Platinum(II)-catalyzed 1,6-diene cycloisomerizations: turnover in the absence of beta-hydride elimination.
Electrophilic pincer-ligated Pt(II)-dications 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.
Kerber
William D
WD
Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, USA.
Koh
Jeong Hwan
JH
Gagné
Michel R
MR
D002384:Catalysis; D003500:Cyclization; D003516:Cycloparaffins / Q000138:chemical synthesis* / Q000737:chemistry*; D008024:Ligands; D015394:Molecular Structure; D010984:Platinum / Q000737:chemistry*; D013237:Stereoisomerism
D003516:Cycloparaffins; D008024:Ligands; D010984:Platinum