [2 + 2] Cycloaddition of Alkynes with Alkenes.
Reaction performed with catalyst 25b.
Reaction performed with catalyst 25c.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.