Process for the production of 5-ethylidene norbornene-2专利检索-路易斯碱酸，碱，盐，酸酐和碱专利检索查询-专利查询网

Process for the production of 5-ethylidene norbornene-2

阅读：242发布：2022-12-13

专利汇可以提供Process for the production of 5-ethylidene norbornene-2专利检索，专利查询，专利分析的服务。并且A process is disclosed for preparing 5-ethylidene norbornene-2 at high yield and with minimum cost. The process is characterized by the Diels-Alder reaction of 3-halobutene-1 with cyclopentadiene, whereby there is produced 5-haloethyl norbornene-2. This product is dehydrohalogenated with use of a Lewis base thereby obtaining 5-ethylidene norbornene-2.，下面是Process for the production of 5-ethylidene norbornene-2专利的具体信息内容。

权利要求

2. The process as defined in claim 1 wherein halogen in said 3-halobutene-1 is chlorine.

3. The process as defined in claim 1 wherein halogen in said 3-halobutene-1 is bromine.

4. A process of preparing 5-ethylidene norbornene-2 which comprises subjecting 3-halobutene-1 to the Diels-Alder reaction with cyclopentadiene at 150*-250*C, distilling the resulting reaction mixture to separate 5-haloethyl norbornene-2, and dehydrohalogenating the resulting 5-haloethyl norbornene-2 with use of a Lewis base at 30*-200*C.

5. The process as defined in claim 1 wherein said Lewis base is a member selected from the group consisting of alkali hydroxides, alkali metal alkoxides, alkali metal amides, alkali metal carbonates, alkali metal salts of organic acids, alkaline earth metal oxides and hydroxides, alkaline earth metal alkoxides and amides and tertiary amines or mixtures thereof.

6. A process of preparing 5-ethylidene norbornene-2 which comprises subjecting 3-halobutene-1 to the Diels-Alder reaction with cyclopentadiene to form 5-haloethyl norbornene-2, and dehydrohalogenating the resulting 5-haloethyl norbornene-2 with use of a Lewis base, said Diels-Alder reaction being conducted at temperatures ranging between 150* and 250*C and in the presence of an inhibitor.

7. The process as defined in claim 6 wherein said inhibitor is hydroquinone.

8. The process as defined in claim 6 wherein said inhibitor is catechol.

9. The process as defined in claim 1 wherein the Diels-Alder reaction takes place with dicyclopentadiene.

10. The process as defined in claim 1 wherein the mol ratio of said 3-halobutene-1 to said cyclopentadiene is in the range of 0.1 to 10.

11. The process as defined in claim 1 wherein the mol ratio of said Lewis base to said 5-haloethyl norbornene-2 is in the range of 1 to 2.

12. The process as defined in claim 1 wherein said dehydrohalogenation is conducted in the presence of a solvent selected from the group consisting of water, methanol, ethanol, 1-butanol, acetone, dimethyl formamide, dimethylacetamide, acetonitrile, nitrobenzene, sulfolan, dimethylsulfoxide, N-methyl pyrrolidone and hexamethyl phosphor triamide.

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Process for the production of 5-ethylidene norbornene-2

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