1118-58-7Relevant articles and documents
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Gorin,Wassiljew,Pantelejewa
, (1948)
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Kenyon,Young
, p. 1452 (1938)
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Preparation method of 2-methyl-1,3-pentadiene
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Paragraph 0041-0043; 0049-0051, (2020/11/26)
The invention relates to a preparation method of 2-methyl-1,3-pentadiene. The preparation method comprises the following steps: in the presence of a supported metal catalyst and a catalyst assistant,carrying out a dehydration reaction on 2-methyl-2,4-pentanediol to obtain 2-methyl-1,3-pentadiene. According to the method, strong acid is not used as a catalyst, so the selectivity of a product is effectively improved, higher yield can be obtained, the problem of equipment corrosion is avoided, the service life of equipment is prolonged, environmental protection benefits are remarkable, and the method is environment-friendly. The 2-methyl-1,3-pentadiene prepared by the method is high in selectivity and high in yield, the generation of a byproduct, namely 4-methyl-1,3-pentadiene is effectivelyreduced, the cyclic application of the catalyst is realized, and the industrial large-scale production of ligustral is facilitated.
A process for preparing 2 - methyl - 1, 3 - pentadiene method (by machine translation)
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Paragraph 0018; 0021-0023; 0024; 0027-0029; 0030; 0033-0035, (2019/06/30)
A process for preparing 2 - methyl - 1, 3 - pentadiene method, relates to 2 - methyl - 1, 3 - pentadiene. The 2 - methyl - 2, 4 pentanediol remove one molecule of water, to obtain the 4 - methyl - 4 - pentene - 2 - ol; the 4 - methyl - 4 - pentene - 2 - ol to remove a water molecule, to obtain 2 - methyl - 1, 3 - pentadiene. The 2 - methyl - 1, 3 - pentadiene yield, 2 - methyl - 1, 3 - pentadiene and 4 - methyl - 1, 3 pentadiene ratio can be increased to 9:1, 2 - methyl - 1, 3 - pentadiene and production yield is greater than 80%. The use of weakly acidic catalyst, to reduce the loss of the device. Selecting mild catalyst, to reduce the loss of the device, improves the reaction environment-friendly. The method of dewatering step by step, the reaction greatly reduces the 4 - methyl - 1, 3 pentadiene generation, improves the 2 - methyl - 1, 3 pentadiene yield. (by machine translation)
Process for dehydrating 2-methylpentane-2,4-diol
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Page/Page column 2-3, (2008/06/13)
A process for dehydrating 2-methylpentanediol-2,4 to a mixture of 2-methyl-1,3-pentadiene and 4-methyl-1,3-pentadiene at elevated temperature in the presence of an acid catalyst using a polyglycol ether as a heat carrier, wherein a polyglycol ether containing from 80 to 100% by weight of a polyethylene glycol dimethyl ether of the formula CH3(OCH2CH2)nOCH3 where n=2-8 and from 0 to 20% by weight of a polyethylene glycol monomethyl ether of the formula CH3(OCH2CH2)nOH where n=2-8 based in each case on the total mass of polyglycol ether, is used.