申请人:KURARAY CO., LTD.
公开号:EP0030109A1
公开(公告)日:1981-06-10
A process for producing isoprene comprises decomposing a mixture containing at least two compounds of the formula
wherein (i) W and Y each represent hydrogen, and X and Z are identical or different and each represent the group OR, (ii) Wand X together form a single bond, Y represents hydrogen and Z represents the group OR, (iii) W represents hydrogen, X and Ytogetherform a single bond, and Z representsthe group OR, or(iv) W represents hydrogen, X represents the group OR, and Y and Z together form a single bond, in which R represents hydrogen, methyl, methoxymethyl, methylbutenyl, methylbutenyloxymethyl, 1,1-dimethyl-3-hydroxypropyl, 1,1-dimethyl- 3-hydroxypropyloxymethyl, 3-methyl-3-hydroxy-butyl, 3-methyl- 3-hydroxybutyloxy- methyl, 1,1-dimethyl-3-methoxypropyl, 1,1-dimethyl-3-methoxypropyloxymethyl, 3-methyl-3-methoxybutyl or 3-methyl-3- methoxybutyloxy-methyl, at least one compound of the mixture being a compound of general formula (I) in which R is substituted-oxymethyl in the presence of water and an oxygen-containing boron compound selected from boron-oxyacids and boron compounds capable of generating the boron-oxyacids in situ under the reaction conditions, in the liquid phase at a temperature of at least 150°C while adjusting the ratio of the oxygen-containing boron compound to the entire water present in the reaction system such thatthe weight ratio or othoboric acid to water, calculated on the assumption that all the oxygen-containing boron compound changes in aqueous solution to orthoboric acid, is at least 15:85.
生产异戊二烯的工艺包括分解含有至少两种式子化合物的混合物,其中
其中(i)W和Y各自代表氢,X和Z相同或不同且各自代表OR基团,(ii)W和X共同形成单键,Y代表氢,Z代表OR基团,(iii)W代表氢,X和Y共同形成单键,Z代表OR基团,或(iv)W代表氢,X代表OR基团,Y和Z共同形成单键、其中 R 代表氢、甲基、甲氧基甲基、甲基丁烯基、甲基丁烯氧基甲基、1,1-二甲基-3-羟基丙基、1、1,1-二甲基-3-羟基丙氧基甲基、1,1-二甲基-3-羟基丙氧基甲基、3-甲基-3-羟基丁氧基甲基、3-甲基-3-羟基丁氧基甲基、1,1-二甲基-3-甲氧基丙基、1,1-二甲基-3-甲氧基丙氧基甲基、3-甲基-3-甲氧基丁基或 3-甲基-3-甲氧基丁酰氧基甲基,混合物中至少有一种化合物是通式(I)的化合物,其中 R 是取代-氧甲基,在水和含氧硼化合物存在下,该含氧硼化合物选自硼氧酸和能在反应条件下就地生成硼氧酸的硼化合物、在液相中,温度至少为 150°C,同时调整含氧硼化合物与反应体系中全部水的比 例,以假定所有含氧硼化合物在水溶液中都变为正硼酸为条件,计算出氧硼酸与水的 重量比至少为 15:85.