The present invention is concerned with a novel process for the manufacture of 4alkanoyloxy-2,3,5-trimethylphenyl (E/Z)-phytyl ethers, precursors of α-tocopheryl alkanoates, by cross-metathesis reaction of alkenyl ethers of 1-alkanoyloxy-2,3,6-trimethylhydroquinone with 2,6,10,14-tetramethylpentadecene or a phytol derivative, e.g. an ester, an ether or a silyl ether, in the presence of a cross-metathesis catalyst. As the crossmetathesis catalyst especially ruthenium metal carbene complexes are suitable which possess (a) ruthenium metal center(s), have an electron count of 16 or 18 and are penta- or hexa-coordinated. A further object of the invention is a process for the manufacture of atocopheryl alkanoates comprising this reaction.
                            本发明涉及一种新型的制备4-烷酰氧基-2,3,5-三甲基苯基(E/Z)-蕴含醇醚的方法,这是α-
生育酚烷酸酯的前体,通过1-烷酰氧基-2,3,6-三甲基对苯
二醚的
烯丙基醚与2,6,10,14-四甲基十五碳烯或蕴含醇的衍
生物,例如酯,醚或
硅醚,在交叉烯丙基反应催化剂的存在下进行反应。作为交叉烯丙基反应催化剂,特别适用于具有(a)
钌金属中心,电子数为16或18,五价或六价配位的
钌金属卡宾配合物。本发明的另一个目的是通过这种反应制备α-
生育酚烷酸酯的方法。