Ring-closing metathesis (RCM) is not restricted to alkenes; similar reactions are also known for alkynes. The tungsten alkylidyne complex has been used to catalyze such reactions. Predict the structures of the cyclic products for metathesis of
(See A Farstner and C. Seidel, Angew. Client., Int. Ed., 1998, 37, 1734.)
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