Syntheses of (<i>R</i>)‐ and (<i>S</i>)‐3‐Methylheptanoic Acids

Zhang, Shunji; Shi, Yong; Tian, Weisheng

doi:10.1002/cjoc.201400861

Cited by 8 publications

(9 citation statements)

References 26 publications

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“…The results implied that the best synergist effect of SA-LDH/IFR occurred at relatively low SA-LDH content. The similar trend has also been found in other nano-sized particles/IFR system [40,41].…”

Section: Resultssupporting

confidence: 89%

Synergistic effects of modified hydrotalcite on improving the fire resistance of ethylene vinyl acetate containing intumescent flame retardants

et al. 2016

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The NH2 SO3−1 intercalated MgAl‐LDH (SA‐LDH) was prepared and then introduced into ethylene vinyl acetate (EVA) in association with intumescent flame retardants (IFR) in order to improve the flame retardancy of the composite. The structure and thermal stability of SA‐LDH was characterized by Fourier transform infrared, X‐ray diffraction, transmission electron microscopy, and thermogravimetry analysis. The flame retardancy of EVA composite was evaluated by limiting oxygen index (LOI), vertical burning UL‐94, and cone calorimeter tests. The presence of only 1 wt% SA‐LDH could increase the LOI of EVA/IFR composite from 24.8 to 26.9, and significantly reduced the peak HRR value. The morphology of char after combustion was observed by scanning electron microscope, and it revealed that the presence of SA‐LDH was beneficial to form compact char structure. It was proposed that there existed synergism between SA‐LDH and IFR in improving the fire performance of EVA composite. POLYM. COMPOS., 39:522–528, 2018. © 2016 Society of Plastics Engineers

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Section: Resultssupporting

confidence: 89%

Synergistic effects of modified hydrotalcite on improving the fire resistance of ethylene vinyl acetate containing intumescent flame retardants

et al. 2016

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“…[61] Also in the case of phenols, the addition of a single explicit water molecule increased the slope from 0.50 to 0.88. [61] Zhang [62] showed that the improvement of the regression slopes required the inclusion of 1 to 2 water molecules to both the ionic and neutral species for carboxylic acids, phenols, and alcohols, while in the case of pyridines the best slope is obtained when explicit molecules are added only to the cations.…”

Section: Isodesmic Proton Exchange Reaction In Solution and Linear Rementioning

confidence: 99%

Theoretical pK_a calculations with continuum model solvents, alternative protocols to thermodynamic cycles

Casasnovas

Ortega‐Castro

Frau

et al. 2014

Int J of Quantum Chemistry

105

117

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This article reviews different formulations of the thermodynamic cycles used for the prediction of pK a values, their advantages, and disadvantages with special emphasis on the limitations resulting from the necessity of gas-phase calculations, which allow introducing some difficult cases that motivated alternative strategies. Before introducing the protocols that do not consider gas-phase calculations, the two current opinions available in the literature on the debate about the correct formalism for the calculation of free energies in solution are briefly introduced. Then, the isodesmic proton exchange reaction in solution is reviewed by analyzing its performance on difficult cases for thermodynamic cycles such as carbon acids and amino acids. The pK a values predicted by the isodesmic reaction for common acid species are also reviewed to compare their accuracy results in relation with those of thermodynamic cycles. Linear regressions between experimental pK a values and the calculated free energies obtained with the isodesmic reaction provide expressions for the dependence of the error in the calculated pK a s on the pK a difference between the studied acid and the reference species. Finally, it is shown that linear regressions correct the calculated free energies of the isodesmic reaction, when high constant precision is required in a large pK a range. The deviations from the expected behavior are equivalent to those reported previously for different pK a calculation protocols and are determined by the inaccuracies of continuum solvent models on the interactions with ionic species.

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“…In order to solve these problems, this article first established the mathematical model with the pipe diameter, thermal shrinkage, elongation at break, and number of seams as control variables by using elastic mechanics method and composite piping design. [10][11][12] Second, in order to obtain the optimal technological conditions for the preparation of polyester-ramie nonwoven, response surface analysis was used to optimize the manufacturing process, [13,14] and to investigate the effects of mixing ratio, the fiber web quantification and the needle-punched density on the thermal shrinkage of polyester-ramie nonwoven and the elongation at break of polyester-ramie nonwoven lining material. [15] Finally, the mathematical model of pipe diameter combined with the optimal technological conditions, to predict the size of pipe diameter of lining material for damaged pipelines with different pipe diameters, thus providing theoretical basis for the design of pipe diameter and preparation of tubular nonwoven composites for the nonpressure sewage pipes.…”

Section: Introductionmentioning

confidence: 99%

Design of pipe diameter of polyester‐ramie nonwoven lining material for pipeline rehabilitation

Zhang

Wang

et al. 2020

Polymer Composites

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In order to solve the problems of pipe diameter of polyester‐ramie nonwoven lining material used for sewage pipelines rehabilitation, the mathematical model of pipe diameter of lining material was established by using elastic mechanics method and composite piping design. The mixing ratio, the fiber web quantification and the needle‐punched density were selected to optimize the manufacturing process of polyester‐ramie nonwoven with thermal shrinkage rate and elongations at break, the results showed that the mixing ratio was 0.7, and the fiber web quantification was 600 g/m2, and the needle‐punched density was 180 thron/cm2. Under this process, the thermal shrinkage rate is 8.72%, and the elongation at break is 83%, which is close to the theoretical value, indicating that the response surface method has practical application value. Combined with the mathematical model and the optimal condition of manufacturing process, the design extremum of pipe diameter of lining material for sewage pipelines with different pipe diameters is predicted, which provides the theoretical basis for the preparation of polyester‐ramie nonwoven composites for pipeline rehabilitation.

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Syntheses of (R)‐ and (S)‐3‐Methylheptanoic Acids

Abstract: Starting from chiral methyl molecules 3 and 4, both derived from (R)-4-methyl-δ-valerolactone, we have accomplished the synthesis of (R) and (S)-3-methylheptanoic acids. Our methods are amendable to the syntheses of a wide variety of chiral 3-methyl alkanoic acids.

Cited by 8 publications

References 26 publications

Synergistic effects of modified hydrotalcite on improving the fire resistance of ethylene vinyl acetate containing intumescent flame retardants

Synergistic effects of modified hydrotalcite on improving the fire resistance of ethylene vinyl acetate containing intumescent flame retardants

Theoretical pK_a calculations with continuum model solvents, alternative protocols to thermodynamic cycles

Design of pipe diameter of polyester‐ramie nonwoven lining material for pipeline rehabilitation

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Syntheses of (R)‐ and (S)‐3‐Methylheptanoic Acids

Abstract: Starting from chiral methyl molecules 3 and 4, both derived from (R)-4-methyl-δ-valerolactone, we have accomplished the synthesis of (R) and (S)-3-methylheptanoic acids. Our methods are amendable to the syntheses of a wide variety of chiral 3-methyl alkanoic acids.

Cited by 8 publications

References 26 publications

Synergistic effects of modified hydrotalcite on improving the fire resistance of ethylene vinyl acetate containing intumescent flame retardants

Synergistic effects of modified hydrotalcite on improving the fire resistance of ethylene vinyl acetate containing intumescent flame retardants

Theoretical pKa calculations with continuum model solvents, alternative protocols to thermodynamic cycles

Design of pipe diameter of polyester‐ramie nonwoven lining material for pipeline rehabilitation

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Theoretical pK_a calculations with continuum model solvents, alternative protocols to thermodynamic cycles