Palladium tetrakis triphenylphosphin

Tetrakis(triphenylphosphine)palladium(0) Palladium, tetrakis(triphenylphosphine)-(8) Palladium, tetrakis(triphenylphosphine)-, (T-4)- (9) (14221-01-3) Triphenylphosphine Phosphine, thphenyl- (8,9) (603-35-0)... 

Palladium tetrakis(triphenylphosphine) see tetrakis(triphenylphosphine) palladium. 

More recently, substituted allenyl sulfones were also engaged in Pd/Ag-catalyzed Heck-type reactions. Treated with palladium tetrakis(triphenylphosphine) and a mixture of silver and potassium carbonate in DMF at 80°C, such allenyl sulfones... 

Further investigations including 109Ag NMR confirmed the in situ formation of alkynyl silver through jt complexation and proton abstraction.117 They also revealed that the best palladium catalyst, namely, palladium tetrakis(triphenylphosphine), played a key role, in that a phosphine liberated by decoordination ended up on the alkynyl silver, stabilizing it and rendering it more soluble.118 The resulting alkynyl silver then entered the palladium catalytic cycle at the transmetallation step (See section 10.6.2).105... 

Terminal acetylenes dimerize to conjugated enynes in the presence of catalytic amounts of palladium(II) acetate and the hindered phosphine tris(2,6-dimethoxyphenyl)phosphine. 1-Octyne, for instance, affords the enyne 36 5. Palladium-catalysed condensations of 1-alkynes RC=CH (R=Ph or CH2OH) with vinyl bromide, ( )-2-bromostyrene, iodobenzene and 2-bromopyridine to yield 37, 38, 39, and 40, respectively (Scheme 1), have been reported (see also References 27 and 28). The palladium[tetrakis(triphenylphosphine)]-catalysed alkynylation of 1,1-dichloroethene with terminal alkynes 41 (R = pentyl, 3-chloropropyl, Ph or SiMes) results in the eneynes 42. ... 

Esters 106 (R = Me, Et or Pr = Et, Pr, r-Bu or PhCHi) of aliphatic carboxylic acids react with lithium acetylides 107 (R = H, C5 Hi i or Ph) in the presence of boron trifluoride etherate in THE to give acetylenic ketones 108 (equation 18). Palladium-[tetrakis(triphenylphosphine)]-copper(I) iodide catalyses the oxidative addition-decarboxylation of propargyl methyl carbonates, e.g. 109, with terminal alkynes to yield 1,2-dien-4-ynes (allenylacetylenes) 110. The regiochemistry of the palladium-catalyzed addition of phenylacetylene to the allenic ester 111 depends on the nature of the catalyst used palladium(III) acetate-triphenylphosphine yields a 81 19 mixture of adducts 112 and 113, while in the presence of tetrakis(carbomethoxy)palladacyclopentadiene-tris(2,4,6-trimethoxyphenyl)phosphine the ratio is reversed to 9 91 k... 

Attention now turned to the installation of the carbonyl moiety. First, carbon-ylation of iodide 45 with bis(triphenylphosphine)palladium(II) dichloride and hydrazine at 60 °C was investigated (Entry 1, Table 4). After 30 min, the starting material had been fully consumed, furnishing a low yield of an unidentifiable product, and potentially formed via reaction of hydrazine with the carbonyl moiety. In contrast, application of high temperature carboalkoxylation conditions was successful (Entry 2). Carboalkoxylation with carbon monoxide catalyzed by palladium tetrakis(triphenylphosphine) with... 

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