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Journal articles on the topic 'Carboxylate assistance'

Author: Grafiati
Published: 4 June 2021
Last updated: 10 February 2022

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1

Schinkel, Marvin, Jan Wallbaum, Sergei I. Kozhushkov, Ilan Marek, and Lutz Ackermann. "Carboxylate Assistance for Catalyzed Hydroarylations of Methylenecyclopropanes." Organic Letters 15, no. 17 (August 19, 2013): 4482–84. http://dx.doi.org/10.1021/ol402037f.

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2

Schinkel, Marvin, Jan Wallbaum, Sergei I. Kozhushkov, Ilan Marek, and Lutz Ackermann. "ChemInform Abstract: Carboxylate Assistance for Catalyzed Hydroarylations of Methylenecyclopropanes." ChemInform 45, no. 5 (January 16, 2014): no. http://dx.doi.org/10.1002/chin.201405050.

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3

Li, Jie, and Lutz Ackermann. "Carboxylate-assisted ruthenium(ii)-catalyzed C–H activations of monodentate amides with conjugated alkenes." Organic Chemistry Frontiers 2, no. 9 (2015): 1035–39. http://dx.doi.org/10.1039/c5qo00167f.

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4

Hubrich, Jonathan, Thomas Himmler, Lars Rodefeld, and Lutz Ackermann. "Ruthenium(II)-Catalyzed C–H Arylation of Azoarenes by Carboxylate Assistance." ACS Catalysis 5, no. 7 (June 9, 2015): 4089–93. http://dx.doi.org/10.1021/acscatal.5b00939.

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5

Sun, Qian, Ai-Ling Cheng, Kun Wang, Xiu-Chun Yi, and En-Qing Gao. "Chiral or achiral: four isomeric Cd(ii) coordination polymers based on phenylenediacrylate ligands." CrystEngComm 17, no. 6 (2015): 1389–97. http://dx.doi.org/10.1039/c4ce02019g.

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The isomeric coordination polymers derived fromp- andm-phenylenediacrylates contain similar homochiral motifs (hydrogen-bonded layers or μ-Ocarboxylatebridged helical chains), but only themligand, with assistance of hydrogen bonds, induces spontaneous resolution to generate 3D homochiral networks.
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6

Wang, Na, Hongxin Liu, Hang Gao, Jiafeng Zhou, Longzhangdi Zheng, Juan Li, Hong-Ping Xiao, Xinhua Li, and Jun Jiang. "Ni(II)-Catalyzed Enantioselective Synthesis of β-Hydroxy Esters with Carboxylate Assistance." Organic Letters 21, no. 17 (August 8, 2019): 6684–89. http://dx.doi.org/10.1021/acs.orglett.9b02297.

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7

Hrovat, Sara, Miha Drev, Uroš Grošelj, Franc Perdih, Jurij Svete, Bogdan Štefane, and Franc Požgan. "Conformationally Driven Ru(II)-Catalyzed Multiple ortho-C–H Bond Activation in Diphenylpyrazine Derivatives in Water: Where Is the Limit?" Catalysts 10, no. 4 (April 12, 2020): 421. http://dx.doi.org/10.3390/catal10040421.

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Ru(II)/carboxylate/PPh3 catalyst system enabled the preparation of highly conjugated pyrazine derivatives in water under microwave irradiation. Both nitrogen atoms efficiently dictated cleavage of the ortho-C–H bonds in both benzene rings of 2,3-diphenylpyrazine substrates through chelation assistance. In conformationally more flexible diphenyldihydropyrazine 1, the arylation of four ortho-C–H bonds was possible, while in the aromatic analog 2, the triarylation was the limit.
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8

Huang, Mei-Fang, Yi-Reng Lin, Yu-Tzu Chang, Yow-Ling Shiue, and Shih-Shin Liang. "Reductive amination assistance for quantification of oseltamivir phosphate and oseltamivir carboxylate by HPLC-MS/MS." Journal of Chromatography B 1087-1088 (June 2018): 23–28. http://dx.doi.org/10.1016/j.jchromb.2018.03.040.

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9

Ackermann, Lutz. "Robust Ruthenium(II)-Catalyzed C–H Arylations: Carboxylate Assistance for the Efficient Synthesis of Angiotensin-II-Receptor Blockers." Organic Process Research & Development 19, no. 1 (January 5, 2015): 260–69. http://dx.doi.org/10.1021/op500330g.

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10

Ackermann, Lutz. "ChemInform Abstract: Robust Ruthenium(II)-Catalyzed C-H Arylations: Carboxylate Assistance for the Efficient Synthesis of Angiotensin-II-Receptor Blockers." ChemInform 46, no. 15 (March 26, 2015): no. http://dx.doi.org/10.1002/chin.201515325.

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11

Xie, Peipei, Wei Guo, Dimei Chen, and Yuanzhi Xia. "Multiple pathways for C–H cleavage in cationic Cp*Rh(iii)-catalyzed C–H activation without carboxylate assistance: a computational study." Catalysis Science & Technology 8, no. 16 (2018): 4005–9. http://dx.doi.org/10.1039/c8cy00870a.

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12

Doi, Joyce Takahashi, Marvin H. Goodrow, and W. Kenneth Musker. "Neighboring group participation in organic redox reactions. 11. Anchimeric assistance by the carboxylate anion in aqueous iodine oxidations of 3-(alkylthio)propanoates." Journal of Organic Chemistry 51, no. 7 (April 1986): 1026–29. http://dx.doi.org/10.1021/jo00357a015.

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13

Hu, Zhijun, Rui Zhai, Jing Li, Yan Zhang, and Jiang Lin. "Preparation and Characterization of Nanofibrillated Cellulose from Bamboo Fiber via Ultrasonication Assisted by Repulsive Effect." International Journal of Polymer Science 2017 (2017): 1–9. http://dx.doi.org/10.1155/2017/9850814.

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Nanofibrillated celluloses (NFCs) have recently drawn much attention because of their exceptional physicochemical properties. However, the existing preparation procedures either produce low yields or severely degrade the cellulose and, moreover, are not energy efficient. The purpose of this study was to develop a novel process using ultrasonic homogenization to isolate fibrils from bamboo fiber (BF) with the assistance of negatively charged entities. The obtained samples were characterized by the degree of substitution (DS) of carboxymethyl, Fourier-transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), thermogravimetric analysis, and transmission electron microscopy (TEM). The results showed that an NFC yield could be obtained above 70% through this route. The enzyme hydrolysis could enhance the surface charge of the fiber, and mechanical activation facilitates an increase in the DS. The disintegrating efficiency of the cellulose fibrils significantly depended on the input power of ultrasonication and the DS. FT-IR spectra confirmed the occurrence of the carboxymethylation reaction based on the appearance of the characteristic signal for the carboxyl group. From XRD analysis, it was observed that the presence of the carboxyl groups makes the isolation more efficient attributed to the ionic repulsion between the carboxylate groups of the cellulose chains.
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14

Ackermann, Lutz, Korkit Korvorapun, Ramesh C. Samanta, and Torben Rogge. "Remote C–H Functionalizations by Ruthenium Catalysis." Synthesis 53, no. 17 (April 19, 2021): 2911–46. http://dx.doi.org/10.1055/a-1485-5156.

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AbstractSynthetic transformations of otherwise inert C–H bonds have emerged as a powerful tool for molecular modifications during the last decades, with broad applications towards pharmaceuticals, material sciences, and crop protection. Consistently, a key challenge in C–H activation chemistry is the full control of site-selectivity. In addition to substrate control through steric hindrance or kinetic acidity of C–H bonds, one important approach for the site-selective C–H transformation of arenes is the use of chelation-assistance through directing groups, therefore leading to proximity-induced ortho-C–H metalation. In contrast, more challenging remote C–H activations at the meta- or para-positions continue to be scarce. Within this review, we demonstrate the distinct character of ruthenium catalysis for remote C–H activations until March 2021, highlighting among others late-stage modifications of bio-relevant molecules. Moreover, we discuss important mechanistic insights by experiments and computation, illustrating the key importance of carboxylate-assisted C–H activation with ruthenium(II) complexes.1 Introduction2 Stoichiometric Remote C–H Functionalizations3 meta-C–H Functionalizations4 para-C–H Functionalizations5 meta-/ortho-C–H Difunctionalizations6 Conclusions
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15

Wojtas, K. Philip, Jin-Yong Lu, Daniel Krahn, and Hans-Dieter Arndt. "Regioselective Functionalization of 3-Hydroxy-pyridine Carboxylates by Neighboring Group Assistance." Chemistry - An Asian Journal 11, no. 20 (September 16, 2016): 2859–62. http://dx.doi.org/10.1002/asia.201601111.

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16

Potvin, Pierre G., Phuong Uyen Luyen, and Jan Bräckow. "Electrostatic Bubbles and Supramolecular Assistance of Photosensitization by Carboxylated Ru(II) Complexes." Journal of the American Chemical Society 125, no. 16 (April 2003): 4894–906. http://dx.doi.org/10.1021/ja028671f.

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17

Whitney, Spencer M., and T. John Andrews. "The CO2/O2 specificity of single-subunit ribulose-bisphosphate carboxylase from the dinoflagellate, Amphidinium carterae." Functional Plant Biology 25, no. 2 (1998): 131. http://dx.doi.org/10.1071/pp97131.

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Some dinoflagellates have been shown recently to be unique among eukaryotes in having a ribulose-bisphosphate carboxylase-oxygenase (Rubisco, EC 4.1.1.39) composed of only one type of subunit, the 53-kDa large subunit [reviewed by Palmer, J.D. (1996) Plant Cell 8, 343–345]. Formerly, such homomeric Rubiscos had been found only in anaerobic bacteria and are characterised by such poor abilities to discriminate against the competitive alternate substrate, O2, that they would not be able to support net carbon gain if exposed to the current atmospheric CO2/O2 ratio. The capacity of Rubiscos from aerobic organisms to discriminate more effectively against O2 appeared to correlate with the presence of additional 12- to 18-kDa small subunits. Thus the CO2/O2 specificity of the homomeric dinoflagellate Rubisco is of considerable interest from the structural, physiological and evolutionary viewpoints. However, for unknown reasons, Rubiscos from dinoflagellates studied so far are so unstable after extraction from the cells that kinetic characterisation has not been possible. We redesigned two methods for measuring Rubisco’s CO2/O2 specificity to adapt them to rapid measurement at 10°C using unfractionated cell extracts. Both methods revealed that the CO2/O2 specificity of Rubisco from the dinoflagellate, Amphidinium carterae Hulburt, was approximately twice as great as that of other homomeric Rubiscos but unlikely to be sufficient to support dinoflagellate photosynthesis without assistance from an inorganic-carbon-concentrating mechanism.
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18

Abdu, Hassan Idris, Kamel Eid, Aboubakr M. Abdullah, Zhengang Han, Mohammed Hassan Ibrahim, Duoliang Shan, Jing Chen, Ahmed A. Elzatahry, and Xiaoquan Lu. "Unveiling one-pot scalable fabrication of reusable carboxylated heterogeneous carbon-based catalysts from eucalyptus plant with the assistance of dry ice for selective hydrolysis of eucalyptus biomass." Renewable Energy 153 (June 2020): 998–1004. http://dx.doi.org/10.1016/j.renene.2020.02.034.

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19

DOI, J. T., M. H. GOODROW, and W. K. MUSKER. "ChemInform Abstract: Neighboring Group Participation in Organic Redox Reactions. Part 11. Anchimeric Assistance by the Carboxylate Anion in Aqueous Iodine Oxidations of 3-(Alkylthio)-propanoates." Chemischer Informationsdienst 17, no. 36 (September 9, 1986). http://dx.doi.org/10.1002/chin.198636133.

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20

Zhu, Shenghu, Linshu Guan, Xuemei Tan, Guoquan Li, Changjie Sun, Meng Gao, Bao Zhang, and Lina Xu. "Hepatoprotective Effect and Molecular Mechanisms of Hengshun Aromatic Vinegar on Non-Alcoholic Fatty Liver Disease." Frontiers in Pharmacology 11 (December 4, 2020). http://dx.doi.org/10.3389/fphar.2020.585582.

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Aromatic vinegar with abundant bioactive components can be used as a food additive to assist the treatment of various diseases. However, its effect on non-alcoholic fatty liver disease (NAFLD) is still unknown. The purpose of this study was to investigate the mechanism of Hengshun aromatic vinegar in preventing NAFLD in vivo and in vitro. Aromatic vinegar treatment was applied to rats fed with a high-fat diet (HFD) and HepG2 cells challenged with palmitic acid (PA). Our results showed that aromatic vinegar markedly improved cell viabilities and attenuated cell damage in vitro. The levels of TC, TG, FFA, AST, ALT, and malondialdehyde (MDA) in HFD-induced rats were significantly decreased by aromatic vinegar. Mechanism investigation revealed that aromatic vinegar markedly up-regulated the level of silent information regulator of transcription 1 (Sirt1), and thereby inhibited inflammation of the pathway through down-regulating the expressions of high mobility group box 1, toll-likereceptor-4, nuclear transcription factor-κB, tumor necrosis factor receptor-associated factor-6, and inflammatory factors. Aromatic vinegar simultaneously increased the expression of farnesoid X receptor and suppressed expressions of lipogenesis related proteins, including fatty acid synthase, acetyl-CoA carboxylase-1, sterol regulatory element binding transcription factor 1, and stearoyl-CoA desaturase-1. These results were further validated by knockdown of Sirt1 using siRNAs silencing in vitro. In conclusion, Hengshun aromatic vinegar showed protective effects against NAFLD by enhancing the activity of SIRT1 and thereby inhibiting lipogenesis and inflammation pathways, which is expected to become a new assistant strategy for NAFLD therapy in the future.
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