Aliphatic oligocarbonate polyols prepared in the presence of a catalyst and a process for preparing

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The present invention relates to aliphatic oligocarbonate polyols prepared by the transesterification of organic carbonates with aliphatic polyols in the presence of at least one catalyst which contains i) at least one rare earth metal or compounds thereof or ii) at least one metal of group III B of the periodic table of the elements or compounds thereof or iii) mixtures of i) and ii) and to a process for preparing the same.