Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... Co(salpr) catalyzes the conversion of 2′-hydroxychalcones to flavanones in methanol under oxygen. Base catalysis by Co(salpr) (OH) produced in situ is responsible for the reaction, which is found to proceed reversibly. ... Reversible interconversion between 2′- ...