Author′s reply

Kundu, Zile Singh; Gupta, Vinay; Sangwan, Sukhbir Singh; Rana, Parveen

doi:10.4103/0019-5413.121611

Cited by 3 publications

(4 citation statements)

References 3 publications

(4 reference statements)

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“…The reaction of ninhydrin and phenol derivatives has been reported previously (Scheme 1) and it has been shown that these adducts primarily exist in the intramolecular hemiketal form 3 with cis geometry of the vicinal OH groups [9,10]. This structure has been also supported by the reported X-ray studies [11].…”

Section: Introductionsupporting

confidence: 57%

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Synthesis of New Functionalized Heterocyclic [4,3,3] Propellanes via Three‐component Reaction Based on Ninhydrin–Phenol Adducts

Sirouspour

Souri

2015

Journal of Heterocyclic Chem

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Three‐component reaction between ninhydrin–phenol adducts, dialkyl acetylenedicarboxylates, and triphenylphosphine was investigated. Utilizing this protocol, dialkyl 10‐oxo‐10H‐4b,9b‐(epoxyethanooxy)indeno[1,2‐b]benzofuran‐12,13‐dicarboxylates as functionalized heterocyclic [4,3,3] propellanes was synthesized in 6‐endo‐trig cyclization mode. 8‐hydroxyquinoline showed serendipitous reactivity and produced para substituted adduct in the reaction with ninhydrin in acetic acid media and hence produced dialkyl 8a‐(4‐(alkoxycarbonyl)‐2‐oxo‐2H‐pyrano[3,2‐h]quinolin‐6‐yl)‐8‐oxo‐8,8a‐dihydro‐2H‐indeno[2,1‐b]furan‐2,3‐dicarboxylate in the reaction with dialkyl acetylenedicarboxylates and PPh3.

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Section: Introductionsupporting

confidence: 57%

“…Commercially available materials were used without further purification. Ninhydrin-phenol adduct was synthesized according to the reported method [11]. Melting points were measured on an Electrothermal 9100 apparatus (Bibby Scientific, Staffordshire, United Kingdom).…”

Section: Methodsmentioning

confidence: 99%

Synthesis of New Functionalized Heterocyclic [4,3,3] Propellanes via Three‐component Reaction Based on Ninhydrin–Phenol Adducts

Sirouspour

Souri

2015

Journal of Heterocyclic Chem

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“…This experimental model in its preparation presumes that the adsorption is monolayer (the adsorbed layer is only a single molecule thick) and can occur explicitly at a finite (fixed) number of specific localized sites without any lateral interaction and steric hindrance among the adsorbed molecules, even on head‐to‐head sites, and are alike and correspondent . Homogeneous adsorption in which every molecule has constant enthalpy and sorption activation energy (all sites possess equal affinity for the adsorbate) is basically represented by the Langmuir isotherm in its derivation with absolutely no travelling of the adsorbate in the plane of the surface …”

Section: Adsorption Isothermsmentioning

confidence: 99%

Chitosan adsorbents for dye removal: a review

2017

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One of the most important decontamination techniques is considered to be adsorption. It is fast, simple, low cost with many opportunities to modify the initial materials after appropriate synthesis routes etc. Numerous adsorbent materials have been prepared in the last few years having as the ultimate scope to remove some pollutants especially from contaminated waters (effluents originating from industry). But the composition of each type of effluent varies. Dyes are some major components of industrial wastewaters. Chitosan (poly--(1 → 4)-2-amino-2-deoxy-D-glucose) is a nitrogenous (amino-based) polysaccharide which is produced in large quantities by N-deacetylation of (its source compound) chitin. The major advantage of chitosan is the existence of modifiable positions in its chemical structure. Modification of the chitosan molecule by (i) grafting (inserting functional groups) or (ii) crosslinking reactions (uniting the macromolecular chains with each other) leads to the formation of chitosan derivatives with superior properties (enhancement of adsorption capacity and resistance in extreme medium conditions, respectively). This review summarizes the important contribution of chitosan derivatives to the dye removal process by adsorption.

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“…Owing to their versatile biological and medicinal activities as well as their prevalence in natural resources, syntheses of BIMs have continued to be of intense interest. In general, the condensation of indoles and carbonyl compounds catalyzed by Lewis acids, heteropoly acids, solid acids, ionic liquids, metal complexes or biocatalysts is the most traditional and practical method for the synthesis of BIMs. Even though these protocols have demonstrated their efficiency in the synthesis of BIMs, they also suffer from limitations such as long reaction times, the use of expensive or toxic metal ions, the difficulty of recovering high‐boiling solvents, high temperatures, the need for special efforts for the preparation of catalysts as well as harsh conditions.…”

Section: Optimization Of Reaction Condition[a]mentioning

confidence: 99%

Catalyst Free Synthesis of Bis(Indolyl)Methanes and 3,3‐Bis(Indolyl)oxindoles in Aqueous Ethyl Lactate

2017

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A highly efficient and environmentally friendly approach has been reported for the synthesis of bis(indolyl)methanes and 3,3‐bis(indolyl)oxindoles by reacting of indoles with aldehydes or isatins in water‐ethyl lactate under ultrasound irradiation. This protocol presents the benefits of catalyst‐free, operational simplicity, short reaction time, high product yield, broad substrate scope and applicability for large‐scale synthesis.

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Author′s reply

Cited by 3 publications

References 3 publications

Synthesis of New Functionalized Heterocyclic [4,3,3] Propellanes via Three‐component Reaction Based on Ninhydrin–Phenol Adducts

Synthesis of New Functionalized Heterocyclic [4,3,3] Propellanes via Three‐component Reaction Based on Ninhydrin–Phenol Adducts

Chitosan adsorbents for dye removal: a review

Catalyst Free Synthesis of Bis(Indolyl)Methanes and 3,3‐Bis(Indolyl)oxindoles in Aqueous Ethyl Lactate

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