Zr-KIT-6 catalyzed renewable synthesis of N-aryl pyrroles for producing bioactive synthetic compounds

Manal, Arjun K.; Srivastava, Rajendra

doi:10.1016/j.apcata.2022.119018

Cited by 7 publications

(1 citation statement)

References 42 publications

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“…S4 †). 35 The stretching vibration of -C-N overlapped with the asymmetric Si-O-Si vibrations. 33 When functionalized with organic groups such as SBA-15-Pr-MIM-OH, SBA-15-Pr-DMAP-OH, and SBA-15-Pr-DABCO-OH, these materials displayed peaks consistent with the parent SBA-15.…”

Section: Catalysts Characterizationmentioning

confidence: 98%

Solvent-free chemical upcycling of poly(bisphenol A carbonate) and poly(lactic acid) plastic waste using SBA-15-functionalized basic ionic liquids

Manal,

Saini,

Srivastava

2024

Green Chem.

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Section: Catalysts Characterizationmentioning

confidence: 98%

Solvent-free chemical upcycling of poly(bisphenol A carbonate) and poly(lactic acid) plastic waste using SBA-15-functionalized basic ionic liquids

Manal,

Saini,

Srivastava

2024

Green Chem.

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Recycling Valuable Phenol from Polycarbonate Plastic Waste Via Direct Depolymerization and Csp²−Csp³ Bond Cleavage Under Mild Conditions

Manal,

Rajendra Kanchan,

Banerjee

et al. 2024

ChemSusChem

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Upcycling plastic waste into commodity chemicals is recognized as an environmentally benign solution and beneficial for the sustained growth of humanity. Nevertheless, transition metal‐free catalysts and energy‐efficient conditions pose significant challenges due to the robust mechanical properties of plastics. Here, a strategy for selective production of phenol by upcycling polycarbonate waste via direct depolymerization and Csp2−Csp3 bond cleavage in an aqueous medium under mild conditions is reported. The commercial zeolites efficiently catalyze the depolymerization, Csp2−Csp3 bond hydrolysis, and direct Csp2−Csp3 bond scission at Cα of PC. Among all evaluated zeolites, HY (Si/Al=15) showed excellent catalytic performance, attributed to the ~75% yield of phenol and ~15% of acetone. The approach also employs different municipal waste PC for upcycling. Studies reveal that HY (15) exhibits high catalytic efficiency and phenol yield due to its optimum acid sites and textual properties. A scale‐up experiment demonstrated that 3.1 g of phenol was produced from 5.0 g of PC, and the mass balance was 90%. A combination of control experiments, NMR analysis, and DFT studies proposed the reaction pathway. Our findings present a sustainable avenue for upcycling PC waste and offer a new way to produce phenol, contributing to the advancement of a circular economy.

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Thermal Behaviour, Smoke Transfer and Antioxidant Analysis of Two Synthesised 2,5‐Dimethyl‐N‐Substituted Pyrrole Leucine Esters

Lai,

Li,

Yan

et al. 2024

Flavour & Fragrance J

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The limited availability of raw materials for cigarette aroma, particularly in emerging spices, highlights the need for proactive research in exploring and utilising new flavours. Pyrrole derivatives are an important class of five membered nitrogen‐containing heterocyclic compounds with beautiful aroma and excellent biological activity. By synthesising 2‐(2,5‐dimethyl‐1H‐pyrrol‐1‐yl)‐4‐methylpentanoic acid using the Paal–Knorr reaction followed by esterification reactions, novel pyrrole ester fragrances (5a and 5b) were obtained for further investigation. The two synthesised compounds were characterised using nuclear magnetic resonance spectroscopy (1H and 13C NMR), infrared spectroscopy (IR) and high‐resolution mass spectrometry (HRMS). Furthermore, the thermal properties, smoke transfer behaviour and antioxidant capacity of compounds 5a and 5b were evaluated. Thermogravimetric analysis (TG) revealed that compounds 5a and 5b exhibited major mass loss phases between 124.3°C–450°C and 116.8°C–450°C, respectively, with mass loss rates of 80.58% and 95.45%. Pyrolysis (Py) of compounds 5a and 5b resulted in the formation of eight and nine compounds, respectively. Moreover, the transfer rates of mainstream smoke particles from flavour additives 5a and 5b in tobacco shreds were higher compared with cigarette paper flavouring. Compound 5a demonstrated slightly higher antioxidant activity involving 2,2‐diphenyl‐1‐picrylhydrazyl (DPPH), hydroxyl radicals (•OH) and superoxide anion () than compound 5b. These findings support the development of new tobacco flavours and fragrance components and encourage further practical investigations.

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Zr-KIT-6 catalyzed renewable synthesis of N-aryl pyrroles for producing bioactive synthetic compounds

Cited by 7 publications

References 42 publications

Solvent-free chemical upcycling of poly(bisphenol A carbonate) and poly(lactic acid) plastic waste using SBA-15-functionalized basic ionic liquids

Solvent-free chemical upcycling of poly(bisphenol A carbonate) and poly(lactic acid) plastic waste using SBA-15-functionalized basic ionic liquids

Recycling Valuable Phenol from Polycarbonate Plastic Waste Via Direct Depolymerization and Csp²−Csp³ Bond Cleavage Under Mild Conditions

Thermal Behaviour, Smoke Transfer and Antioxidant Analysis of Two Synthesised 2,5‐Dimethyl‐N‐Substituted Pyrrole Leucine Esters

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Zr-KIT-6 catalyzed renewable synthesis of N-aryl pyrroles for producing bioactive synthetic compounds

Cited by 7 publications

References 42 publications

Solvent-free chemical upcycling of poly(bisphenol A carbonate) and poly(lactic acid) plastic waste using SBA-15-functionalized basic ionic liquids

Solvent-free chemical upcycling of poly(bisphenol A carbonate) and poly(lactic acid) plastic waste using SBA-15-functionalized basic ionic liquids

Recycling Valuable Phenol from Polycarbonate Plastic Waste Via Direct Depolymerization and Csp2−Csp3 Bond Cleavage Under Mild Conditions

Thermal Behaviour, Smoke Transfer and Antioxidant Analysis of Two Synthesised 2,5‐Dimethyl‐N‐Substituted Pyrrole Leucine Esters

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Recycling Valuable Phenol from Polycarbonate Plastic Waste Via Direct Depolymerization and Csp²−Csp³ Bond Cleavage Under Mild Conditions