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    Process for the preparation of aliphatic carbonates having a six-membered ring
    3.
    发明授权
    Process for the preparation of aliphatic carbonates having a six-membered ring 失效
    制备具有六元环的脂族碳酸酯的方法

    公开(公告)号：US5861107A

    公开(公告)日：1999-01-19

    申请号：US877386

    申请日：1997-06-17

    申请人： Hans-Josef Buysch ,  Gerd Fengler ,  Karl-Heinz Neumann ,  Paul Wagner ,  Martin Melchiors ,  Wieland Hovestadt

    发明人： Hans-Josef Buysch ,  Gerd Fengler ,  Karl-Heinz Neumann ,  Paul Wagner ,  Martin Melchiors ,  Wieland Hovestadt

    IPC分类号： C07D319/06 ,  C09K3/00 ,  C07D321/00

    CPC分类号： C07D319/06

    摘要： The invention relates to a process for the preparation of carbonates having a six-membered ring, of the formula ##STR1## by transesterification of 1,3-propanediol compounds with carbonic acid esters and subsequent distillative depolymerization of the oligo- or polycarbonate initially formed, one or more catalysts from the group consisting of compounds of Sn, Ti or Zr being employed both for the transesterification and for the depolymerization and, if appropriate, the distillation residue is at least partly recycled into the transesterification. Such carbonates having a six-membered ring can furthermore be stabilized against undesirable polymerization by addition of small amounts of acids of sulfur or phosphorus or esters or salts thereof.

    摘要翻译： 本发明涉及一种通过1,3-丙二醇化合物与碳酸酯的酯交换反应制备具有下式（VI）的六元环的碳酸酯的方法，随后将低聚物或聚碳酸酯进行蒸馏解聚 最初形成的一种或多种由Sn，Ti或Zr化合物组成的组的催化剂用于酯交换和解聚，如果合适的话，蒸馏残余物至少部分地被再循环到酯交换中。 具有六元环的这种碳酸酯还可以通过加入少量的硫或磷酸或其酯或其盐来稳定而防止不期望的聚合。