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Itoh Toshiyuki - One of the best experts on this subject based on the ideXlab platform.
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Direct Extraction of Polysaccharides from Moso Bamboo (Phylostachys heterocycla) Chips Using a Mixed Solvent System of an Amino Acid Ionic Liquid with Polar Aprotic Solvent
'The Chemical Society of Japan', 2020Co-Authors: Dong Yue, Takeshita Tokio, Miyafuji Hisashi, Nokami Toshiki, Itoh ToshiyukiAbstract:The cellulose-dissolving ability and some physical properties of mixed Solvents of an amino acid IL, N-methyl-N-(2-methoxyethyl)pyrolidin-1-ium 2,6-diaminohexanoate ([P1ME][Lys]), with Polar Aprotic Solvents, such as 1,3-dimethylimidazolidinone (DMI), N,N-dimethylformamide (DMF), dimethylsulfoxide (DMSO), and acetonitrile (CH3CN), have been investigated. The viscosity was significantly reduced by the increasing content of Polar Aprotic Solvents, and a 1:1 mixture (molar ratio) of [P1ME][Lys] with DMF showed 91.5 cP which corresponded to less than 1/10 compared to that of the pure IL at 25 °C (1058 cP). The β values of the mixed Solvents, which have the IL contents over 0.1, exhibited β-values similar to that of the pure IL. On the other hand, the π-value was dependent on the ratio of the IL content, and the pure IL had the highest π-value. We found that the mixed Solvent of [P1ME][Lys] with DMF (1:1) easily dissolved the cellulose and the mixed Solvent could be used to extract cellulose from moso bamboo (Phylostachys heterocycla) powder. The efficiency of the extraction of cellulose from the bamboo powder was significantly increased when a 1:1 mixture of the IL with a Polar Aprotic Solvent was used as the extracting Solvent at 60 °C; the extraction ratio of the 1:1 mixture (IL: DMF) reached twice that of the pure IL. We thus obtained cellulose in 18% (w/w) yield from the bamboo powder
Toshiyuki Itoh - One of the best experts on this subject based on the ideXlab platform.
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direct extraction of polysaccharides from moso bamboo phylostachys heterocycla chips using a mixed Solvent system of an amino acid ionic liquid with Polar Aprotic Solvent
Bulletin of the Chemical Society of Japan, 2017Co-Authors: Yue Dong, Tokio Takeshita, Hisashi Miyafuji, Toshiki Nokami, Toshiyuki ItohAbstract:The cellulose-dissolving ability and some physical properties of mixed Solvents of an amino acid IL, N-methyl-N-(2-methoxyethyl)pyrolidin-1-ium 2,6-diaminohexanoate ([P1ME][Lys]), with Polar aproti...
Dong Yue - One of the best experts on this subject based on the ideXlab platform.
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Direct Extraction of Polysaccharides from Moso Bamboo (Phylostachys heterocycla) Chips Using a Mixed Solvent System of an Amino Acid Ionic Liquid with Polar Aprotic Solvent
'The Chemical Society of Japan', 2020Co-Authors: Dong Yue, Takeshita Tokio, Miyafuji Hisashi, Nokami Toshiki, Itoh ToshiyukiAbstract:The cellulose-dissolving ability and some physical properties of mixed Solvents of an amino acid IL, N-methyl-N-(2-methoxyethyl)pyrolidin-1-ium 2,6-diaminohexanoate ([P1ME][Lys]), with Polar Aprotic Solvents, such as 1,3-dimethylimidazolidinone (DMI), N,N-dimethylformamide (DMF), dimethylsulfoxide (DMSO), and acetonitrile (CH3CN), have been investigated. The viscosity was significantly reduced by the increasing content of Polar Aprotic Solvents, and a 1:1 mixture (molar ratio) of [P1ME][Lys] with DMF showed 91.5 cP which corresponded to less than 1/10 compared to that of the pure IL at 25 °C (1058 cP). The β values of the mixed Solvents, which have the IL contents over 0.1, exhibited β-values similar to that of the pure IL. On the other hand, the π-value was dependent on the ratio of the IL content, and the pure IL had the highest π-value. We found that the mixed Solvent of [P1ME][Lys] with DMF (1:1) easily dissolved the cellulose and the mixed Solvent could be used to extract cellulose from moso bamboo (Phylostachys heterocycla) powder. The efficiency of the extraction of cellulose from the bamboo powder was significantly increased when a 1:1 mixture of the IL with a Polar Aprotic Solvent was used as the extracting Solvent at 60 °C; the extraction ratio of the 1:1 mixture (IL: DMF) reached twice that of the pure IL. We thus obtained cellulose in 18% (w/w) yield from the bamboo powder
Yue Dong - One of the best experts on this subject based on the ideXlab platform.
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direct extraction of polysaccharides from moso bamboo phylostachys heterocycla chips using a mixed Solvent system of an amino acid ionic liquid with Polar Aprotic Solvent
Bulletin of the Chemical Society of Japan, 2017Co-Authors: Yue Dong, Tokio Takeshita, Hisashi Miyafuji, Toshiki Nokami, Toshiyuki ItohAbstract:The cellulose-dissolving ability and some physical properties of mixed Solvents of an amino acid IL, N-methyl-N-(2-methoxyethyl)pyrolidin-1-ium 2,6-diaminohexanoate ([P1ME][Lys]), with Polar aproti...
Ibitola A Babatunde - One of the best experts on this subject based on the ideXlab platform.
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rationalization of the effects of hydrogen bond donor Solvent and nucleofugicity of fluoride ion on nucleophilic aromatic substitution reactions in non Polar Aprotic Solvent reaction of 2 4 dinitrofluorobenzene with cyclohexylamine in toluene and tol
Journal Of Chemical Society Of Nigeria, 2021Co-Authors: A D Adesina, Ibitola A BabatundeAbstract:The kinetics of the reaction of 2,4-dinitrofluorobenzene with cyclohexylamine were studied at different concentrations in toluene and toluene-alkanol mixtures. The reaction was not base-catalysed in toluene. Addition of small amounts of hydrogen-bond donor Solvent, alkanol (ranging from methanol to hexanol) to the toluene medium of the reactions produced a different effect in comparison to uncatalysed reactions — slight increase in rate of reaction. The results are rationalized in terms of the effect of amine-Solvent interaction on the nucleophilicity of the amine in addition to some other factors operating through cyclic transition states leading to products. It is also attributed to the peculiar nature of fluoride ion as a leaving group.
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catalytic effects of hydrogen bond acceptor Solvent on nucleophilic aromatic substitution reactions in non Polar Aprotic Solvent reactions of phenyl 2 4 6 trinitrophenyl ether with amines in benzene acetonitrile mixtures
Tetrahedron, 2005Co-Authors: Olayinka Banjoko, Ibitola A BabatundeAbstract:Abstract The effect of addition of small amounts of hydrogen-bond acceptor Solvent, acetonitrile, to the benzene medium of the reactions of phenyl 2,4,6-trinitrophenyl ether with aniline and cyclohexylamine, respectively have been investigated. The addition produced similar effects in the two reactions—continuous rate increase with increasing amounts of acetonitrile. The results are interpreted in terms of the effect of amine–Solvent interaction on the nucleophilicity of the amines and are in accord with our expectations based on the effects observed for hydrogen-bond donor Solvent, methanol on the same reactions. It is also established from the results that the role of hydrogen-bond acceptor co-Solvent could be played by an added more basic non-nucleophilic amine.
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rationalization of the conflicting effects of hydrogen bond donor Solvent on nucleophilic aromatic substitution reactions in non Polar Aprotic Solvent reactions of phenyl 2 4 6 trinitrophenyl ether with primary and secondary amines in benzene methano
Tetrahedron, 2004Co-Authors: Olayinka Banjoko, Ibitola A BabatundeAbstract:Abstract The kinetics of the reactions of phenyl 2,4,6-trinitrophenyl ether with piperidine and cyclohexylamine respectively were studied at different amine concentrations in benzene. The reaction of cyclohexylamine was not base-catalysed while that of piperidine was catalysed by one molecule of the nucleophilic amine. Addition of small amounts of hydrogen-bond donor Solvent, methanol to the benzene medium of the reactions produced different effects—rate diminution followed by rate increase in one and continuous rate diminution in the other. These effects are compared with that of aniline (previously studied) in which a continuous rate increase was observed. The results are rationalized in terms of the effect of amine-Solvent interaction on the nucleophilicity of the amines in addition to some other factors operating through cyclic transition states leading to products. It is evident from the rationalization that the idea of ‘dimer nucleophile’ in nucleophilic aromatic substitution reactions is erroneous.