The Experts below are selected from a list of 282 Experts worldwide ranked by ideXlab platform
Carl Braybrook - One of the best experts on this subject based on the ideXlab platform.
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novel synthesis of symmetrical 3 3 allyl dithioethers as photoplastic monomer precursors by equal Molar Rate addition of reactants and solvent controlled oligomerization
ChemInform, 2013Co-Authors: Cornelis Matthijs Moorhoff, Wayne D. Cook, Carl BraybrookAbstract:An alternative method is described for the synthesis of title compounds which can be used as monomers in photoplastic polymers.
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Novel Synthesis of Symmetrical 3,3′-Allyl Dithioethers as Photoplastic Monomer Precursors by Equal Molar Rate Addition of Reactants and Solvent Controlled Oligomerization.
ChemInform, 2013Co-Authors: Cornelis Matthijs Moorhoff, Wayne D. Cook, Carl BraybrookAbstract:An alternative method is described for the synthesis of title compounds which can be used as monomers in photoplastic polymers.
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Novel synthesis of symmetrical 3,3′-allyl dithioethers as photoplastic monomer precursors by equal Molar Rate addition of reactants and solvent controlled oligomerization
Monatshefte für Chemie - Chemical Monthly, 2013Co-Authors: Cornelis Matthijs Moorhoff, Wayne D. Cook, Carl BraybrookAbstract:An alternative method has been developed whereby novel 3,3 0 -allyl dithioethers, for monomers used in photoplastic polymers, have been synthesized from a syn- chronized, rapid addition of a concentRated mixture of 2 mol equiv alkyl halide and 1 mol equiv 3-mercapto-2- mercaptomethyl-1-propene (A) in MeOH in one syringe and an equi-volume two mol equivalent sodium methoxide in MeOH in another syringe. Thus, two-fold excess 3-chloro-2- chloromethyl-1-propene (B) with A gave B-A-B and B-A-B- A-B as the main products but no B-A or B-A-B-A due to the mechanism involved and the low solubility of the longer oligomer in MeOH. When the reaction of 2 9 A with B was carried out, the main product was A-B-A-B-A-B-A.
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novel synthesis of symmetrical 3 3 allyl dithioethers as photoplastic monomer precursors by equal Molar Rate addition of reactants and solvent controlled oligomerization
Monatshefte Fur Chemie, 2013Co-Authors: Cornelis Matthijs Moorhoff, Wayne D. Cook, Carl BraybrookAbstract:An alternative method has been developed whereby novel 3,3 0 -allyl dithioethers, for monomers used in photoplastic polymers, have been synthesized from a syn- chronized, rapid addition of a concentRated mixture of 2 mol equiv alkyl halide and 1 mol equiv 3-mercapto-2- mercaptomethyl-1-propene (A) in MeOH in one syringe and an equi-volume two mol equivalent sodium methoxide in MeOH in another syringe. Thus, two-fold excess 3-chloro-2- chloromethyl-1-propene (B) with A gave B-A-B and B-A-B- A-B as the main products but no B-A or B-A-B-A due to the mechanism involved and the low solubility of the longer oligomer in MeOH. When the reaction of 2 9 A with B was carried out, the main product was A-B-A-B-A-B-A.
Vitor J P Vilar - One of the best experts on this subject based on the ideXlab platform.
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Removal of bromate from drinking water using a heterogeneous photocatalytic mili-reactor: impact of the reactor material and water matrix
Environmental Science and Pollution Research, 2019Co-Authors: Gustavo S. Cunha, Sara G. S. Santos, Bianca M. Souza-chaves, Márcia W.c. Dezotti, José Carlos B. Lopes, Madalena M Dias, Rui A.r. Boaventura, Tânia F C V Silva, João Paulo Bassin, Vitor J P VilarAbstract:The main goal of this study was to evaluate the removal of bromate from drinking water using a heterogeneous photocatalytic mili-photoreactor, based on NETmix technology. The NETmix mili-reactor consists of a network of channels and chambers imprinted in a back slab made of acrylic (AS) or stainless steel (SSS) sealed, through mechanical compression and o-rings, with an UVA-transparent front borosilicate glass slab (BGS). A plate of UVA-LEDs was placed above the BGS window. TiO2-P25 thin films were immobilized on the BGS (back-side illumination, BSI) or SSS (front-side illumination, FSI) by using a spray deposition method. The photoreduction Rate of a 200 μg L−1 (1.56 μM) BrO3− solution was assessed taking into account the following: (i) catalyst film thickness, (ii) catalyst coated surface and illumination mechanism (BSI or FSI), (iii) solution pH, (iv) type and dose of sacrificial agent (SA), (v) reactor material, and (vi) water matrix. In acidic conditions (pH 3.0) and in the absence of light/catalyst/SA, 28% and 36% of BrO3− was reduced into Br− only by contacting with AS and SSS during 2-h, respectively. This effect prevailed during BSI experiments, but not for FSI ones since back SSS was coated with the photocatalyst. The results obtained have demonstRated that (i) the Molar Rate of disappearance of bromates was similar to the Molar Rate of formation of bromides; (ii) higher BrO3− reduction efficiencies were reached in the presence of an SA using the FSI at pH 3.0; (iii) formic acid ([BrO3−]:[CH2O2] Molar ratio of 1:3) presented higher performance than humic acids (HA = 1 mg C L−1) as SA; (iv) high amounts of HA impaired the BrO3− photoreduction reaction; (v) SSS coated catalyst surface revealed to be stable for at least 4 consecutive cycles, keeping its photonic efficiency. Under the best operating conditions (FSI, 18 mL of 2% wt. TiO2-P25 suspension, pH 3.0), the use of freshwater matrices led to (i) equal or higher reaction Rates, when compared with a synthetic water in the absence of SA, and (ii) lower reaction Rates, when compared with a synthetic water containing formic acid with a [BrO3−]:[CH2O2] Molar ratio of 1:3. Notwithstanding, heterogeneous TiO2 photocatalysis, using the NETmix mili-reactor can be used to promote the reduction of BrO3− into Br−, attaining concentrations below 10 μg L−1 (guideline value) after 2-h reaction. Graphical Abstract.
Cornelis Matthijs Moorhoff - One of the best experts on this subject based on the ideXlab platform.
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novel synthesis of symmetrical 3 3 allyl dithioethers as photoplastic monomer precursors by equal Molar Rate addition of reactants and solvent controlled oligomerization
ChemInform, 2013Co-Authors: Cornelis Matthijs Moorhoff, Wayne D. Cook, Carl BraybrookAbstract:An alternative method is described for the synthesis of title compounds which can be used as monomers in photoplastic polymers.
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Novel Synthesis of Symmetrical 3,3′-Allyl Dithioethers as Photoplastic Monomer Precursors by Equal Molar Rate Addition of Reactants and Solvent Controlled Oligomerization.
ChemInform, 2013Co-Authors: Cornelis Matthijs Moorhoff, Wayne D. Cook, Carl BraybrookAbstract:An alternative method is described for the synthesis of title compounds which can be used as monomers in photoplastic polymers.
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Novel synthesis of symmetrical 3,3′-allyl dithioethers as photoplastic monomer precursors by equal Molar Rate addition of reactants and solvent controlled oligomerization
Monatshefte für Chemie - Chemical Monthly, 2013Co-Authors: Cornelis Matthijs Moorhoff, Wayne D. Cook, Carl BraybrookAbstract:An alternative method has been developed whereby novel 3,3 0 -allyl dithioethers, for monomers used in photoplastic polymers, have been synthesized from a syn- chronized, rapid addition of a concentRated mixture of 2 mol equiv alkyl halide and 1 mol equiv 3-mercapto-2- mercaptomethyl-1-propene (A) in MeOH in one syringe and an equi-volume two mol equivalent sodium methoxide in MeOH in another syringe. Thus, two-fold excess 3-chloro-2- chloromethyl-1-propene (B) with A gave B-A-B and B-A-B- A-B as the main products but no B-A or B-A-B-A due to the mechanism involved and the low solubility of the longer oligomer in MeOH. When the reaction of 2 9 A with B was carried out, the main product was A-B-A-B-A-B-A.
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novel synthesis of symmetrical 3 3 allyl dithioethers as photoplastic monomer precursors by equal Molar Rate addition of reactants and solvent controlled oligomerization
Monatshefte Fur Chemie, 2013Co-Authors: Cornelis Matthijs Moorhoff, Wayne D. Cook, Carl BraybrookAbstract:An alternative method has been developed whereby novel 3,3 0 -allyl dithioethers, for monomers used in photoplastic polymers, have been synthesized from a syn- chronized, rapid addition of a concentRated mixture of 2 mol equiv alkyl halide and 1 mol equiv 3-mercapto-2- mercaptomethyl-1-propene (A) in MeOH in one syringe and an equi-volume two mol equivalent sodium methoxide in MeOH in another syringe. Thus, two-fold excess 3-chloro-2- chloromethyl-1-propene (B) with A gave B-A-B and B-A-B- A-B as the main products but no B-A or B-A-B-A due to the mechanism involved and the low solubility of the longer oligomer in MeOH. When the reaction of 2 9 A with B was carried out, the main product was A-B-A-B-A-B-A.
Wayne D. Cook - One of the best experts on this subject based on the ideXlab platform.
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novel synthesis of symmetrical 3 3 allyl dithioethers as photoplastic monomer precursors by equal Molar Rate addition of reactants and solvent controlled oligomerization
ChemInform, 2013Co-Authors: Cornelis Matthijs Moorhoff, Wayne D. Cook, Carl BraybrookAbstract:An alternative method is described for the synthesis of title compounds which can be used as monomers in photoplastic polymers.
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Novel Synthesis of Symmetrical 3,3′-Allyl Dithioethers as Photoplastic Monomer Precursors by Equal Molar Rate Addition of Reactants and Solvent Controlled Oligomerization.
ChemInform, 2013Co-Authors: Cornelis Matthijs Moorhoff, Wayne D. Cook, Carl BraybrookAbstract:An alternative method is described for the synthesis of title compounds which can be used as monomers in photoplastic polymers.
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Novel synthesis of symmetrical 3,3′-allyl dithioethers as photoplastic monomer precursors by equal Molar Rate addition of reactants and solvent controlled oligomerization
Monatshefte für Chemie - Chemical Monthly, 2013Co-Authors: Cornelis Matthijs Moorhoff, Wayne D. Cook, Carl BraybrookAbstract:An alternative method has been developed whereby novel 3,3 0 -allyl dithioethers, for monomers used in photoplastic polymers, have been synthesized from a syn- chronized, rapid addition of a concentRated mixture of 2 mol equiv alkyl halide and 1 mol equiv 3-mercapto-2- mercaptomethyl-1-propene (A) in MeOH in one syringe and an equi-volume two mol equivalent sodium methoxide in MeOH in another syringe. Thus, two-fold excess 3-chloro-2- chloromethyl-1-propene (B) with A gave B-A-B and B-A-B- A-B as the main products but no B-A or B-A-B-A due to the mechanism involved and the low solubility of the longer oligomer in MeOH. When the reaction of 2 9 A with B was carried out, the main product was A-B-A-B-A-B-A.
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novel synthesis of symmetrical 3 3 allyl dithioethers as photoplastic monomer precursors by equal Molar Rate addition of reactants and solvent controlled oligomerization
Monatshefte Fur Chemie, 2013Co-Authors: Cornelis Matthijs Moorhoff, Wayne D. Cook, Carl BraybrookAbstract:An alternative method has been developed whereby novel 3,3 0 -allyl dithioethers, for monomers used in photoplastic polymers, have been synthesized from a syn- chronized, rapid addition of a concentRated mixture of 2 mol equiv alkyl halide and 1 mol equiv 3-mercapto-2- mercaptomethyl-1-propene (A) in MeOH in one syringe and an equi-volume two mol equivalent sodium methoxide in MeOH in another syringe. Thus, two-fold excess 3-chloro-2- chloromethyl-1-propene (B) with A gave B-A-B and B-A-B- A-B as the main products but no B-A or B-A-B-A due to the mechanism involved and the low solubility of the longer oligomer in MeOH. When the reaction of 2 9 A with B was carried out, the main product was A-B-A-B-A-B-A.
Gustavo S. Cunha - One of the best experts on this subject based on the ideXlab platform.
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Removal of bromate from drinking water using a heterogeneous photocatalytic mili-reactor: impact of the reactor material and water matrix
Environmental Science and Pollution Research, 2019Co-Authors: Gustavo S. Cunha, Sara G. S. Santos, Bianca M. Souza-chaves, Márcia W.c. Dezotti, José Carlos B. Lopes, Madalena M Dias, Rui A.r. Boaventura, Tânia F C V Silva, João Paulo Bassin, Vitor J P VilarAbstract:The main goal of this study was to evaluate the removal of bromate from drinking water using a heterogeneous photocatalytic mili-photoreactor, based on NETmix technology. The NETmix mili-reactor consists of a network of channels and chambers imprinted in a back slab made of acrylic (AS) or stainless steel (SSS) sealed, through mechanical compression and o-rings, with an UVA-transparent front borosilicate glass slab (BGS). A plate of UVA-LEDs was placed above the BGS window. TiO2-P25 thin films were immobilized on the BGS (back-side illumination, BSI) or SSS (front-side illumination, FSI) by using a spray deposition method. The photoreduction Rate of a 200 μg L−1 (1.56 μM) BrO3− solution was assessed taking into account the following: (i) catalyst film thickness, (ii) catalyst coated surface and illumination mechanism (BSI or FSI), (iii) solution pH, (iv) type and dose of sacrificial agent (SA), (v) reactor material, and (vi) water matrix. In acidic conditions (pH 3.0) and in the absence of light/catalyst/SA, 28% and 36% of BrO3− was reduced into Br− only by contacting with AS and SSS during 2-h, respectively. This effect prevailed during BSI experiments, but not for FSI ones since back SSS was coated with the photocatalyst. The results obtained have demonstRated that (i) the Molar Rate of disappearance of bromates was similar to the Molar Rate of formation of bromides; (ii) higher BrO3− reduction efficiencies were reached in the presence of an SA using the FSI at pH 3.0; (iii) formic acid ([BrO3−]:[CH2O2] Molar ratio of 1:3) presented higher performance than humic acids (HA = 1 mg C L−1) as SA; (iv) high amounts of HA impaired the BrO3− photoreduction reaction; (v) SSS coated catalyst surface revealed to be stable for at least 4 consecutive cycles, keeping its photonic efficiency. Under the best operating conditions (FSI, 18 mL of 2% wt. TiO2-P25 suspension, pH 3.0), the use of freshwater matrices led to (i) equal or higher reaction Rates, when compared with a synthetic water in the absence of SA, and (ii) lower reaction Rates, when compared with a synthetic water containing formic acid with a [BrO3−]:[CH2O2] Molar ratio of 1:3. Notwithstanding, heterogeneous TiO2 photocatalysis, using the NETmix mili-reactor can be used to promote the reduction of BrO3− into Br−, attaining concentrations below 10 μg L−1 (guideline value) after 2-h reaction. Graphical Abstract.