Platinum(II)-Catalyzed 1,6-Diene Cycloisomerizations: Turnover in the Absence of β-Hydride Elimination
摘要:
Electrophilic pincer-ligated Pt(II)-clications are efficient catalysts for the cycloisomerization of 1,6-dienes, initiated by alkene activation. The tridentate ligands inhibit beta-hydride elimination and thus enable cationic mechanisms that turnover by Pt(II) extrusion. PPP ligands lead to cyclopropane products, while PNP ligands provide cyclohexene products; mechanistic issues are also discussed.
Platinum(II)-Catalyzed 1,6-Diene Cycloisomerizations: Turnover in the Absence of β-Hydride Elimination
摘要:
Electrophilic pincer-ligated Pt(II)-clications are efficient catalysts for the cycloisomerization of 1,6-dienes, initiated by alkene activation. The tridentate ligands inhibit beta-hydride elimination and thus enable cationic mechanisms that turnover by Pt(II) extrusion. PPP ligands lead to cyclopropane products, while PNP ligands provide cyclohexene products; mechanistic issues are also discussed.