Sex attractants of geometrid and noctuid moths: Chemical characterization and field test of monoepoxides of 6,9-dienes and related compounds
摘要:
(Z,Z)-6,9-Dienes with straight C-18-C-23 chains were synthesized from linoleic acid, and a C-17 chain was synthesized by hydrogenation of the corresponding 6,9-diyne prepared from propargyl alcohol. Oxidation of the homoconjugated dienes with m-chloroperoxybenzoic acid yielded a 1:1 mixture of two monoepoxides that could be separated by repeated medium-pressure liquid chromatography with a Lobar column. The chemical structure of each positional isomer was confirmed by analyses of the ozonolysis products, and the isomers showed characteristic C-13 signals in their NMR spectra and fragment ions in their EI mass spectra. In addition to the (Z,Z,Z)-3,6,9-trienes with straight C-18-C-23 chains and their monoepoxides, field tests using single source lures incorporating one of the above seven dienes and 14 monoepoxymonoenes were carried out in a forest in Tokyo from 1992 to 1994. Consequently, attraction of six geometrid species and five noctuid species was observed for the first time.
Catalyst‐Free Decarboxylation of Carboxylic Acids and Deoxygenation of Alcohols by Electro‐Induced Radical Formation
作者:Xiaoping Chen、Xiaosheng Luo、Xiao Peng、Jiaojiao Guo、Jiantao Zai、Ping Wang
DOI:10.1002/chem.201905224
日期:2020.3.12
derived from naturally abundant carboxylic acids and alcohols provides a sustainable and inexpensive approach to radical formation via undivided electrochemical cells. The resulting radicals are trapped by an electron-poor olefin or hydrogen atom source to furnish the Giese reaction or reductive decarboxylation products, respectively. A broad range of carboxylic acid (1°, 2°, and 3°) and alcohol (2° and
Light-Driven Enzymatic Decarboxylation of Fatty Acids
作者:Mieke M. E. Huijbers、Wuyuan Zhang、Fabio Tonin、Frank Hollmann
DOI:10.1002/anie.201807119
日期:2018.10.8
The photoenzymatic decarboxylation of fatty acids to alkanes is proposed as an alternative approach for the synthesis of biodiesel. By using a recently discovered photodecarboxylase from Chlorella variabilis NC64A (CvFAP) we demonstrate the irreversible preparation of alkanes from fatty acids and triglycerides. Several fatty acids and their triglycerides are converted by CvFAP in near‐quantitative
A Reconstructed Common Ancestor of the Fatty Acid Photo‐decarboxylase Clade Shows Photo‐decarboxylation Activity and Increased Thermostability
作者:Yue Sun、Elia Calderini、Robert Kourist
DOI:10.1002/cbic.202000851
日期:2021.5.14
Enzyme resurrection strikes again: Ancestral sequence reconstruction was applied to a putative photo-decarboxylases clade. One common ancestor showed up to 12-fold production yield, a 15 °C increase in thermostability and up to 20-fold improvement in residual activity when incubated at 50 °C. Ancestral sequence reconstruction proved to be a valuable tool to introduce valid mutations to a little understood
酶再次复活:祖先序列重建被应用于假定的光脱羧酶进化枝。在 50 °C 下孵育时,一个共同祖先的产量提高了 12 倍,热稳定性提高了 15 °C,残留活性提高了 20 倍。祖先序列重建被证明是一种有价值的工具,可以向一种鲜为人知的脂肪酸光脱羧酶引入有效突变。
<scp>Visible‐Light Photoredox‐Catalyzed</scp>
Hydrodecarboxylation and Deuterodecarboxylation of Fatty Acids
作者:Yuan‐Li Sun、Fang‐Fang Tan、Rong‐Gui Hu、Chun‐Hong Hu、Yang Li
DOI:10.1002/cjoc.202200143
日期:2022.8.15
We develop an efficient visible-light photoreodox-catalyzed hydrodecarboxylation and deuterodecarboxylation of fatty acids for alkanes and deuterium alkanes. The key to the efficient transformation should attribute to the co-catalysis of the suitable methoxy substituted acridine photocatalyst (Mes-1,3,6,8-tetramethoxy-Acr-3”,5”-dimethoxy-Ph) and the hydrogen atom transfer catalyst 4′,4′-dimethyl diphenyldisulfane
Photocatalyzed hydrodecarboxylation of fatty acids: a prospective method to produce drop-in biofuels
作者:Amanda M. de Azevedo、Jhudson G. L. de Araujo、Maria do S. B. da Silva、Aecia S. D. dos Anjos、Aruzza M. M. de Araújo、Elisama V. dos Santos、Carlos Alberto Martínez-Huitle、Amanda D. Gondim、Lívia N. Cavalcanti
DOI:10.1039/d4ra01166j
日期:2024.3.26
photocatalyzed hydrodecarboxylation of fattyacids is reported herein. The catalytic system consists of a commercially available acridinium salt as the photocatalyst and thiophenol as the Hydrogen Atom Transfer (HAT) co-catalyst. Results evidenced that Cn-1 alkanes were obtained in yields up to 77%. Furthermore, the protocol was employed for a complex mixture of fattyacids bio-derived from a real sample of