Sodium tetrachloropalladate

Similar intermediates can be isolated in which chelating olefinic groups replace the tertiary amine. Dicyclopentadiene, for example, reacts with methanol and sodium tetrachloropalladate as shown in the following equation 9-10>. 

Sodium arenetellurolates reacted with sodium tetrachloropalladate(II)3 and with 1,5-cyclooctadienedichloropalladium in ethanol at room temperature4. 

Tellurophene and sodium tetrachloropalladate(Il) produced a mononuclear and dinuclear complex4. 

This compound has been prepared by the reaction of sodium tetrachloropalladate and the olefin4 or by the displacement of carbon monoxide from [COPdCl2]25 or benzonitrile from (C6H5C=N)2PdCl2. Bicyclo[2.2.1]hepta-2,5-diene (2,5-norbor-nadiene) may be substituted in the following procedure for 1,5-cyclooctadiene to yield (bicyclo[2.2.1]hepta-2,5-diene)di-chloropalladium(II). 

The trialkyl phosphine complexes are usually prepared by reaction of the phosphine with sodium tetrachloropalladate(II) in alcohol, with hydrated palladium(II) chloride in ethanol, or with a suspension of anhydrous palladium(II) chloride in benzene. However, these methods cannot be e.xtended to include ligands, or their derived complexes, which undergo solvolysis or which do not react with anhydrous palladium(II) chloride suspensions. Although trialkyl phosphite complexes have been... 

The commercial catalyst used for hydrogenation was a palladium on charcoal catalyst (type 37), manufactured by Johnson Matthey (UK)) with metal content 4.89% and supplied as powder. The Pd metal was d osited on the exterior sur ce of the charcoal The Pd/Ii02 catalyst was prepared using sodium tetrachloropalladate (II), supplied by Johnson Matthey (UK) and titanium dioxide, firom Degussa (Germany). The hydrogen gas was supplied by BOC (UK), with >99.98% purity and was used directly fi om cylinder. The reactant, butyne-l,4-diol 99%, was procured firom Aldrich (UK) and water and 2-propanol obtained firom Fisons (UK), were used as solvents. Additives such as lead acetate, quinoline, thiophene and triethyl phosphite were supplied by Aldrich (UK) and cupric acetate, zinc su hate, ferric nitrate and potasaum hydroxide were provided by Fisons (UK). 

A new development is biphasic hydrogenation using solvent-stabilized colloid (SSCs) catalysts [39-41]. Palladium colloid systems, especially, were proven to give high reactivity and selectivity. Best solvents are dimethylformamide and particularly the two cyclic carbonic acid esters, ethylene carbonate and 1,2-propene carbonate. In these solvents sodium tetrachloropalladate - stabilized by a sodium carbonate buffer - is reduced with hydrogen to yield the solvent-stabilized palladium colloid. Transmission electron microscopy of the palladium colloid demonstrates that the colloid particles are spherical with an average diameter of 4 nm. 

Palladium salts, such as palladium dichloride and sodium tetrachloropalladate, also exhibit catalytic activity. Phosphane complexes, however, are completely inactive for this type of rearrangement. The stereochemical outcome of the bis(benzonitrile)dichloropa ladium(Il) catalyzed rearrangement of substrate 1 has been explained by a boatlike transition state where the diene moiety may act as a bidentate ligand344. The internal asymmetric induction is opposite to that in the 2,6-dimethylphenol catalyzed rearrangement (vide supra). 

Sodium tetrachloropalladate(ll) trihydrate Na3PdCl4-3H30 13820-63-6 348.26 brn-red hyg cry vs H,0 s FtOH... 

Tetrachloropalladate(II) ion catalyzes the interconversion of 1- and 2-butenes in aqueous solutions containing chloride and hydronium ions. Sodium tetrachloropalladate(II) catalyzes the conversion of allylbenzene to propenyl-benzene in acetic acid solutions. Tetrakis(ethylene))Lt,/x -dichlororhodium(l) catalyzes butene isomerization in methanolic hydrogen chloride solutions . Cyclooctadienes isomerize in benzene-methanol solutions of dichlorobis-(triphenylphosphine)platinum(11) and stannous chloride. Chloroplatinic acid-stannous chloride catalyzes the isomerization of pentenes. Coordination complexes of zero-valent nickel with tris(2-biphenylyl)phosphite or triphenyl-phosphine catalyze the isomerization of cis-1,2-divinylcyclobutane to a mixture of c/5,m-l, 5-cyclooctadiene and 4-vinylcyclohexene . Detailed discussions of reaction kinetics and mechanisms appear in the papers cited. 

Sodium tetrachloropalladate(II) 2-Aryl-3-indazolones from azo compounds via carbonylation... 

Troitzkaya et al. reported the formation of the complexes [Pd (EtO)2PO 2l and [PdCl (EtO)2PO] (EtO)2POH l2 from the reaction between K2[Pda4] and diethyl H-phos-phonate (or triethyl phosphite) in water [429]. Treatment of sodium tetrachloropalladate... 

Many allyl palladium complexes may be prepared in an analogous manner. The starting materials for this reaction are allyl halides and sodium tetrachloropalladate(II) in the presence of CO. Instead of carbon monoxide, SnCl2 may be used as a reducing agent. 

The reaction of ( -(A,A-dimethylaminomethyl)cyclopentadien-yl)( " -tetraphenyl-cyclobutadiene)cobalt with sodium tetrachloropalladate and (7 )-Af-acetylphenylalanine... 

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