ChemInform Abstract: Intermediates of Chemical Assembling of Oligoorganosiloxanes in Hydrolysis of Organochlorosilanes

Chernyshev, E. A.; Ivanov, Pavel; Golubykh, D. N.

doi:10.1002/chin.200231266

Cited by 3 publications

(12 citation statements)

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“…The structure of the obtained polymer, which is a PDMS isomer, was confirmed by 29 Si NMR spectroscopy data. The authors hoped that the presence of bulky trimethylsilyl groups would lead to an increase in the free volume and a decrease in the glass transition temperature of the polymethyl(trimethylsilyloxy)siloxane in comparison with PDMS.…”

Section: Introductionmentioning

confidence: 55%

“…2. In this case 29 Si-NMR spectroscopy was rather informative. The data indicated the absence of defects in the structure of the synthesized comb-like polymers.…”

Section: Synthesis and Physical Properties Of Comb-like Polymethylsilmentioning

confidence: 91%

“…Since the polyfunctional polymer was obtained in dimethyl sulfoxide (DMSO) solution, in which the further polymeranalogous reaction was carried out, the acetoxy derivatives of dimethylsiloxane oligomers (n = 0, 1, 3, and 5) were synthesized in order to avoid the well-known interaction between chlorosilanes and DMSO [28,29] (Scheme 5).…”

Section: Synthesis Of Individual Monofunctional Methylsilyloxy Oligomersmentioning

confidence: 99%

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Comb-Like Polymethylsiloxanes. Synthesis, Structure and Properties

Obrezkova

Калинина

Pavlichenko

et al. 2014

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Comb-like polymethylsiloxanes consisting of a silsesquioxane backbone and dimethylsiloxane side chains were synthesized by means of the "grafting to" method using a linear polyfunctional matrix [SiMe(ONa)O] n and monofunctional oligomers (CH 3 ) 3 Si[OSi(CH 3 ) 2 ] n OCOCH 3 . The effects of architecture of the synthesized methylsiloxane polymers on their physicochemical properties, rheology, and behavior at the air-water interface were studied and compared with those for the linear analoguepolydimethylsiloxane.

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Section: Introductionmentioning

confidence: 55%

“…2. In this case 29 Si-NMR spectroscopy was rather informative. The data indicated the absence of defects in the structure of the synthesized comb-like polymers.…”

Section: Synthesis and Physical Properties Of Comb-like Polymethylsilmentioning

confidence: 91%

Section: Synthesis Of Individual Monofunctional Methylsilyloxy Oligomersmentioning

confidence: 99%

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Comb-Like Polymethylsiloxanes. Synthesis, Structure and Properties

Obrezkova

Калинина

Pavlichenko

et al. 2014

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“…Oscillations appear in this scheme only if the rate constant for formation of heterodimers in steps (20) and (21) is greater than that for homodimers in step (18) In the general case, RS and SR different chemically, so we have: k 4 ≠ k 5 , k 6 ≠ k 7 ≠ k 12 ≠ k 13 , k 8 ≠ k 9 ≠ k 14 ≠ k 15 and k 10 ≠ k 11 . Damped oscillations in a closed system occur for a broad range of parameters.…”

Section: Modelmentioning

confidence: 99%

“…Ivanov et al [19,20] have convincingly documented the oscillatory condensation of organosilanols (e.g., R 2 Si(OH) 2 or RR'Si(OH) 2 ). There are several analogies between the results presented in their studies and those found in our own laboratory, which have inspired us to focus on the dynamics of condensation or peptidization of chiral low-molecular-weight carboxylic acids.…”

Section: Introductionmentioning

confidence: 99%

Condensation oscillations in the peptidization of phenylglycine

et al. 2010

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In earlier studies, we showed that certain low-molecular-weight carboxylic acids (profens, amino acids, hydroxy acids) can undergo spontaneous in vitro chiral conversion accompanied by condensation to from oligomers, and we proposed two simple models to describe these processes. Here, we present the results of investigations using non-chiral high-performance liquid chromatography with diode array detector (HPLC-DAD) and mass spectrometry (MS) on the dynamics of peptidization of S-, R-, and rac-phenylglycine dissolved in 70% aqueous ethanol and stored for times up to one year. The experimental results demonstrate that peptidization of phenylglycine can occur in an oscillatory fashion. We also describe, and carry out simulations with, three models that capture key aspects of the oscillatory condensation and chiral conversion processes.

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Liquid Chromatographic Investigation of Spontaneous Oscillatory In Vitro Chiral Conversion and Spontaneous Oscillatory Condensation of Simple Carboxylic Acids in Aqueous and Nonaqueous Media

Sajewicz

Kowalska

2011

Chromatography Research International

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Oscillatory reactions are a narrow reaction type among the entity of chemical reactions and those involving purely organic compounds make a small contribution to an overall number of all known oscillatory reactions. The most abundant type is purely inorganic and mixed inorganic-organic oxidation-reduction reactions, basically because monitoring them is relatively easy (e.g., with use of potentiometric measurements). Investigation of the organic reactions can be more demanding, and then chromatography is an analytical technique of choice. In this paper, we provide an overview of chromatographic evidence with oscillatory reactions discovered in our laboratory in the course of the last several years that involve the low-molecular-weight carboxylic acids (profen drugs, amino acids, and hydroxy acids). The investigated processes comprise the oscillatory chiral conversion and the oscillatory condensation, spontaneously running in the aqueous and nonaqueous abiotic media, and they were traced with use of TLC and HPLC coupled with different detector types.

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ChemInform Abstract: Intermediates of Chemical Assembling of Oligoorganosiloxanes in Hydrolysis of Organochlorosilanes

Cited by 3 publications

References 1 publication

Comb-Like Polymethylsiloxanes. Synthesis, Structure and Properties

Comb-Like Polymethylsiloxanes. Synthesis, Structure and Properties

Condensation oscillations in the peptidization of phenylglycine

Liquid Chromatographic Investigation of Spontaneous Oscillatory In Vitro Chiral Conversion and Spontaneous Oscillatory Condensation of Simple Carboxylic Acids in Aqueous and Nonaqueous Media

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