The present invention relates to a novel process for the manufacture of alkenylated aromatic compounds featuring at least one hydroxy group, their ring-closure reactions to chroman derivatives, as well as the acylation of the latter and the aromatic compounds featuring at least one hydroxy group themselves. The present invention relates especially to a process for the manufacture of tocol, tocopherols and their alkanoates such as α-tocopherol (TCP) and alkanoates (TCPA) thereof, preferably α-tocopheryl acetate (TCPAc). The processes of the present invention are characterized in that at least one step of the processes is carried out in the presence of an indium salt as the catalyst. Thus, an object of the present invention is the use of an indium salt as the catalyst in Friedel-Crafts alkylation reactions of aromatic compounds featuring at least one hydroxy group and ring-closure reactions of the latter to produce chroman-ring compounds in organic solvents. According to another aspect of the invention indium salts can be used as the catalyst in processes for the manufacture of tocyl alkanoates, tocopheryl alkanoates and alkanoates of aromatic compounds featuring at least one hydroxy group by reacting tocols, tocopherol and aromatic compounds featuring at least one hydroxy group, respectively, with an acylating agent. Suitable indium salts are indium(III) salts, especially indium trichloride, indium tribromide or indium triiodide, indium(III) triflate, indium(III) bis(trifluoromethanesulfonamide) and indium(III) acetate. In preferred embodiments of the invention the processes are carried out at a pressure of at least 0.96 bar, whereby the acylation can be carried out at an absolute pressure of at least 0.02 bar.
本发明涉及一种新工艺,用于制造具有至少一个羟基的烯化芳香族化合物、其与
色烷衍
生物的闭环反应,以及后者和具有至少一个羟基的芳香族化合物本身的酰化。本发明尤其涉及一种制造
生育酚、
生育酚及其烷酸酯(如α-
生育酚(
TCP)及其烷酸酯(
TCPA)),最好是
α-生育酚乙酸酯(
TCPAc)的工艺。本发明工艺的特点在于,工艺中至少有一步是在有
铟盐作为催化剂的情况下进行的。因此,本发明的一个目的是将
铟盐作为催化剂用于具有至少一个羟基的芳香族化合物的弗里德尔-卡夫斯烷基化反应,以及后者在有机溶剂中生成
铬环化合物的闭环反应。根据本发明的另一个方面,
铟盐可作为催化剂用于制造
生育酚烷酸酯、
生育酚烷酸酯和具有至少一个羟基的芳香族化合物烷酸酯的工艺中,方法是将
生育酚、
生育酚和具有至少一个羟基的芳香族化合物分别与酰化剂反应。合适的
铟盐是
铟(III)盐,特别是
三氯化铟、三
溴化
铟或三
碘化铟、三酸
铟(III)、双(三
氟甲磺酰胺)
铟(III)和
乙酸铟(III)。在本发明的优选实施方案中,该工艺在至少 0.96 巴的压力下进行,其中酰化可在至少 0.02 巴的绝对压力下进行。