AEROBIC OXIDATION OF CIS-2-BUTENE AND 2-BUTYNE IN WATER MEDIATED BY (DPMS)PtII (DPMS = DI(2-PYRIDYL) METHANE SULFONATE)

Abstract

(dpms)PtII hydroxo ethylene complex (2.1) undergoes ligand substitution--intramolecular hydroxo platination with 2-butyne in water to give PtII η1-ketonyl complex (2.2). This neutral complex is oxidized by O2 or H2O2 to give PtIV secondary alkyl complex (2.4). Oxidation by O2 was found to be pH dependent. Also described here is the preparation of PtIV oxetane (3.2) derived from non-cyclic non-strained olefin, cis-2-butene. The starting complex here is the (dpms)PtII chloro cis-2-butene (3.1) which undergoes chloride abstraction by Ag2O to give the hydroxo analog before getting oxidized by O2<1sub> to PtIV oxetane.