85-43-8Relevant articles and documents
Method for preparing butane tetracarboxylic dianhydride
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Page/Page column 4-6, (2018/10/11)
The invention discloses a method for preparing butane tetracarboxylic dianhydride, and belongs to the field of fine chemical preparation methods. The method comprises the following steps: using maleicanhydride and 1,3-butadiene as starting materials to synthesize tetrahydrophthalic anhydride as an intermediate product through a 1,4-addition reaction in a high temperature molten state; subjectingtetrahydrophthalic anhydride to hydrolysis, ozone oxidation, hydrogen peroxide oxidation reaction to obtain butane tetracarboxylic acid as an intermediate product; using acetic anhydride or propionicanhydride as a dehydrating agent, and subjecting the butane tetracarboxylic acid to synthesize butane tetracarboxylic dianhydride through dehydration closed-ring. Compared with the traditional process, the method has the advantages of mild reaction conditions, high product purity, high yield, and no pollution, and is suitable for large-scale industrial production.
Solvent-free Diels-Alder reaction in a closed batch system
Sun, Daolai,Sato, Fumiya,Yamada, Yasuhiro,Sato, Satoshi
, p. 276 - 282 (2013/05/08)
Solvent-free Diels-Alder reactions were carried out by heating a mixture of a volatile diene, such as 1,3-butadiene, isoprene, or 2,3-dimethyl-1,3- butadiene, and a dienophile, such as methyl vinyl ketone, methyl acrylate, or maleic anhydride, in a closed batch reactor. High yields of Diels-Alder products were obtained without using solvents and catalysts within a short reaction time in most of the reactions. In particular, several reactions of dienophiles with 1,3-butadiene, which is known as a diene with low reactivity because of its gaseous form, also proceeded with high yields of Diels-Alder products in the closed batch reactor under conditions pressured by the reactant vapor. Solvent-free reactions provided high yields compared to reactions in solvent since the reaction heat directly resulted in increasing the reaction temperature and pressure. Energy in the exothermic reaction was used effectively in the closed batch system under solvent-free conditions.
Synthetic approach to cis and trans-decalins via Diels - Alder reaction and ring-closing metathesis as key steps: Further extension to dioxapropellane derivative by ring-closing metathesis
Kotha, Sambasivarao,Chavan, Arjun S.,Dipak, Mirtunjay Kumar
scheme or table, p. 501 - 504 (2011/03/18)
9,10-Substituted cis and trans-decalins were synthesized by a simple route using the Diels-Alder reaction and ring-closing metathesis (RCM) as key steps. Later, the cis-decalin system has been extended to 3,8-dioxa[8.4.4]propellane derivative by RCM sequence as a key step. Copyright