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.
(A,a) Applied calix[4]arene ligand in coupling reactions and (b) proposed [M(0)(ArX)L] intermediate formed prior to the oxidative addition step. (B) Asymmetric aldol reaction catalyzed by an L-proline-calixarene-derived achiral thiourea host-guest complex (19).
