Lithium chloropalladate

Styryl tellurides are also detellurated on treatment with lithium chloropalladate (2 equiv), giving stereoisomeric mixtures of the homocoupled 1,3-butadienes. 

Another useful feature of the organopalladium reaction is that it can produce fairly hindered olefins from ortho-substituted aromatic mercurials. For example, "2,4,6-triisopropylphenylpalladium chloride , prepared in situ, from the mercurial and lithium chloropalladate in acetonitrile solution, reacts with styrene to produce a 40% yield of fra s-2,4,6-triisopropylstilbene. This is about the same yield of product that is obtained with the unsubstituted "phenylpalladium chloride under the same conditions 24>. 

Carbonylation of a complex obtained from A -phenylbenziinidamide and lithium tetra-chloropalladate(II) (LijPdClJ with carbon monoxide affords 2-phenylquinazolin-4(3//)-one in 97% yield. ... 

Chloro-l,3-dienes are stereoselectively formed via c/.v-halocarborative addition of al-kenes to alkynes in the presence of catalytic amounts of palladium(II) chloride, lithium chloride and oxygen46. The reaction proceeds via cis chloropalladation of the alkyne and c/.v-orientated alkene insertion, followed by /(-hydrogen elimination. Alternatively, 1.4-dienes are obtained if, for steric reasons, a. nn-periplanar /(-hydrogen atom is not available to form the conjugated diene (e.g., after m-orientated insertion of cyclohexene)46. 

Another series of -alkyl-metal complexes that owe their stabilities to the formation of a five-membered chelate ring is those produced in the reaction of allylic and, homoallylic amine and sulfide complexes of Pd(II) with nucleophiles. Lithium tetra-chloropalladate reacts with N,N-dimethylallylamine in methanol to produce the methoxy- kalkylPd complex ... 

More simple, but so far of less general use, is the formation of isocoumarins by cyclization of o-alkenyl-benzoic acids [(159)->(160)], using lithium tetra-chloropalladate in aqueous dioxan at room temperature/" "... 

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