Dimethyl palladium dichloride

A mixture of palladium dichloride (17.72 g., 0.10 mole), tri-phenylphosphine (131 g., 0.50 mole), and 1200 ml. of dimethyl sulfoxide is placed in a single-necked, 2-1., round-bottomed flask equipped with a magnetic stirring bar and a dual-outlet adapter (Note 1). A rubber septum and a vacuum-nitrogen... 

Z,5/ )- and (2 ,55)-3,5-Dimethyl-2-phenyl-2,6-heptadiene (5 and 6) Typical Procedure for Palladium Dichloride Catalyzed Rearrangement of 1,5-Dienes994 ... 

Protons of phenyl substituents at C(l) and C(3). Similar radical obtained from (tetra-p-chlorophenyl cyclobutadiene) palladium dichloride. ) The same radical is generated by heating of( bromo-l,2,3,4-tetraphenyl-cis, ciVI,3-butadienyl)dimethyl tin bromide. ) Not observed owing to inclusion in line width. ... 

Di-M-chloro-di-7r( -chloroally)-dipalladium(II) is prepared via the reaction of allene with dibenzonitrile palladium dichloride in benzene (2-10). 1-Methyl- and 1,1-dimethyl-allene also can be used. With benzonitrile as a solvent, only the second product is obtained. 

In other experiments the formation of 1 1 adducts was observed. For instance, when the reaction of 2,3-dimethylbutadiene with methyl aceto-acetate is carried out in the presence of a catalyst composed of palladium dichloride and 3-methyl-1-phenyl-A -phospholene the 1 1 adduct 3-car-bomethoxy-5,6-dimethyl-5-hepten-2-one is formed (Equation 32). Alkali decomposition of this ketone gives 5,6-dimethyl-5-hepten-2-one, a key intermediate for the synthesis of a-irone [39]. 

Dimethylsiletane refluxed 2 hrs. with dimethyl acetylenedicarboxylate in benzene in the presence of bis(triphenylphosphine)palladium dichloride 1,1-di-methyl-2,3-bis(methoxycarbonyl)-l-silacyclohex-2-ene. Y >95%. F. e. s. H. Sa-kurai and T. Imai, Chem. Lett. 1975, 891. 

The mechanisms of formation of Tr-allyl-palladium complexes, both from tetrachloropalladate(n) and allyl alcohol in acidic aqueous solution and from palladium dichloride and alkenes in, for example, dimethyl-formamide, have been discussed. Allylpalladium halide dimers react... 

The palladium-dichloride-catalysed Cope rearrangement of (3i ,5iJ>2,3-dimethyl-3-phenylhepta-l,5-diene occurs at room temperature with virtually... 

HETEROCYCLES Copper phcnylace-tylide. Dichlorobis(benzonitrile)palladium. N-Dichloromethylene-N,N-dimcthylammo-nium chloride. Diiminosuccinonitrile. Dimethyl acetylenedicarboxylate. Dipotassium cyanodithioimidocarbonate. Ethoxy-carbonyl isothiocyanate. Ethyldiisopropyl-amine. Ethylene oxide. Hydrogen fluoride. Isocyanomethane-phosphoric acid diethyl ester. Lead tetraacetate. Lithium aluminium hydride. Methylhydrazine. Phosphoryl chloride. Polyphosphate ester. Polyphosphoric acid. Potassium amide. Potassium hydroxide. Tolythiomethyl isocyanide. Tosylmethyl isocyanide, Trichlo-romethylisocyanide dichloride. Trimethyl-silyldiazomethane. 

Cl2N2PtC22H32, Platinum(II), dichloro[(/ -W,/V -dimethyl-iV,iV -bis( 1-phenylethyl)-1,2-ethanediaminel(ethene)-, 21 87 Cl2N4PdCi2H3o, Palladium , [7V V-bis[2-(di-methylamino)ethyl -A // -dimethyl-1,2-ethanediaminelchloro-, chloride, 21 129 Cl2N6RuC3oH24 6H20, Ruthenium(II), tris(2,2 -bipyridine)-, dichloride, hexahy-drate, 21 127... 

Co-addition and Co-oligomerisation.—Nickel and palladium catalysts are again much in evidence. The same 7r-tetramethylcyclobutadienenickel dichloride plus alkylaluminium halide mixed catalysts which have been investigated in relation to alkene oligomerisation (see above) catalyse coaddition of ethylene and propene. Kinetic results for this reaction are reported. Product analysis and distribution permit postulation of mechanisms of addition of butadiene and but-2-yne to give 4,5-dimethyl-1-... 

Dimethyl-3-hexyne-2,5-diol - Palladium see Dimethylphosphoramidic Dichloride... 

A significant experimental problem in Wacker-type cyclization consists in the nature of the reoxidant Traditional reoxidants such as benzoquinone or copper] 11) dichloride have the disadvantage of difficult separation and sometimes the occurrence of product contamination. A way to overcome this problem lies in the exclusive use of dioxygen as the reoxidant however, the activation barrier for reoxidation of simple palladium salts is usually too high. A significant observation was made by Larock [26] and Hiemstra [27] that dimethyl sulfoxide (DMSO) as solvent markedly enhanced the aerobic reoxidation [28]. 

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