Chitosan as an eco-friendly solid base catalyst for the solvent-free synthesis of jasminaldehyde

Sudheesh, N.; Sharma, Sumeet K.; Shukla, Ram S.

doi:10.1016/j.molcata.2010.02.005

Cited by 73 publications

(38 citation statements)

References 17 publications

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“…More recently, with the development of environmentally friendly industries, CS-supported metals catalysts have attracted a lot of attention because CS shows these advantages of nontoxicity and desirable physical and mechanical properties [10][11][12][13]. In previous papers [14][15][16][17][18], a silica-supported CS-palladium complex abbreviated as SiO-CS-Pd has been found to catalyze the hydrogenation of nitrotoluene, nitrobenzene, chlorophenol, 2-octene and 3-octene, et al Some ketones can reduce to chiral alcohols catalyzed by silica supported CS-Pd complex via asymmetric hydrogenation [19,20].…”

Section: Introductionmentioning

confidence: 99%

Efficient and Clean Catalytic Hydrogenolysis of Aromatic Ketones by Silica Supported Schiff Base Modify Chitosan-Palladium Catalyst

Gu¹,

Liu²,

Zhao³

2013

MRC

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An silica supported chitosan-Schiff base Pd(II) catalyst was prepared in a simple way and characterized by XRD, FT-IR, SEM-EDS, XPS and TG, and the ability of this complex to catalyze hydrogenolysis of 1-tetralone into 1,2,3,4-tetrahydronaphthalene was also investigated in the presence of hydrogen. It has been revealed that the catalyst had high catalytic activity for hydrogenolysis of 1-tetralone at ambient temperature and normal pressure of hydrogen. Especially, the hydrogenolysis of 1-tetralone in ethanol solvent gave excellent results and the 100% conversion of 1-tetralone and the 100% selectivity for 1,2,3,4-tetrahydronaphthalene were obtained under optimized reaction conditions. The influences of reaction temperature, reaction time and solvent on the hydrogenolysis of 1-tetralone were also investigated. It has been also revealed that the catalyst was efficient and eco-friendly for the hydrogenolysis of carbonyl that connected with a benzene ring to give corresponding aromatic hydrocarbons.

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Section: Introductionmentioning

confidence: 99%

Efficient and Clean Catalytic Hydrogenolysis of Aromatic Ketones by Silica Supported Schiff Base Modify Chitosan-Palladium Catalyst

Gu¹,

Liu²,

Zhao³

2013

MRC

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“…Moreover, two additional peaks appear at 1500 cm -1 and 660 cm -1 . The peak at 1500 cm -1 is attributed to -NH 3 + , whose adsorption is affected by forming ionic bridges with SO 4 2-, while the peak at 660 cm -1 probably corresponds to SO 4 2-. This result indicates that the sulfonation reaction in CHS and CSSR of TCLD = 20 % mainly occurs at the C 2 amino groups.…”

Section: F I G 1 -Crosslinking Reaction Of Chitosan With Glutaraldementioning

confidence: 98%

“…20,21 Consequently, the sulfonation reaction of CCR mainly occurs at the C 2 amino groups and C 6 primary hydroxyl groups. The sulfonation of the C 2 amino groups by concentrated H 2 SO 4 solutions occurs in two steps: the amino groups of chitosan are firstly protonated by H 2 SO 4 ; then a SO 4 2-anion interacts with two NH 3 + groups to form ionic bridges between them. 21,22 Therefore, the sulfonation at the C 2 amino groups can also realize the crosslinking of chitosan.…”

Section: Synthesis Mechanism Of Sccrmentioning

confidence: 99%

“…Valentin et al 3 showed that chitosan microspheres, obtained under supercritical CO 2 conditions, could be used as a catalyst for the synthesis of monoglyceride from fatty acid and glycidol. Sudheesh et al 4 prepared chitosan hydrogel as solid base catalysts for jasminaldehyde synthesis by the condensation of 1-heptanal with benzaldehyde under solvent-free conditions. Reddy et al 5 demonstrated that chitosan hydrogel is an efficient organocatalyst for aldol and knoevenagel reactions.…”

Section: Introductionmentioning

confidence: 99%

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A Novel Solid-acid Catalyst Using Sulfonated Crosslinked Chitosan Resin

Tang

et al. 2016

Chem.Biochem.Eng.Q.

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Sulfonated crosslinked chitosan resins (SCCRs) were prepared by firstly crosslinking chitosan to crosslinked chitosan resins (CCRs) using a reverse emulsion crosslinking method, followed by sulfonating CCRs with concentrated H 2 SO 4 as the sulfonation agent. The properties and application of SCCRs as solid acid catalysts were studied. The acidic sites in SCCRs, including C 6 -O and C 2 -N sulfate groups, are all weak acidic sites. SCCRs of higher crosslinking degrees have a higher sulfonation rate of the C 6 primary hydroxyl groups, thus more C 6 -O sulfate groups. High-temperature treatment and TG analysis verified that the crosslinking can improve the thermostability of both SCCR backbone and its acidic groups, and a higher crosslinking degree leads to better thermostability. Catalytic esterification of citric acid with butanol and propionic acid with n-butyl alcohol demonstrated that SCCRs have good catalytic activity and can be repetitively used as efficient solid acid catalysts.

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“…For instances, chitosan was extensively investigated in metal extraction [2][3][4], chemical synthesis reaction [5,6] and electrolyte-based fuel cells studies [7,8]. Chitosan was explored to be a mild and direct solid catalyst in organic synthesis without any post-modification [6,9,10]. However, most of the research efforts have been reported to prepare functional derivatives of chitosan…”

Section: Introductionmentioning

confidence: 99%

Chitosan as a Natural Polymer for Heterogeneous Catalysts Support: A Short Review on Its Applications

2015

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Chitosan, a bio-based polymer which has similar characteristics to those of cellulose, exhibits cationic behavior in acidic solutions and strong affinity for metals ions. Thus, it has received increased attention for the preparation of heterogeneous catalysts. Recent studies demonstrated that chitosan-based catalysts had high sorption capacities, chelating activities, stability and versatility, which could be potentially applied as green reactants in various scientific and engineering applications. This study intends to review the recent development of chitosan-based catalysts, particularly in the aspects of the main mechanisms for preparing the materials and their applications in environmental green chemistry. Studies on the preparation of catalyst nanoparticles/nanospheres supported on chitosan were also reviewed.

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Chitosan as an eco-friendly solid base catalyst for the solvent-free synthesis of jasminaldehyde

Cited by 73 publications

References 17 publications

Efficient and Clean Catalytic Hydrogenolysis of Aromatic Ketones by Silica Supported Schiff Base Modify Chitosan-Palladium Catalyst

Efficient and Clean Catalytic Hydrogenolysis of Aromatic Ketones by Silica Supported Schiff Base Modify Chitosan-Palladium Catalyst

A Novel Solid-acid Catalyst Using Sulfonated Crosslinked Chitosan Resin

Chitosan as a Natural Polymer for Heterogeneous Catalysts Support: A Short Review on Its Applications

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