申请人:Hoechst Aktiengesellschaft
公开号:US05300717A1
公开(公告)日:1994-04-05
In a multi-step process, dixylylpropane is obtained inter alia via the hitherto unknown 1,2-dimethyl-4-(.alpha.-chloroisopropyl)benzene, the readily accessible compounds o-xylene and propene being employed as starting compounds. The process yields the desired compound in high yield and isomer purity and is distinguished by a small amount of by-products. It is therefore particularly suitable for further processing without problems. The process involves the sequence of (a) Friedel-Crafts alkylation of ortho-xylene with propylene, (b) dehydrogenation of the isoproplyxlene into isopropenylxylene, (c) which is then hydrochlorinated into chloroisopropylxylene, (d) and then alkylated with a second ortho-xylene modecule to obtain the final product dixylylpropane.
在一个多步骤的过程中,二甲基丙烷通过迄今为止未知的1,2-二甲基-4-(α-氯异丙基)苯得到,可使用易得的邻二甲苯和丙烯作为起始化合物。该过程高产率和异构体纯度产生所需的化合物,并且副产物很少。因此,它特别适用于无问题的进一步加工。该过程涉及以下步骤:(a)用丙烯对邻二甲苯进行Friedel-Crafts烷基化,(b)将异丙基苯脱氢成异丙烯基苯,(c)然后对其进行氯化得到氯异丙基苯,(d)然后与第二个邻二甲苯分子发生烷基化反应,得到最终产品二异丙基丙烷。