帕爾-克諾爾合成（德語：Paal-Knorr-Synthese）是由1,4-二羰基化合物作原料環化製取呋喃、噻吩或吡咯類化合物的方法。得名於化學家卡爾·帕爾（Carl Paal）和路德維希·克諾爾（Ludwig Knorr）。[1][2][3]
原料在無水酸性條件下失水生成呋喃環系：[4]
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