Paal-Knorr / Knorr (1884)

Layer 2 — Chemistryin the heterocyclic-chemistry subtree

Paal-Knorr 1884 + Knorr 1884 classical heterocyclic syntheses: 1,4-diketone -> furan/pyrrole/thiophene with NH3/H2S; alpha-aminoketone -> pyrrole.

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