Synthesis of 14-aryl-14<i>H</i>-dibenzo[<i>a,j</i>]xanthene Derivatives Catalysed by Expanded Graphite under Solvent-Free Condition

Li, Geng-Chen

doi:10.3184/030823408x340771

Cited by 10 publications

(5 citation statements)

References 32 publications

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“…Meanwhile, the increase of the solubility of carbon dioxide in solution also enhances the requisite supersaturation to nucleate of the intermediate basic cupric carbonate. The rate of nucleation is speeded up and this helps to receive much uniform and small basic cupric carbonate [12]. The subsequent decomposition of basic cupric carbonate consequently produces fine grained CuO clusters in nanometer size as well as even distribution on the surfaces of the molecular sieves.…”

Section: Advanced Materials Research Vols 284-286mentioning

confidence: 99%

A Novel Approach to Disperse CuO onto the Zeolites Mordenite and Beta

Hao

Zhang

Liu

et al. 2011

AMR

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Zeolites mordenite (MOR) and β decorated with high dispersion degree and loading content of CuO composite (symbolized as CuO/zeolite) were prepared via a novel method-the stepped hydrothermal synthesis. The resultant composite were characterized with details by powder XRD, ICP-AES, H2-TPR and TEM techniques. Shown by experiment, the stepped hydrothermal synthetic method adopted in the present research using urea as alkali source as well as benefiting from the ultrasonic wash treatment hardly damages the zeolitic framework structure. Compared with ammonia, high dispersion degree and loading level of CuO are yielded as a consequence of the employment of urea as alkali source. Besides, the ultrasonic wash treatment not only removes some CuO precursors that deposit on the external surface of the porous support but also produces a uniform distribution of CuO particles with smaller dimension on the surface of zeolites: CuO are dispersed in nanoscale of about 4-8 nm on mordenite and 2-5 nm on zeolite β. The present synthetic strategy could be therefore applied as a novel general method for the manufacture of functional materials in a wide spectrum.

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Section: Advanced Materials Research Vols 284-286mentioning

confidence: 99%

A Novel Approach to Disperse CuO onto the Zeolites Mordenite and Beta

Hao

Zhang

Liu

et al. 2011

AMR

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“…[ 1 ] Xanthenes, benzoxanthenes, coumarin, and fused coumarins are privileged categories of this class of compounds. [ 2,3 ] Xanthenes and benzoxanthenes were reported to exhibit an extensive range of biological and pharmaceutical properties, [ 4–6 ] including their use as cytotoxic agents [ 7 ] and as antagonists to inhibit zoxalamine activity. [ 8 ] They were also reported to have anti‐inflammatory, [ 9 ] antiviral, [ 10 ] and bactericidal activities.…”

Section: Introductionmentioning

confidence: 99%

Bis(aldehydes): Versatile precursors for novel bis(14H‐dibenzo[a,j]xanthenes), bis(pyrano[3,2‐c:5,6‐c']dichromenedione), and bis(dihydrobenzo[a]xanthenones) via multicomponent reactions

Darweesh

Salama

Abdelhamid

et al. 2020

Journal of Heterocyclic Chem

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A synthesis of novel bis(4‐(14H‐dibenzo[a,j]xanthenes) and bis(dihydro‐8H‐benzo[a]xanthenones) was performed in good yields via pseudo‐multicomponent, or multicomponent reactions, of bis‐aldehydes with four equivalents of β‐naphthol or with a mixture of two equivalents of each β‐naphthol and dimedone in the presence of a catalytic amount of p‐toluenesulfonic acid. Bis(pyrano[3,2‐c:5,6‐c′]dichromenediones) or tetrakis(4‐hydroxy‐2H‐chromen‐2‐ones) could also be obtained in good yields through pseudo‐multicomponent reactions of bis(aldehydes) with four molar ratio of 4‐hydroxycoumarin.

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“…In addition to a helpful review of literature in this publication, Singh and coworkers 1 developed an eco-friendly solventfree condensation method to obtain 14-aryl-or alkyl-14H-dibenzo [a, j] xanthenes using P2O5 or InCl3 as catalysts. For the synthesis of 14-aryl-14H-dibenzo [a, j] xanthene derivatives, Geng-Chen Li, has used aryl aldehydes, and freshly prepared expanded graphite as a catalyst 10 , while Hamid Reza Shaterian et al, reported the use of ferric hydrogen sulfate and aluminum hydrogen sulfate as catalysts 11,12 . Carbon tetra bromide (CBr4) 13 , and polyvinyl poly pyrrolidine-supported boron trifluoride (PVPP-BF3) 14 were the other important catalysts used for the synthesis of dibenzo xanthenes.…”

Section: Introductionmentioning

confidence: 99%

THIAMINE HYDROCHLORIDE AS EFFICIENT CATALYST FOR ONE-POT SYNTHESIS OF 14-ARYL -14H DIBENZO [a, j] XANTHENES UNDER GREENERY CONDITIONS

Kusampally¹,

Soma²,

Kamatala³

2019

RJC

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Thiamine hydrochloride (THC) is a biodegradable, readily available and inexpensive eco-friendly metal free biocatalyst, which is efficiently used in the condensation of 2-naphthol and aromatic aldehydes under thermal and microwave conditions without using toxic solvents. Developed methods herein afforded 14-aryl 14H-dibenzo [a, j] xanthenes in very good yields and offered several advantages such as shorter reaction time, comparable yield, neat practice, easy work-up and mild organo Lewis acid catalyst.

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Synthesis of 14-aryl-14H-dibenzo[a,j]xanthene Derivatives Catalysed by Expanded Graphite under Solvent-Free Condition

Cited by 10 publications

References 32 publications

A Novel Approach to Disperse CuO onto the Zeolites Mordenite and Beta

A Novel Approach to Disperse CuO onto the Zeolites Mordenite and Beta

Bis(aldehydes): Versatile precursors for novel bis(14H‐dibenzo[a,j]xanthenes), bis(pyrano[3,2‐c:5,6‐c']dichromenedione), and bis(dihydrobenzo[a]xanthenones) via multicomponent reactions

THIAMINE HYDROCHLORIDE AS EFFICIENT CATALYST FOR ONE-POT SYNTHESIS OF 14-ARYL -14H DIBENZO [a, j] XANTHENES UNDER GREENERY CONDITIONS

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