| http://www.w3.org/ns/prov#value | - Tertiary butanol and isopropanol are especially preferred as the preferred alcohols of the general formulae R3 R4 HCOH and R3 R4 R5 COH respectively, in which R3, R4 and R5 represent identical or different, straight, chain saturated alkyl groups each having from 1 to 6 carbon atoms, or R3 and R4 together represent an alkylene group having 4 to 5 carbon atoms.
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