申请人:NANJING UNIVERSITY OF TECHNOLOGY
公开号:US20140378711A1
公开(公告)日:2014-12-25
Provided in the present invention is a method for synthesizing 2,7-dimethyl-2,4,6-octatriene-1,8-dialdehyde. The synthesis method comprises the following steps: (1) adding acetaldehyde diethyl acetal and ethyl-(1-propenyl)-ether under the effect of a catalyst to produce 1,1,3-triethoxy-2-methyl-butane; (2) pyrolysis synthesizing 1,1,3-triethoxy-2-methyl-butane under the catalytic effects of isoquinoline and p-Toluenesulfonic acid to produce 1-methoxy-2-methyl-1,3-butadiene; (3) dissolving 1-methoxy-2-methyl-1,3-butadiene in anhydrous ethanol solvent for synthesis with a phase transfer catalyst, cetyl-trimethyl ammonium bromide, and a chlorinating agent, trichloroisocyanuric acid, to generate 4,4-diethoxy-3-methyl-1-chloro-butene; (4) combining 4,4-diethoxy-3-methyl-1-chloro-butene with a triphenylphosphine salt to produce a phosphonium salt; and (5) condensing the phosphonium salt under the effects of hydrogen peroxide in conjunction with sodium carbonate solution to generate 1,1,8,8-tetramethyl-2,7-dimethyl-2,4,6-octatriene; then hydrolyzing under acidic conditions to synthesize 2,7-dimethyl-2,4,6-octatriene-1,8-dialdehyde. The present invention has a simple process route, is easy to operate, and has mild conditions, great yield, and great industrial value.
本发明提供了一种合成2,7-二甲基-2,4,6-辛三烯-1,8-二醛的方法。合成方法包括以下步骤:(1) 在催化剂的作用下,将乙醛二乙醚和乙基-(1-丙烯基)-醚加入以产生1,1,3-三乙氧基-2-甲基-丁烷;(2) 在异喹啉和对甲苯磺酸的催化作用下,热解合成1,1,3-三乙氧基-2-甲基-丁烷以产生1-甲氧基-2-甲基-1,3-丁二烯;(3) 将1-甲氧基-2-甲基-1,3-丁二烯溶解在无水乙醇溶剂中,与相转移催化剂十六烷基三甲基溴化铵和氯化剂三氯异氰酸酯合成,生成4,4-二乙氧基-3-甲基-1-氯-丁烯;(4) 将4,4-二乙氧基-3-甲基-1-氯-丁烯与三苯基膦盐结合产生膦盐;(5) 在过氧化氢的作用下,与碳酸钠溶液一起对膦盐进行缩合,生成1,1,8,8-四甲基-2,7-二甲基-2,4,6-辛三烯;然后在酸性条件下水解,合成2,7-二甲基-2,4,6-辛三烯-1,8-二醛。本发明具有简单的工艺路线,易于操作,条件温和,产率高,具有很大的工业价值。