A Synthesis of Heteroaromatic S- and N-β-Glycosides of N-Acetylglucosamine under Phase-Transfer Conditions

By usage of the technical and economic calculation method developed by the authors for installations with recuperative-type heat exchangers, the operational modes of the centralized supply and exhaust system of organized ventilation, in which the supplying air is heated by the solar radiation heat and the heat of the air removed from the premises, have been investigated in the paper. The paper presents results of the thermal and economic efficiency assessment of such ventilation system for multi-storey buildings. A comparison of the thermal energy consumption for the needs of heating and ventilation through the use of the proposed ventilation system has been made for two variants of buildings – with the thermal protection level of enclosing structures that meets modern regulatory requirements (buildings with heat consumption up to 130 kW×h/(m2×year)), and for a building similar in terms of planning structure, but with enclosing structures, the insulation level of which corresponds to buildings built before 1993 (buildings with heat consumption up to 260 kW×h/(m2×year)). The temperature conditions have been determined under which it becomes necessary to turn on the operation of devices for additional (peak) heating of the supply air, when the thermal potential of solar radiation and secondary energy resources is insufficient to provide the calculated temperature of the supply air. For the ventilation system under consideration, it has been established that the thermal resistance of the building envelope influences the indicators of the thermodynamic and economic efficiency of the proposed solution. The climatic conditions under which the utilization of the exhaust air heat in the proposed ventilation system is technically justified and economically expedient have been determined. The results of the research

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Section: постановка задачи и описание методики исследованияunclassified

Effectiveness Assessment of Energy-Saving System of Organized Supply and Exhaust Ventilation for Multi-Storey Buildings with Low Level Thermal Protection

et al. 2022

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Regioselective synthesis, characterization and antimicrobial evaluation of S-glycosides and S,N-diglycosides of 1,2-Dihydro-5-(1H-indol-2-yl)-1,2,4-triazole-3-thione

Ashry

Tamany

Fattah

et al. 2013

European Journal of Medicinal Chemistry

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The synthesis of N-acetylglucosamine heteroaromatic N-β-glycosides under phase transfer conditions: Part III. 1,2,4-triazolin-3-one glucosaminides

et al. 2011

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The catalytic phase transfer reactions of 2-acetamido-3,4,6-tri-O-acetyl-2-deoxy-a-D-glucopyranosyl chloride with thiosubstituted 4-phenyl-5-R-thio-Delta2-1,2,4-triazolin-3-ones in solid alkali-organic solvent and in aqueous alkali-organic solvent were studied. The main products ofglucosaminilation reaction are the appropriate N-beta-glucosaminides. The effect of reaction conditions on the yield and composition of products formed was elucidated on the example of the reaction alpha-D-glucosaminyl chloride with 5-methylthio-4-phenyl-Delta2-1,2,4-triazolin-3-one. The optimal conditions of phase transfer glycosylation were established. N-1,2-trans-grycosidic bond formation was proved by 1H NMR and IR data as well as a comparison with spectral data obtained previously for the glycosides of similar structure.

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A Synthesis of Heteroaromatic S- and N-β-Glycosides of N-Acetylglucosamine under Phase-Transfer Conditions

Cited by 5 publications

References 20 publications

Effectiveness Assessment of Energy-Saving System of Organized Supply and Exhaust Ventilation for Multi-Storey Buildings with Low Level Thermal Protection

Effectiveness Assessment of Energy-Saving System of Organized Supply and Exhaust Ventilation for Multi-Storey Buildings with Low Level Thermal Protection

Regioselective synthesis, characterization and antimicrobial evaluation of S-glycosides and S,N-diglycosides of 1,2-Dihydro-5-(1H-indol-2-yl)-1,2,4-triazole-3-thione

The synthesis of N-acetylglucosamine heteroaromatic N-β-glycosides under phase transfer conditions: Part III. 1,2,4-triazolin-3-one glucosaminides

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