| http://www.w3.org/ns/prov#value | - We have found the clays to be particularly useful catalysts in certain specific organic reactions, such as the production of esters by the reaction of an olefin or an olefin oxide with a carboxylic acid, the production of ethers by reaction of an alcohol and an olefin or an olefin oxide, the production of an ether by the reaction of a primary or secondary aliphatic alcohol or an olefin oxide, the
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