Allenes have been shown to be versatile building blocks in organic synthesis. However, the diversity of the allene chemistry
offers a challenging and exquisite task for organic chemists bent on building the suitable allene substrates. A good solution might be
propargyl-allenyl isomerization, which means to prepare readily available propargyl substrates. This review focuses on recent progress in
the in situ propargyl-allenyl isomerization in organic synthesis, published in 1990 and later.
Keywords: Propargyl-allenyl isomerization, Allene, Cyclization, Base-promotion, Propargyl Ether, coupling–isomerization–Claisen, sulfur (selenium), bis-propargylic sulfides, cycloaddition, nitrogen
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