4-membered


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Adj.1.4-membered - of a chemical compound having a ring with four members4-membered - of a chemical compound having a ring with four members
membered - having members; normally used in chemistry in combination with a number
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The reversible formation of a 4-membered ring ruthenacycle is the key step, which is followed by a retro cycloaddition in the opposite sense to give the newly formed olefin.
Metal-catalyzed reactions of heterocycles (3- and 4-membered rings) with heterocumulenes is a novel approach developed by Alper and coworkers for the preparation of interesting cycloaddition products.