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.
Possibilities to alter the macrocycle's conformation: 1) introduction of sterically demanding substituents; 2) metallation; 3) axial ligands; 4) degree of reduction; 5) interruption of the conjugated system (see Section 2); 6) N‐alkylation, ‐arylation, or protonation; 7) cation radical formation; 8) “strapping” of the macrocycle via covalent linkage of the meso‐ or β‐pyrrole positions; 9) heteroatom substitution. Core and skeleton transformations are possible, too.
