| prov:value
| - zodicarboxylate (e.g., diethylazodicarboxylate, diisopropylazodicarboxylate, etc.), trialkyl (e.g., C.sub.1 -C.sub.20) phosphine ortriarylphosphine (e.g., triphenylphosphine, trioctylphosphine, tributylphosphine, etc.) and the like.Examples of the solvent used include hydrocarbons such as benzene, xylene, toluene, etc., ethers such as diethyl ether, diisopropyl ether, tetrahydrofluran, dioxane, et
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