Alkenes from Mizoroki-Heck coupling

Another attractive three-component procedure involves the versatile triazene linker T1 and generates spirooctene 30 from a Mizoroki-Heck reaction of immobilized iodoarene 29 with bicyclopropylidene in the presence of an acrylate derivative (Scheme 14.9) [27, 28], The triazene moiety can be cleaved to diazonium salts which, in turn, act as substrates for Mizoroki-Heck reactions with various alkenes to give spirooctenes 31. The latter can be obtained without the double bond in the coupled alkene if palladium on charcoal is used instead of palladium acetate, hi this case, the same catalyst promotes the Mizoroki-Heck reaction and the subsequent hydrogenation [28]. 

Heck coupling Catalytic formation of a substituted alkene starting from an unsaturated halide and an alkene (also called Mizoroki-Heck reaction)... 

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