Main group organometallic compounds cross-coupling

Cross-Coupling with Main Group Organometallic Compounds... 

Allylic compounds undergo smooth Pd-catalyzed cross-coupling with main group organometallic compounds as expected. Substitution occurs mainly at less-substituted allylic termini. A few examples are cited here. 

Oxidative addition of aryl (or vinyl) halide to Pd(0) precursor forms the monoarylpalladium complex that is the common intermediate in the catalytic cross-coupling reactions of haloarene with organometallic compounds of main group elements such as Mg, Si, and Sn. Alkynylcopper, formed from alkyne, Cu(I) salt and base in the reaction mixture, transfers the ligand to the above Pd complex, giving an intermediate complex with aryl (or vinyl) and alkynyl ligands bonded to Pd. Reductive elimination of arylacetylene (or enyne) occurs... 

Cross-coupling proceeds by transmetallalion of 1 with organometallic compounds of main group metals (Mg, Zn, B, Al, Sn, Si) and reductive elimination to give 12 as summarized in Scheme 3.3. 

Cross-Coupling Reactions with Organometallic Compounds of the Main Group Metals via Transmetallation... 

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