prov:value
| - Advantageous solvents are cyclic ethers, e.g. dioxane and tetrahydrofuran, dialkyl ethers, e.g. diethyl ether, aliphatic halohydrocarbons, e.g. methylene chloride, chloroform and carbon tetrachloride, carboxylic acid esters, e.g. ethyl acetate, benzene, alkylbenzenes and halobenzenes, e.g. toluene, xylene and chlorobenzene, dimethylformamide, dimethylsulfoxide, hexamethylphosphotriamide and mixtur
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