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полныйинформационныйкраткий
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Поисковый запрос: (<.>K=TRANSESTERIFICATION<.>)
Общее количество найденных документов : 6
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1.
Инвентарный номер: нет.
   
   S 17


    Saloutin, V. I.
    Transesterification of copper (II) beta-ketoesterates and acylpyruvates with borneol [Electronic resource] / V. I. Saloutin, P. N. Kondrat'ev, Z. E. Skryabina // Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 1993. - Vol. 42, N 5. - P858-860
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Transesterification of copper (II) acetoacetates, copper (II) trifluoroacetoacetate, and copper (II) acylpyruvates with borneol gives the copper (II) chelates of the corresponding bornyl esters in 92-95% yelds

\\EXPERT2\NBO\Russian Chemical Bulletin\1993, 42 (5), 858.pdf,
\\\\expert2\\NBO\\Russian Chemical Bulletin\\1993, 42 (5), 858.pdf
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2.
Инвентарный номер: нет.
   
   S 83


   
    Stereoselective cyclization of alkyl N-phthaloyl-4-bromoglutamates to cyclopropane derivatives [Electronic resource] / V. P. Krasnov, M. A. Koroleva, T. V. Matveeva, E. A. Zhdanova, A. N. Grishakov, N. A. Klyuev // Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 2001. - Vol. 50, № 4. - P644-648. - Bibliogr. : p. 648 (17 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
CYCLIZATION -- CYCLOPROPANE-1,2-DICARBOXYLIC ACID -- GLUTAMIC ACID -- TRANSESTERIFICATION
Аннотация: The kinetics of the reactions of alkyl N-phthaloyl-4-bromoglutamates with Et3N and KOH was investigated. The reactions proceed stercospecifically to form alkyl 1-phthalimido-cyclopropane-r-1-2-dicarboxylates. In alcohols, the reactions are accompanied by transesterification. The concerted mechanism accounting for the stereospecificity of these reactions is proposed.

\\\\Expert2\\nbo\\Russian Chemical Bulletin\\2001, 50 (4), 644.pdf
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3.
Инвентарный номер: нет.
   
   M 45


   
    Mechanism of structural networking in hydrogels based on silicon and titanium glycerolates / T. G. Khonina, A. P. Safronov, E. V. Shadrina, M. V. Ivanenko, A. I. Suvorova, O. N. Chupakhin // Journal of Colloid and Intrface Science. - 2012. - Vol. 365, № 1. - С. 81-89
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
HOFMEISTER SERIES -- TITANIUM–GLYCEROL HYDROGELS -- SCHULTZE–HARDY RULE
Аннотация: Formation of organic/inorganic hydrogels based on silicon– and titanium–glycerol precursors synthesized by transesterification of alkoxy derivatives in excess of glycerol was investigated. The precursors in excess of glycerol and obtained gels were studied by chemical and physical methods including gelation kinetics, IR spectroscopy, XRD, dynamic and electrophoretic light scattering, mechanical deformation, which disclosed the basic difference in the gelation mechanism and structure of network in the hydrogels. Due to this difference, the gelation time of silicon– and titanium–glycerol precursors depended on pH or electrolyte addition in an opposite way. In the wide pH range, silicon–glycerol hydrogel was a polymeric single-phase system formed by the polymeric network homogeneously swollen in liquid water/glycerol medium. Flory–Rehner theory applied to the elastic modulus of these gels gave 40–180 monomer base units in the subchains of the network depending on water content in the gel. The mechanism of networking was three-dimensional polycondensation promoted by the electrically charged functional groups attached to the flexible polymeric chains. Electrolyte solutions provided the gelation according to Hofmeister series. Titanium–glycerol hydrogels were heterogeneous colloid systems at pH > 1.5 and single-phase polymeric gels at lower pH. Electrolyte solutions provided the gelation according to Schultze–Hardy rule

\\\\Expert2\\nbo\\Journal of Colloid and Interface Science\\2012, v.365, p.81.pdf
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4.
Инвентарный номер: нет.
   
   K 96


    Kuznetsov, V. A.
    Development of complex approach to the synthesis of trimethylene carbonate as a monomer for biodegradable polymers [Electronic resource] / V. A. Kuznetsov, M. G. Pervova, A. V. Pestov // Russian Journal of Organic Chemistry (Translation of Zhurnal Organicheskoi Khimii). - 2014. - Vol.50, №5. - С. 654-658. - Bibliogr. : p. 658 (30 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
POLYMERS -- TRIMETHYLENE CARBONATE -- DIALKYL CARBONATES
Аннотация: With the aim of production of polymers for medicine a new preparation method was developed for trimethylene carbonate based on transesterification with trimethylene glycol of dialkyl carbonates obtained without the use of phosgene. As initial reagents alkylene carbonates or polycarbonates and titanium alkoxides can be utilized. The advantages of this approach consist in obtaining some additional useful substances and the possibility of reprocessing polycarbonate wastes

\\\\expert2\\nbo\\Russian Journal of Organic Chemistry\\2014, 50, (5), 654-658.pdf
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5.
Инвентарный номер: нет.
   
   P 58


   
    Phosgene-free synthesis of symmetric bis(polyfluoroalkyl) carbonates / A. M. Semenova, M. A. Ezhikova, M. I. Kodess [et al.] // Mendeleev Communications. - 2021. - Vol. 31, № 2. - P257-258
ББК Г
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
TRANSESTERIFICATION -- TITANIUM ALKOXIDES -- POLYFLUOALKANOLS -- DIALKYL CARBONATES -- ORGANOFLUORINE COMPOUNDS
Аннотация: A phosgene-free synthesis of symmetric bis(polyfluoroalkyl) carbonates involves the transesterification of diphenyl carbonate with polyfluoroalkanols promoted by stoichiometric amounts of titanium(iv) alkoxides.

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6.
Инвентарный номер: нет.
   
   T 82


   
    Transesterification of dialkyl carbonates with fluorine-containing alcohols / A. M. Semenova, M. G. Pervova, M. A. Ezhikova [et al.] // Russian chemical bulletin. - 2021. - Vol. 70, № 5. - P933-936
ББК Г
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Reactions of transesterification of dimethyl, diethyl and dibutyl carbonates with 2,2,3,3-tetrafluoroethyl-, 2,2,3,3,4,4,5,5-octafluorobutyl- and 2,2,3,3,4,4,5,5,6,6,7,7-dodecafluorohexyl-carbinols were investigated in the presence of various catalysts. It was found that the conversion of starting dialkyl carbonate increases upon increasing the length of fluorine-containing radical in the presence of sodium alkoxide. It was shown that the maximum conversion of dimethyl carbonate (90%) was achieved in its reaction with 2,2,3,3,4,4,5,5-octafluoropentan-1-ol upon using catalysts such as K2CO3, NaOH, and sodium alkoxide. To achieve similar values of the conversion, Ti(OEt)4 and Ti(OiPr)4 should be used in the cases of diethyl and dibutyl carbonates, respectively.

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