prov:value
| - When in Step (4) above other dehydrating agents, such as phosphorus oxychloride, aluminum oxide, sulfuric acid, and ptoluene sulfonic acid, are substituted on an equivalent basis for the thionyl chloride used above, and when in Step (4) above other anhydrous solvents, e.g., halogenated hydrocarbon solvents such as carbon tetrachloride, chloroform, and 1,2-dichloroethane; aromatic hydrocarbon solve
|