M. Luning U",mu,"muller et al., NEW CONCAVE 1,10-PHENANTHROLINES - CATALYSTS FOR THE ALCOHOL ADDITIONTO KETENES AND LIGANDS IN TRANSITION-METAL COMPLEXES, Chemische Berichte, 127(11), 1994, pp. 2297-2306
By bridging tetrahydroxy-1,10-phenanthrolines 9 by ditosylates 10 or d
iiodides 11 concave 1,10-phenanthrolines 1 were synthesized. Their con
cave shape was proven by X-ray analyses of 1a and 1c, their basicities
were determined by photometric titrations. Compounds 1a-g are active
in the base-catalyzed addition of alcohols to ketenes and form stable
metal ion complexes with transition metal salts.