Valorization of Waste: Sustainable Organocatalysts from Renewable Resources

Meninno, Sara

doi:10.1002/cssc.201902500

Cited by 37 publications

(41 citation statements)

References 168 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Consequently, the goals in the field of enantioselective organocatalysis are grouped around the development of (i) new catalysts that maintain their efficacy with lower catalysts loading, 2 (ii) efficient heterogeneous or immobilized organocatalysts that would allow for easy catalyst recovery after the reaction, 3 and (iii) more diverse ways to utilize the green and sustainable raw materials. 4 That said, the spotlight in any discipline remains universally focused on pushing the boundaries of what is possible and, in organic synthesis specifically, discovering new types of reactivity. Lewis base catalysis offers ample opportunity for such improvements, which can be illustrated with Lewis base catalyzed allylic substitutions.…”

Section: Introductionmentioning

confidence: 99%

Latent (Pro)Nucleophiles in Enantioselective Lewis Base Catalyzed Allylic Substitutions

Lange¹,

Zi²,

Vilotijević³

2020

Synlett

View full text Add to dashboard Cite

The use of latent nucleophiles, which are molecules that are not nucleophilic but can be activated to act as a nucleophile at an opportune time during the reaction, expands the scope of Lewis base catalyzed reactions. Here, we provide an overview of the concept and show examples of applications to N- and C-centered nucleophiles in allylic substitutions. N- and C-silyl compounds are superior latent (pro)nucleophiles in Lewis base catalyzed reactions with allylic fluorides in which the formation of the strong Si–F bond serves as the driving force for the reactions. The latent (pro)nucleophiles ensure high regioselectivity in these reactions and enable enantioselective transformations of Morita–Baylis–Hillman adducts by the use of common chiral Lewis base catalysts.1 Introduction2 Substitution of MBH Carbonates3 The Concept of Latent (Pro)Nucleophiles4 Enantioselective Allylation of N-Heterocycles5 Enantioselective Phosphonyldifluoromethylation of Allylic Fluorides6 Conclusion

show abstract

Section: Introductionmentioning

confidence: 99%

Latent (Pro)Nucleophiles in Enantioselective Lewis Base Catalyzed Allylic Substitutions

Lange¹,

Zi²,

Vilotijević³

2020

Synlett

View full text Add to dashboard Cite

show abstract

“…Chitosan is the partially deacetylated form of chitin. Chitosan with considerable -NH 2 groups, as a promising renewable solid base catalyst, emerged to promote the aldol condensation reaction, due to its water resistance and recyclability (Sakthivel and Dhakshinamoorthy et al, 2017;Rani et al, 2018;Meninno, 2020;Anbu et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Selective Utilization of N-acetyl Groups in Chitin for Transamidation of Amines

Shen

Liu

et al. 2021

Front. Chem. Eng.

View full text Add to dashboard Cite

The selective transformation of chitin into various renewable N-containing chemicals and medicines has attracted increasing attention. However, the N-acetyl groups in chitin construct strong hydrogen bond networks, which restricts its depolymerization and transformation. The selective conversion of robust chitin commonly requires considerable base catalysts to remove the N-acetyl group as a byproduct in advance, which is non-compliance with the principle of atomic economy. Herein, for the first time we demonstrate a novel approach to achieve the selective utilization of the N-acetyl group in chitin for transamidation of chitin with amines. A series of amine derivatives, mainly including aliphatic amine, cyclic amine and functionalized aromatic amine, could be selectively converted into the corresponding amide products frequently found in pharmaceuticals. Furthermore, the solid residue after removing the acetyl group (denoted as De-chitin) with the sufficient exposure of -NH2 groups as a solid base catalyst shows excellent performance in the aldol condensation reaction of furfural and acetone to produce fuel precursors. Our process provides a strategy that exploiting every functional group adequately in substrates to obtain value-added chemicals.

show abstract

“…Exploiting biomass is the true weapon to face this challenge, the true road for producing energy, ne chemicals and bio-based manufacts in a sustainable manner, thus de nitively eliminating the dependence on fossil sources, without loss of soil 1 . Important examples of biomass are wood and energy crops, such as for example soy, useful for producing biofuels but also bio-based chemicals and polymers 2 . Recent years have witnessed a rapid growth in the production of fuels 3 and materials entirely deriving from biomasses.…”

Section: Introductionmentioning

confidence: 99%

“…Recent years have witnessed a rapid growth in the production of fuels 3 and materials entirely deriving from biomasses. 4 However, this has led to many troubles such as improper exploitation of soils (non-food applications), increase of raw materials price (especially in Third World countries), biodiversity reduction, soil erosion and increased risk of insects and bacteria that destroy crops 1 . Biomass wastes can be the right solution to these problems 2 , constituting a widely available and no cost reservoir of carbohydrates, lipids and proteins, with possible on-site processing, coming from scraps of forests, yards, farms, or municipal waste foods, the proportion of which has been estimated at hundreds of megatonnes (Mt) per year around the world 5 .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Valorization of cigarette butts for top value-added chemicals: Levulinic Acid

Laurenza¹,

Losito

Casiello

et al. 2021

Preprint

View full text Add to dashboard Cite

Levulinic acid (LA), one of the top value-added intermediates of chemical industry, can be obtained by thermal hydrolysis (at 200 °C) from cigarette butts (as cellulose feedstock) catalysed by phosphoric acidic. The protocol avoids the use of more aggressive H2SO4 and HCl, that are generally employed on several cellulose sources (e.g. sludge paper), thus minimizing corrosion phenomena of plants. Neither chemical pre-treatment of butts nor specific purification procedure of LA are required. Notably, by simply modifying acid catalyst (e.g. using CH3COOH), another top value-added fine chemical such as 5-hydroxymethylfuraldehyde (HMF) is obtained, thus widening the scope of the method.Being cigarette filters a waste available in quantities of megatonnes per year, they represent an unlimited at no cost source of cellulose, thus enabling the up-scale to an industrial level of LA production.

show abstract

Valorization of Waste: Sustainable Organocatalysts from Renewable Resources

Cited by 37 publications

References 168 publications

Latent (Pro)Nucleophiles in Enantioselective Lewis Base Catalyzed Allylic Substitutions

Latent (Pro)Nucleophiles in Enantioselective Lewis Base Catalyzed Allylic Substitutions

Selective Utilization of N-acetyl Groups in Chitin for Transamidation of Amines

Valorization of cigarette butts for top value-added chemicals: Levulinic Acid

Contact Info

Product

Resources

About