Scheme 1.
[4+4]‐condensation reactions of trimethylamines 1 and trialdehydes 2. R and R′ substituents were omitted for clarity in the cage structures.
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.