| 摘要 |
<p>A method of preparing compounds of the formula:
<Chemistry id="chema01" num="0001"><Image id="ia01" he="17" wi="40" file="IMGA0001.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry>wherein a novel palladium catalyst system is utilized comprising
<UnorderedLists id="ula01" listStyle="none"><ListItem>palladium together with C<Sub>1-2</Sub>COO<Sup>-</Sup> ligands and halo ligands wherein the molar weight percent based on total ligand molar weight, of the C<Sub>1-2</Sub>COO<Sup>-</Sup> ligand is from 30 to 60%; and</ListItem><ListItem>wherein the ratio of the total molar weight of the ligands to the molar weight of palladium utilized is from 4:1 to 10:1; and</ListItem><ListItem>a catalyst regeneration portion comprising from 0.1 to 8.0 parts of phosphomolybdenovanadic acid per part of palladium catalyst, and at least 20 parts of a solubilizing agent selected from ethylene carbonate, propylene carbonate, and sulfolane, per part of palladium catalyst.</ListItem></UnorderedLists></p> |
