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Are there any 'conjugating agents' to accomplish the above transformation? If not, then how to proceed?

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    $\begingroup$ Deprotonation with nBuLi then quenching of the anion at -75 will produce a mixture that is majority the conjugated diene. $\endgroup$ – Waylander Aug 9 '19 at 13:28
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My first instinctive answer would be to use a precious metal catalyst. Palladium usually displays this sort of activity. However, this article should cover most methods from basic and metallic to photochemical. https://www.thieme-connect.de/media/10.1055-b-003-125756/lookinside/10-1055-b-003-125756_chapter012-1.jpg

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