Abstract
Single and bulky substituted o-phosphinophenoles, -naphtholes, -diphenyl-2′-oles and -dinaphthyl-2′-oles are prepared and their preferred conformations studied. Substitution reactions at OH- and PH-groups, cyclization reactions to give P-E-O and P=E-O heterocycles as well as formation of nickel chelate complexes are described.