| http://www.w3.org/ns/prov#value | - the said reduction reaction is performed in the presence or absence of an electron donor compound chosen from among organic compounds comprising at least one atom of oxygen, sulphur, nitrogen and/or phosphorus, such as amines, amides, phosphines, sulphoxides, sulphones or ethers; more particularly from among the ethers preference may be given to aliphatic ether oxides of the formula R12 OR13, in w
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