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118CSpr21L22p1 duration 26 minutes 13 seconds 118CSpr21L22p1 118CSpr21L22p1	118CSpr21L22p1 Heterocyclopentadienes nitrogen ring c2 bit pair heterocycle dot resonance thiophene substitution lot things electrophile position side minus hydrogen parole catalyst sulfur From Sarah Lievens 0 likes 333 plays 0
118AWin21L22p2 duration 14 minutes 18 seconds 118AWin21L22p2 118AWin21L22p2	118AWin21L22p2 Paal-Knorr Synthesis of Heterocyclopentadienes carbonyl beta carbon ketone tautomerization groups bit synthesis addition ester alpha branch alcohol carbons alkyl water steps acyl acid parole From Sarah Lievens 0 likes 321 plays 0