P 2801 (OTTO) 1,10-Phenanthroline, 99% Cas 66-71-7 - used as a chelating agent, used as bidendate nitrogen ligands in Heck type reactions as an alternative to phospine ligands. P 2801 (OTTO) 1,10-Phenanthroline, 99% Cas 66-71-7 - used as an indicator for alkyllithium reagents and an inhibitor of metallopeptidase enzymes.