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| 11. |
Computer‐assisted optimization for the selection of mobile phase in semi‐preparative HPLC |
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Chinese Journal of Chemistry,
Volume 11,
Issue 1,
1993,
Page 71-75
Qin‐Sun Wang,
Ru‐Yu Gao,
Bing‐Wen Yan,
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摘要:
AbstractA computer‐assisted method is presented for optimization for the selection of mobile phase composition in semi‐preparative HPLC. The optimization for the expected separation is based on a polynomial estimation from five preliminary runs. Statistical scanning technique was used for optimization. Double criteria simulation system (DCSS) is established for chromatographic performance measurement in this method. The validity of the optimization strategy is confirmed by applying it to a technical Cypermethrin separation. Excellent agreement is obtained between the predicted and experimental resu
ISSN:1001-604X
DOI:10.1002/cjoc.19930110111
出版商:Wiley‐VCH Verlag GmbH&Co. KGaA, Weinheim
年代:1993
数据来源: WILEY
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| 12. |
The correlation between molecular structure parameters ofO‐ethylN‐isopropyl phosphoro(thioureido) thioates and their retention data in RP‐HPLC |
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Chinese Journal of Chemistry,
Volume 11,
Issue 1,
1993,
Page 76-80
Qin‐Sun Wang,
Ru‐Yu Gao,
Hua‐Zheng Yang,
Bing‐Wen Yan,
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PDF (275KB)
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摘要:
AbstractA retention prediction system (RPS) of sevenO‐ethylN‐isopropyl phosphoro(thioureido)‐thioates in reversed phase HPLC was investigated. The system is based on the solvent selectivity triangle concept. Three molecular structure parameters (hydrophobicityII, substituent lengthL, and substituent maximum withB5) were used to describe the quantitative structure‐retention relationships. With these quantitative relationships, the retention behaviours of other eight homologs for different mobile phase composition were predicted. The predicted values were consistent with the measured values within relative error of 10%, which means that it is possible to apply the reported method to predict retention values for qualitative purposes for different mobile phase compo
ISSN:1001-604X
DOI:10.1002/cjoc.19930110112
出版商:Wiley‐VCH Verlag GmbH&Co. KGaA, Weinheim
年代:1993
数据来源: WILEY
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| 13. |
Phosphonium and arsonium ylides. XVII. A facile synthesis of methyl 2,6‐bisperfluoroalkylbenzoates via acyclic precursors |
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Chinese Journal of Chemistry,
Volume 11,
Issue 1,
1993,
Page 81-85
Wei‐Yu Ding,
Wei‐Guo Cao,
Zhen‐Rong Xu,
Zhi‐Jian Shi,
Yuan Yao,
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摘要:
AbstractThe title compounds 6a—6f were prepared with high yield via intramolecular Wittig reaction of methyl 3‐perfluoroalkyl‐6‐peifluoroacyl‐2‐triphenylphosphoranylidenchex‐3,5‐dienoates (5a—5i) which were obtained from the reaction of 3‐perfluoroacylprop‐2‐enylidenetriphenylphosphoranes (3a—3c) with methyl pe
ISSN:1001-604X
DOI:10.1002/cjoc.19930110113
出版商:Wiley‐VCH Verlag GmbH&Co. KGaA, Weinheim
年代:1993
数据来源: WILEY
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| 14. |
Stereospecific synthesis of (E)‐furfurylalkenes from alkenyldisiamylboranes and furfuryl chloride |
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Chinese Journal of Chemistry,
Volume 11,
Issue 1,
1993,
Page 86-90
Nan‐Sheng Li,
Yan Chen,
Min‐Zhi Deng,
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摘要:
AbstractThe Pd(PPh2)4‐catalyzed coupling reaction of alkenyl‐disiamylboranes with furfuryl chloride in the presence of f‐BuOK afforded (E)‐furfurylalkenes stereospecifically in good
ISSN:1001-604X
DOI:10.1002/cjoc.19930110114
出版商:Wiley‐VCH Verlag GmbH&Co. KGaA, Weinheim
年代:1993
数据来源: WILEY
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| 15. |
Palladium(0) catalyzed reactions of propargylic carbonates and dialkyl cycloalkanone‐α,α‐dicarboxylates |
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Chinese Journal of Chemistry,
Volume 11,
Issue 1,
1993,
Page 91-94
Li‐Feng Geng,
Xi‐Yan Lu,
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PDF (180KB)
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摘要:
AbstractPropargylic carbonates reacted with dialkyl cycloalkanone‐α,α′‐dicarboxylates under the catalysis of Pd(0) complex to give bicyclic compounds in high yields. The two electron‐withdrawing groups at α and α' positions of cycloalkanone rings are essential for the annulati
ISSN:1001-604X
DOI:10.1002/cjoc.19930110115
出版商:Wiley‐VCH Verlag GmbH&Co. KGaA, Weinheim
年代:1993
数据来源: WILEY
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