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. ... 2,2′,6,6′-tetraaryl 4,4′-bipyrannylidenes with eight flexible chains are synthesized by electrochemical reduction of the corresponding 2,6-diarylpyrylium salts. ... 2,2′,6,6′-tetraaryl 4,4′-bipyrannylidene 1 can be synthesized by chemical reduction of 2,6 pyrylium salts 2 with zinc powder.
