Diketones tetrakis palladium

Diketones Tetrakis(triphenylphos-phine)palladium. Tin(ll) trifluoromethane-sulfonate. Titanium(IV) chloride. [Pg.665]

Diketones Tetrakis(triphenylphos-phine)palladium. Triphenylphosphine. [Pg.585]

Another route to /3-diketones is to heat a,/3-epoxyketones in the presence of tetrakis(triphenyl-phosphine)palladium(0) as catalyst and bis(diphenylphosphino)ethane (dppe) (Equation (7)) 53... [Pg.101]

The palladium-catalyzed system can be extended to the acylation of siloxycyclopropanes with aroyl chloride/carbon monoxide or aryl triflate/carbon monoxide, which gives 1,4-diketones. Contrary to the case of doubly oxygen-substituted cyclopropanes vide infra), the acylation of 1-siloxycyclopropanes is restricted to aroyl chlorides and is not applicable to aliphatic or a, -unsaturated acyl chlorides. For the reactions with aryl triflates, tetrakis(triphenylphos-phane)palladium(O) is used as catalyst, while the reactions with aroyl chlorides employ bis(triphenylphosphane)palladium(II) chloride and ( / -allyl)chloropalladium dimer/triphenyl phosphite as catalysts. In these reactions, aroylpalladium(II) species may undergo ring opening of the siloxycyclopropanes. [Pg.2022]

Tetrakis( triphenylphosphine) palladium (0 )ll,2-bis( diphenylphosphino ) ethane p-Diketones from a,p-oxidoketones p,6-Diketophosphonic acid esters... [Pg.329]

A variety of a-nitroepoxides undergo conversion to the corresponding 1,2-diketones or, in some cases, a-nitroketones with tetrakis(triphenylphosphine)palladium(0) (Scheme [io],[ii] Proposed reaction mechanism is shown in Scheme 16. 2,3-Epoxy alcohols also undergo the Pd(0)-catalyzed reaction to be isomerized to a- or /3-hydroxy ketones or both, depending on the nature of the substituents on the phenyl ring (Scheme... [Pg.1272]

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