“…Since compound 10 could not be isolated in pure form, we tried to obtain it in another way, starting from the adduct of formamide and phenylglyoxal. However, unlike 4-chlorophenyl-and 4-methylphenylglyoxals, for which adducts with formamide have been successfully synthesized [17,19], the reaction of phenylglyoxal with formamide was accompanied by significant resin formation, regardless of conditions (when heated or at room temperature, in benzene or THF).…”