• Bulletin of the Korean Chemical Society
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• v.20 no.10
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• pp.1195-1199
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• 1999

2-(2,4,5-Trimethoxyphenyl)-4-methylene-1,3-dioxolane (1b), 2-(2,4,6-trimethoxyphenyl)-4-methylene-1,3-di-oxolane (2b), and 2-(3,4,5-trimethoxyphenyl)-4-methylene-1,3-dioxolane (3b) were prepared and polymerized with boron trifluoride. Boron trifluoride catalyzed reaction proceeded via mainly ring-opening polymerization and cyclization reaction to yield poly(keto ether) and 3(2H)-dihydrofuranone. The yields of polymer and cyclized product exhibited a dependency on the position of the methoxy substituents in the benzene ring of 2-phenyl-4-methylene-1,3-dioxolane derivatives. Electrophilic attack of methylene or oxygen atom on 4-meth-ylene-1,3-dioxolane ring were suggested for the polymerization and cyclization.

• Polymer(Korea)
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• v.32 no.5
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• pp.478-482
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• 2008

The effect of 1,3-dioxolane on the structural development in the optical polycarbonate film was studied. The 1,3-dioxolane was used as an environmental friendly solvent for manufacturing solution-cast polycarbonate film instead of methylene chloride. The evaporation rate in film drying process decreased due to the high boiling temperature of 1,3-dioxolane. This caused the crystallization in the polycarbonate film. As a result, The increase of crystallinity and roughness led to the decrease of light transmissivity. It was also found that the lowering of mechanical properties in polycarbonate film was attributed to the morphological change due to the solvent evaporation rate in film drying process.

• YAKHAK HOEJI
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• v.33 no.1
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• pp.10-14
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• 1989

As potential xanthine bronchodilators related to Doxofylline (1b), 2-(7-theophyllineethyl)-1,3-dioxolane (3), 7-(3,3-dimethoxypropyl) theophylline(5), 2-methyl, 2-(7-theophyllinemethyl)-1,3- dioxolane (8a), 2-phenyl, 2-(7-theophyllinemethyl)-1,3-dioxolane (8b) and 2-(7-theophyllinemethyl)-1,3-benzodioxolane(14) were synthesized from theophylline (1a).

• Bulletin of the Korean Chemical Society
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• v.20 no.6
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• pp.663-666
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• 1999

The 4-methylene-1,3-dioxolane(4-MDO) derivatives with dimethoxyphenyl group on the 2-position of 1,3-dioxolane ring, 2-(x,y-dimethoxyphenyl)-4-MDO derivatives (x,y=2,3(1b), 2,4(2b), 2,5(3b) and 3,4(4b)) were prepared by acelalizationof the corresponding benzaldehyde with 3-chloro-1,2-propanediol, followed by dehydrochlorination. 2-(Dimethoxy)phenyl-4-MDO derivatives underwent polymerization wiht ring opening as will as cyclization reaction to afford a mixture of the ring-opened polymer and 3(2H)-dihydrofuranone derivative with boron trifluoride as a cationic catalyst. Both the methylene group and 1,3-dioxolane ring were participated in the reaction with cationic catalyst. The key intermediate of the polymerization is a benzyl cation generated by ring opening, and the cyclization reaction proceed via proton addition to oxygen atom of 1,3-dioxolane ring.

• Polymer(Korea)
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• v.32 no.5
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• pp.483-488
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• 2008

The effect of methylene chloride/1,3-dioxolane co-solvent on the crystallization in the optical polycarbonate film was investigated. Increasing 1,3-dioxolane content in co-solvent resulted in the crystallization due to the lowering of solvent evaporation rate during film drying process. The crystallization in PC film could be minimized by either controlling of solvent composition and increasing solvent drying temperature. It was found that the surface roughness of solution casting PC film was affected by both crystallization and solvent evaporation rate. This morphological effect by alternative solvent is ascribed to a large decrease in light transmissivity on the optical PC film.

• Journal of the Korean Chemical Society
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• v.22 no.2
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• pp.99-104
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• 1978

The synthesis of a bidentate secondary amine ligand, 2,2-bis(methylaminomethyl-2,3-dioxolane(methylaminomethyl)-1,3-dioxolane(mexo) and the preparation of dichloro and trans-R-cyclohexanediamine platinum(II) complexes of this ligand are reported. The structures of the ligand and complexes prepared have been elucidated via elemental analyses, nmr, electronic absorption, and CD spectra.

• Membrane Journal
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• v.33 no.3
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• pp.94-109
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• 2023

1,3-Dioxolane is an exciting material that has attracted widespread interest in the chemical, paint, and pharmaceutical industries as a solvent, electrolyte, and reagent because 1,3-dioxolane is not toxic, carcinogenic, explosive, auto-flammable, and multifunctional, and due to their excellent miscibility in most organic and aqueous solvent conditions. Recently, this material has received increasing attention as a CO₂-selective polymer precursor to separating CO₂ from flue gas and natural gas mixtures. Poly(1,3-dioxolane) (PDXL) possesses higher ether oxygen content than polyethylene oxide (PEO), which demonstrates superior membrane CO₂/N₂ separation properties owing to their polar ether oxygen groups exhibiting strong affinity toward CO₂. Thus, PDXL-based membranes displayed an outstanding CO₂ solubility selectivity over non-polar (N₂, H₂, and CH₄) gases. However, the polar groups of PDXL, like PEO, promote chain packing efficiency and cause polymer crystallization, thereby reducing its gas permeability, which should be improved. In this short review, we discuss the recent advancement and limitations of PDXL membranes in gas separation applications. To conclude, we provide future perspectives for inhibiting the limits of 1,3-dioxolane-based polymers in the CO₂ separation process.

• Bulletin of the Korean Chemical Society
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• v.20 no.12
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• pp.1433-1436
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• 1999

The 2-(2,4-dimethoxyphenyl)-4-MDO (2) underwent polymerization with ring opening as well as cyclization reaction in the presence of various cationic catalysts such as boron trifluoride, trifluoromethanesulfonic acid, p-toluenesulfonic acid, hydrochloric acid and trifluoroacetic acid. They afforded a mixture of the ring-opened poly(keto ether) and 3(2H)-dihydrofuranone derivative. Both the methylene group and oxygen atom of 1,3-dioxolane ring were participated in the reaction with cationic catalyst. The contents of the polymer and cyclization product were variable according to the acid strength of the cationic catalysts.

• Macromolecular Research
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• v.9 no.4
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• pp.206-209
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• 2001

One of the approaches to obtain functional polymer is polymerization of a monomer having two functional groups. Although polymerization of a monomer having two different types of functional group is general, the author has been interested in the polymerization of a monomer having two similar types of functional group. This work shows the preparation and selective polymerization of 4-methylene-2-styryl-1,3-dioxolane having two similar reactive double bonds via cationic polymerization at ambient temperature. Cationic ring-opening polymerization of 4-methylene-2-styryl-1,3-dioxolane using benzylsulfonium salt as a photo-initiator quantitatively afforded high molecular weight of poly(keto-ether).

• Journal of the Korean Society of Industry Convergence
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• v.14 no.1
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• pp.9-14
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• 2011

The excess molar enthalpies $H_m^E$ at T=298.15 K and p=101.3 kPa of ternary system {1,2-dichloropropane (1,2-DCP) + 1,3-dioxolane+ 1,4-dioxane} were predicted by using the binary contribution model of $Radojkovi{\check{c}}$ with correlated sub-binary Redlich-Kister parameters. Excess partial molar enthalpies ${\bar{H}}_i^E$ were also calculated for the binary systems {1,2-dichloropropane + 1,3-dioxolane}, {1,2-dichloropropane + 1,4-dioxane} and {1,3-dioxolane + 1,4-dioxane} using adjustable parameters of Redlich-Kister equation. By extrapolation of excess partial molar enthalpies to infinite dilution, limiting excess partial molar enthalpies ${\bar{H}}_i^{E,{\infty}}$ of each component were also obtained. The ternary excess molar enthalpies excess partial molar enthalpies of these sub-binary systems have been calculated by using our previously reported results.