Journal
ORGANIC LETTERS
Volume 9, Issue 9, Pages 1699-1701Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol070574+
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The cross metathesis reactivities of alpha-methylene-gamma-butyrolactone and an alpha-methylene-delta-lactone have been investigated. alpha-Methylene-gamma-butyrolactone undergoes rapid and efficient olefin isomerization in the presence of second-generation metathesis catalysts. However, cross metathesis can be achieved with the additive 2,6-dichlorobenzoquinone. In contrast, the alpha-methylene-delta-lactone neither isomerizes nor couples under similar conditions.
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