| http://www.w3.org/ns/prov#value | - A specific means includes a method of increasing the amount of the catalyst used in the reaction of metallic magnesium and ethanol, for example, adding a catalyst such as iodine in the amount of 0.1 g or more, preferably 0.13 g or more, and particularly preferably 0.15 g or more for 1 g of the metallic magnesium, a method of increasing the rate of addition when the metallic magnesium and ethanol a
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