与5-HMF(C 6 H 6 O 3)相比,当归内酯(C 5 H 6 O 2)是一种平台化合物,由于其中的C C键,具有更大的潜力可用于生物质衍生的高性能生物烷烃燃料的生产。分子结构,导致C–C偶联中间体(C10自聚集二聚体)和更高的C:O比(2.5),从而降低了后续加氢脱氧过程的氢消耗。生物质衍生的乙酰丙酸被用作生产C10支链烷烃的唯一起始原料。首先,乙酰丙酸的羧基和羰基官能团在催化下通过分子内酯化和脱水产生当归内酯,其包括当归内酯的两种异构体(α-当归内酯和β-当归内酯)。其次,当归内酯自聚集将获得当归内酯二/三聚体:α-当归内酯和β-当归内酯通过CC键耦合连接。最后,将这些中间产物在RANEY®催化剂上进行选择性加氢脱氧,以获得C7–C10支链烷烃。在483 K和5 MPa H 2下,收率接近90%,而C10支链烷烃产物3-乙基-4-甲基庚烷占75%。
Hydrodeoxygenation of the Angelica Lactone Dimer, a Cellulose-Based Feedstock: Simple, High-Yield Synthesis of Branched C<sub>7</sub>-C<sub>10</sub>Gasoline-like Hydrocarbons
作者:Mark Mascal、Saikat Dutta、Inaki Gandarias
DOI:10.1002/anie.201308143
日期:2014.2.10
solid acid catalysis and treatment of the resulting angelicalactone with catalytic K2CO3 produces the angelicalactonedimer in excellent yield. This dimer serves as a novel feedstock for hydrodeoxygenation, which proceeds under relatively mild conditions with a combination of oxophilic metal and noble metal catalysts to yield branched C7–C10 hydrocarbons in the gasoline volatility range. Considering that
生物质衍生的乙酰丙酸在固体酸催化下脱水,然后用催化的K 2 CO 3处理所得当归内酯,从而以极佳的收率生产了当归内酯二聚体。该二聚体可作为新型的加氢脱氧原料,在相对温和的条件下,结合亲氧性金属和贵金属催化剂进行合成,以产生汽油挥发性范围内的支链C 7 -C 10碳氢化合物。考虑到乙酰丙酸可从原始生物质中以> 80%的转化率获得,因此现场种植到桶装的纤维素汽油的产量可能会> 60%。
[EN] GASOLINE PREPARED FROM BIOMASS-DERIVED LEVULINIC ACID<br/>[FR] ESSENCE PRÉPARÉE À PARTIR D'ACIDE LÉVULINIQUE DÉRIVÉ D'UNE BIOMASSE
申请人:UNIV CALIFORNIA
公开号:WO2015073889A1
公开(公告)日:2015-05-21
The present invention provides methods for preparing a C6-C10 alkane, and mixture thereof. The methods include forming a reaction mixture containing an angelica lactone dimer, a catalyst, and a hydrogen source under conditions sufficient to reduce the angelica lactone dimer, thereby preparing the alkane. The methods can be used to prepare branched alkanes useful for fuels. Methods for preparing an angelica lactone, methods for preparing an angelica lactone dimer, and methods for reducing a lactone to an alkane are also described.
Making mercury-photosensitized dehydrodimerization into an organic synthetic method. Vapor-pressure selectivity and the behavior of functionalized substrates
作者:Stephen H. Brown、Robert H. Crabtree
DOI:10.1021/ja00190a031
日期:1989.4
Muedas, Cesar A.; Ferguson, Richard R.; Brown, Stephen H., Journal of the American Chemical Society, 1991, vol. 113, # 6, p. 2233 - 2242
作者:Muedas, Cesar A.、Ferguson, Richard R.、Brown, Stephen H.、Crabtree, Robert H.
DOI:——
日期:——
Direct photolysis at 185 nm of simple alkynes. Intra- and intermolecular hydrogen abstractions