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Isolation and characterization of a novel tetrahydro-[2,2 ']bipyrrolyl dimer as an impurity from a Knorr reaction
(2004-09)
A novel dimer, tetraethyl
2,2',3,3'-tetramethyl-1,1',2,2'-tetrahydro-4H,4'H-2,2'-bipyrrolyi-5,5,5',5'-tetracarboxylate, has
been isolated as an impurity (0.4% yield) from a Knorr reaction for the synthesis of ...