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.
Threading, securing, and releasing a macrocycle on an axle by tying and untying a molecular stopper knot. Reagents and conditions: (i) CF3CO2H (10 equiv), CD2Cl2, RT, 48 h, quantitative; (ii) Lu(SO3CF3)3 (1.1 equiv), MeCN‐d 3, 80 °C, 16 h, 90 % ; (iii) Et3N (10 equiv), CD2Cl2, RT, 1 h, quantitative; (iv) Et4NF (10 equiv), CD2Cl2, RT, 5 min, quantitative.
