4- -1 -methyl complex with palladium dichlorid

In a finding of greater practical significance. Overman and coworicers showed that the reactions could be carried out with catalytic amounts of the palladium(II) complex, and that the catalytic effect was broadly applicable to acyclic 1,5-dienes as well7 In a typical example (equation 32), 2-methyl-3-phe-nyl-l,5-hexadiene rearranges in 1 h at room temperature in 87% yield in the presence of 0.06 equiv. of bis(benzonitrile)palladium dichloride, in contrast to the thermal rearrangement which has t n = 13 h at 177 °C. The cat yst thus provides an estimated rate acceleration of about 10 °. The product is a 93 7 mixture of ( )- and (Z)-isomers, corresponding to the equilibrium ratio. Palladium acetate and tetra-kis(triphenylphosphine) were ineffective as catalysts. One serious limitation is that the catalyzed reaction occurs only with those 1,5-dienes which possess an alkyl or aryl substituent at C-2 or C-5 (but not both). 

Cuprous chloride CuCl (mp 430 °C), when complexed with amines such as pyridine or phenanthroline, catalyzes the oxidation of alcohols to aldehydes and ketones by air [347]. In the presence of palladium dichloride, l dCl2, in aqueous dimethylformamide, terminal alkenes are converted by oxygen into methyl ketones [348],... 

Preparation of polymer-supported metal complex. An ethanol solution (20 mL) of palladium dichloride (0.42 mmol) was added to the polymer ligand (chloro-methylated polystyrene-bound porphyrin). The mixture was refluxed and stirred for 15 h. After cooling, the complex was filtered off, washed thoroughly with water and ethanol, and then dried in vacuo. 

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