The main modes of heterocyclic-ring synthesis in 2011 were cycloadditions, cyclizations, multi-component reactions, and ring-expansions with copper(I), gold(I), iron, palladium and rhodium being the most widely used transition metal catalysts. Some syntheses achieve good regioselectivity (e.g. organocatalysis) without transition metals.
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Annual Reports Section "B" (Organic Chemistry)
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