| http://www.w3.org/ns/prov#value | - 14.2 Compounds of the formula Iu2 are prepared by reacting compounds of the formula Ic and Id with an alcohol of the formula HX--C1 -C4 alkyl in the presence of an acid catalyst, for example sulfuric acid, p-toluenesulfonic acid or oxalic acid, with or without an addition of a Lewis acid, for example AlCl3 or boron trifluoride etherate, with azeotropic distillation or by means of a molecular sieve
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