Structured Binder-Free Al-β Zeolite for Acid-Catalyzed Dehydration

<div>Catalytic carbonyl-olefin metathesis reactions have recently been developed as a powerful tool for carbon-carbon bond</div><div>formation. However, currently available synthetic protocols rely exclusively on aryl ketone substrates while the corresponding aliphatic analogs remain elusive. We herein report the development of Lewis acid-catalyzed carbonyl-olefin ring-closing metathesis reactions for aliphatic ketones. Mechanistic investigations are consistent with a distinct mode of activation relying on the in situ formation of a homobimetallic singly-bridged iron(III)-dimer as the active catalytic species. These “superelectrophiles” function as more powerful Lewis acid catalysts that form upon association of individual iron(III)-monomers. While this mode of Lewis acid activation has previously been postulated to exist, it has not yet been applied in a catalytic setting. The insights presented are expected to enable further advancement in Lewis acid catalysis by building upon the activation principle of “superelectrophiles” and broaden the current scope of catalytic carbonyl-olefin metathesis reactions.</div>

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Arylboronic Acid-Catalyzed C-Allylation of Unprotected Oximes

10.26434/chemrxiv.9728285.v1 ◽

2019 ◽

Cited By ~ 1

Author(s):

Juha Siitonen ◽

Padmanabha V. Kattamuri ◽

Muhammed Yousufuddin ◽

Laszlo Kurti

Keyword(s):

Total Synthesis ◽

Acid Catalysts ◽

Mechanistic Studies ◽

Arylboronic Acid ◽

Synthetic Utility ◽

Acid Catalyzed

Unprotected keto- and aldoximes are readily <i>C</i>-allylated with allyl diisopropyl boronate in the presence of arylboronic acid catalysts to yield highly-substituted <i>N</i>-alpha-secondary (2°) and tertiary (3°) hydroxylamines. The method’s synthetic utility is demonstrated with the total synthesis of the trace alkaloid <i>N</i>-methyl-euphococcine. Preliminary experimental and computational mechanistic studies point toward the formation of a boroxine as the active allylating species.<br>

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Brønsted acid catalyzed enantioselective inter and intramolecular α-amidoalkylation reactions in the synthesis of isoquinoline derivatives

10.3390/mol2net-02-h003 ◽

2016 ◽

Author(s):

Eider Aranzamendi Uruburu ◽

Nuria Sotomayor ◽

Esther Lete

Keyword(s):

Acid Catalyzed ◽

Isoquinoline Derivatives

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Synthesis, Characterization, and Catalytic Behavior of Biheteroatomic Fe-V-β Zeolite

CHINESE JOURNAL OF CATALYSIS (CHINESE VERSION) ◽

10.3724/sp.j.1088.2010.91233 ◽

2010 ◽

Vol 31 (6) ◽

pp. 705-710

Author(s):

Zhiwen XIAO ◽

Hongyun HE

Keyword(s):

Catalytic Behavior ◽

Β Zeolite

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A Self-Standing and Binder-Free CaV 6O 16·3H 2O Paper Electrodes for Lithium Ion Batteries

SSRN Electronic Journal ◽

10.2139/ssrn.3680270 ◽

2020 ◽

Author(s):

Shaoyan Zhang ◽

Liqiang Lv ◽

Juan Pei ◽

Min Lu ◽

Jianing Yang ◽

...

Keyword(s):

Lithium Ion Batteries ◽

Lithium Ion ◽

Binder Free

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Naturally Occurring Organic Acid-catalyzed Facile Diastereoselective Synthesis of Biologically Active (E)-3-(arylimino)indolin-2-one Derivatives in Water at Room Temperature

Current Organic Chemistry ◽

10.2174/1385272822666190924182538 ◽

2019 ◽

Vol 23 (16) ◽

pp. 1778-1788 ◽

Cited By ~ 5

Author(s):

Gurpreet Kaur ◽

Arvind Singh ◽

Kiran Bala ◽

Mamta Devi ◽

Anjana Kumari ◽

...

Keyword(s):

Room Temperature ◽

Biologically Active ◽

Environmentally Benign ◽

Diastereoselective Synthesis ◽

Substituted Anilines ◽

Reaction Conditions ◽

Naturally Occurring ◽

Acid Catalyzed ◽

Reaction Media ◽

Column Chromatographic

A simple, straightforward and efficient method has been developed for the synthesis of (E)-3-(arylimino)indolin-2-one derivatives and (E)-2-((4-methoxyphenyl)imino)- acenaphthylen-1(2H)-one. The synthesis of these biologically-significant scaffolds was achieved from the reactions of various substituted anilines and isatins or acenaphthaquinone, respectively, using commercially available, environmentally benign and naturally occurring organic acids such as mandelic acid or itaconic acid as catalyst in aqueous medium at room temperature. Mild reaction conditions, energy efficiency, good to excellent yields, environmentally benign conditions, easy isolation of products, no need of column chromatographic separation and the reusability of reaction media are some of the significant features of the present protocol.

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