Strain versus flexibility: The palladium‐catalyzed reaction of haloalkynes with norbornene derivatives leads to 7‐alkynyl norbornane products (see scheme). Key to the success of this reaction is the formation of a “bridging” palladium species, which can rearrange to result in a C‐7 functionalization. The ring‐structure‐dependent [2+2] cycloaddition of haloalkynes with cyclooctene has been achieved in moderate to good yields under similar conditions.

No abstract

No abstract

A palladium-catalyzed 1:2 linear/cyclic cross-trimerization of alkyne with alkenes using molecular oxygen as the sole oxidant has been reported for the first time. A series of 1,3,5-trienes and 1,2,4,5-tetrasubstituted benzenes are obtained with high chemoselectivity respectively and mechanisms of these reactions are proposed based on some controlled examination.

No abstract