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Acyclic 1,7‐ and 1,8‐enynes with the alkyne moiety directly connected to the asymmetric carbon of an ethyl acetal have been obtained in two steps from the corresponding aldehydes. Ring‐closing metathesis of these enynes delivered the corresponding six‐ and seven‐membered cyclic 1,3‐dienes in moderate‐to‐excellent yields. A competitive ethylene insertion into the alkyne moiety leading to trienes was...
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