| http://www.w3.org/ns/prov#value | - e effected by suitable compounds, such as acids or acid derivatives, e.g. benzoyl chloride, phthaloyl chloride, phosphinous, phosphonous and/or phosphorous acid, phosphinic, phosphoric and/or phosphoric acid and the acidic esters of the last-mentioned 6 acid types, sulphuric acid and its acidic esters and/or sulphonic acids.The preparation of the unsaturated urethanes essential to the invention ca
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