Molybdenum-catalyzed oxidative depolymerization of alkali lignin: Selective production of Vanillin

Rawat, Shivam; Gupta, Prasoon; Singh, Baint; Bhaskar, Thallada; Natte, Kishore; Anand, N.

doi:10.1016/j.apcata.2020.117567

Cited by 51 publications

(27 citation statements)

References 65 publications

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“…Using different types of lignin, the group of Von Rohr and Gao managed to greatly affect lignin structure (e.g., lower M w ) and recover up to 17 wt% of low molecular weight aromatic compounds [25]. Recently, Rawat et al described the use of molybdenum pyrophosphate supported on cerium oxide (MoPO/CeO 2 ) for the oxidative lignin depolymerization in basic medium under mild conditions [26]. Lignin oxidative depolymerization has also been assessed in the presence of Co(Salen) complexes delivering up to 3 wt% of vanillin by Zhou and co-workers [27].…”

Section: Introductionmentioning

confidence: 99%

Supported-Metal Catalysts in Upgrading Lignin to Aromatics by Oxidative Depolymerization

et al. 2021

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Supported gold and platinum particles on titanium oxide catalysts were evaluated in the oxidative depolymerization of lignins toward high added value aromatics under mild conditions (T: 150 °C, Pair: 20 bar, CNaOH: 10 g/L, 1 h). Kraft and ethanol Organosolv lignins were engaged in the study. Gold catalyst showed a strong tendency to further oxidize aromatics produced from lignin depolymerization to volatile compounds leading to very low yield in target molecules. On the contrary, platinum-based catalysts were allowed to observe enhanced yields that were attributed to its ability to preserve lignin’s substructure during the reaction. A kinetic model was constructed based on the results observed, which allowed us to identify the occurrence of condensation reactions during lignin oxidation and degradation of the produced aromatic compounds as the main limitations to reach high product yields. Insights on lignin oxidation and the catalyst’s role lead through this study would help to reach higher control over lignin valorization.

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Section: Introductionmentioning

confidence: 99%

Supported-Metal Catalysts in Upgrading Lignin to Aromatics by Oxidative Depolymerization

et al. 2021

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“…Similarly, a heteroatom-containing 8-amino quinoline reacted smoothly with benzaldehyde and gave imine in 73% yield (Scheme 4, entry 36). Vanillin is one of the important product derived from lignin, 53 and its upgrading is very attractive to the area of sustainable chemistry. In this regard, a high yield of vanillinbased imine was obtained when vanillin was reacted with nitrobenzene (Scheme 4, entry 37).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Carbon-Supported Cobalt Nanoparticles as Catalysts for the Selective Hydrogenation of Nitroarenes to Arylamines and Pharmaceuticals

Goyal

Sarki

Singh

et al. 2020

ACS Appl. Nano Mater.

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Chemoselective hydrogenation of nitroarenes under industrially viable conditions is one of the attractive reaction for chemical, pharma, and pesticide industries. Herein, we report a reusable, stable, and renewable carbon-supported cobalt nanocatalyst (Co/MA-800) for the chemoselective reduction of structurally diverse nitroarenes with molecular hydrogen. The Co/MA-800 nanocatalyst was prepared via simple and straightforward carbonization of macroalgae and characterized by transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, H 2 -temperature programmed reduction, N 2 adsorption−desorption, and Raman spectroscopy. The cobalt content in Co/MA-800 is determined by inductively coupled plasma-atomic emission spectroscopy analysis. Furthermore, we show the hydrogenation of four marketed nitro pharmaceuticals that were selectively transformed to the respective primary anilines in excellent yields. We also demonstrate the synthesis of two industrially relevant key pharma intermediates on the ∼1 g scale, which are further employed in the preparation of drug compounds such as Linezolid and Tizanidine. The Co/MA-800 nanocatalyst was also active for the reductive amination of bezaldehyde and nitroarenes to achieve imines in good yields. In addition, the Co/MA-800 nanocatalyst is recycled 5 times without significant drop in catalytic activity.

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“…Guaiacol (2-metoxifenol) é um produto natural fenólico isolado a partir da oxidação da lignina, assim como Acetovanilona (RAWAT et al, 2020). Ambos detectados no papel antigo com concentrações de 0,75 e 0,50 mg g -1 , respectivamente.…”

Section: Marcadores De Papel Nos Cosvsunclassified

Avaliação Do Potencial De Adequação Da Síntese Do Cicloexeno Ao Contexto Da Química Verde

Golombieski¹,

Sandri²,

Magalhães³

2021

Química: Debate Entre a Vida Moderna E O Meio Ambiente

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Direitos para esta edição cedidos à Atena Editora pelos autores. Todo o conteúdo deste livro está licenciado sob uma Licença de Atribuição Creative Commons. Atribuição-Não-Comercial-NãoDerivativos 4.0 Internacional (CC BY-NC-ND 4.0).O conteúdo dos artigos e seus dados em sua forma, correção e confiabilidade são de responsabilidade exclusiva dos autores, inclusive não representam necessariamente a posição oficial da Atena Editora. Permitido o download da obra e o compartilhamento desde que sejam atribuídos créditos aos autores, mas sem a possibilidade de alterá-la de nenhuma forma ou utilizá-la para fins comerciais. Todos os manuscritos foram previamente submetidos à avaliação cega pelos pares, membros do Conselho Editorial desta Editora, tendo sido aprovados para a publicação com base em critérios de neutralidade e imparcialidade acadêmica.A Atena Editora é comprometida em garantir a integridade editorial em todas as etapas do processo de publicação, evitando plágio, dados ou resultados fraudulentos e impedindo que interesses financeiros comprometam os padrões éticos da publicação. Situações suspeitas de má conduta científica serão investigadas sob o mais alto padrão de rigor acadêmico e ético.

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Molybdenum-catalyzed oxidative depolymerization of alkali lignin: Selective production of Vanillin

Cited by 51 publications

References 65 publications

Supported-Metal Catalysts in Upgrading Lignin to Aromatics by Oxidative Depolymerization

Supported-Metal Catalysts in Upgrading Lignin to Aromatics by Oxidative Depolymerization

Carbon-Supported Cobalt Nanoparticles as Catalysts for the Selective Hydrogenation of Nitroarenes to Arylamines and Pharmaceuticals

Avaliação Do Potencial De Adequação Da Síntese Do Cicloexeno Ao Contexto Da Química Verde

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