Syntheses of DL-threo-Thiamphenicol via Green Oxidation

Liu, K; Franzén, Robert; Yu, Xia; Zhang, J; Xu, Youjun

doi:10.1016/s1005-9040(06)60171-2

Cited by 2 publications

(4 citation statements)

References 22 publications

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“…(2) For quantitative analysis on the characteristics of functional groups, all the data intensity from the FT-IR spectra measuring would be normalized by internal standard working curve methods. [1,2] According to absorption peak in 1504 cm-1 wavelength that is corresponding to a structure of the benzene ring, all the absorption intensity divided by this absorption peak in 1504 cm-1 and then compared with the original sample to analyze.…”

Section: Methodsmentioning

confidence: 99%

“…(3) For determination of terminal carboxyl group, dissolve polyester sample in chloroform/ O-Cresol solvent by heating then cool and dilute by chloroform, after that use automatic titrator to analyze with bromophenol blue as indicator and potassium hydroxide as titration. [2] (4) Coverage coefficient [3]: the formula is Krm=0.0105(P j × +P w × )/K； P j ，P w ------Density of warp and weft(number／dm); j : warp; w : weft; T j ，T w ------Yarn fineness (tex); K------Adjust factor according to fabric structure (K=1, plain).…”

Section: Methodsmentioning

confidence: 99%

“…Determination of terminal carboxyl group confirmed this in Table 4. According to calculation of molecular weight [2] , the molecular weight of sample 1 # declined from 130000 to 2600 and it of sample 2 # declined from 130000 to 6300 and it of sample 2 # declined from 130000 to 5200. Sample 2 # was the best of this sample group.…”

Section: Effect Of Coverage Coefficient On Agingmentioning

confidence: 99%

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Influence of Weaving Parameters on Aging Performance of Polyester Oxford

Chen¹

2012

AMR

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Aging performances of polyester oxford with different weaving parameters were analyzed. Filament fineness and fabric density were key parameters. The filaments’ tensile strength, the characteristic groups on the fiber surface by FTIR and the determination of terminal carboxyl group were tested, and then the changes of characteristic groups were analyzed by internal standard working curve methods. It was resulted that during the former aging, the orientation of fibers were destroyed, meanwhile the ester bonds on carboxyl decreased and ester bonds on (C-O-C) formed, and during the later aging, etching on the surface of fibers made the ester bonds sharp decreasing. Compared with different fineness, thicker fibers with one more stretch process have the higher degree of orientation, and then prolong the aging. Then compared with different fabric density, the higher density can prolong the aging, provided of no frictions harm fibers during weaving.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Effect Of Coverage Coefficient On Agingmentioning

confidence: 99%

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Influence of Weaving Parameters on Aging Performance of Polyester Oxford

Chen¹

2012

AMR

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“…Pd/C catalyzed Suzuki coupling was utilized in the preparation of different biphenyl carboxylic acids in excellent yields [5]. We also synthesized three nonsteroidal anti-inflammatory drugs Fenbufen, Flurbiprofen and Felbinac (3, Scheme 2) using this method [5][6]. The Pd/C catalyzed reaction not involving tetra-arylborates has been published previously [5,[7][8][9].…”

Section: Introductionmentioning

confidence: 99%