The title compounds 6a—6f were prepared with high yield via intramolecular Wittig reaction of methyl 3-perfluoroalkyl-6-perfluoroacyl-2-triphenylphosphoranylidenehex-3,5-dienoates (5a—5i)which were obtained from the...The title compounds 6a—6f were prepared with high yield via intramolecular Wittig reaction of methyl 3-perfluoroalkyl-6-perfluoroacyl-2-triphenylphosphoranylidenehex-3,5-dienoates (5a—5i)which were obtained from the reaciton of 3-perfluoroacylprop-2-enylidenetriphenylphos- phoranes(3a—3c)with methyl perfluoroalkynoates(4a—4c).展开更多
A new spectrofluorimetric method for determination of trace terbium based on its reaction with 2.6-his-(1'-phenyl-3'-methyl-5'- pyridinediacyl (H_2PMBPP) and N- cetylpyridium bromide (CPB). at an apparent ...A new spectrofluorimetric method for determination of trace terbium based on its reaction with 2.6-his-(1'-phenyl-3'-methyl-5'- pyridinediacyl (H_2PMBPP) and N- cetylpyridium bromide (CPB). at an apparent pH=5.0 provided by a hexamethylenetetramine (5% w/w)-hydrochloric acid buffer,is propesed. The calibration graph is linear in the ran ge from展开更多
A new method for synthesizing 2,6-dichlorodiphenylamine was presented in this article.2,6-dichlorodiphenylamine is the key intermediate for the preparing of diclofenac sodium.It was synthesized in a one-shot reaction ...A new method for synthesizing 2,6-dichlorodiphenylamine was presented in this article.2,6-dichlorodiphenylamine is the key intermediate for the preparing of diclofenac sodium.It was synthesized in a one-shot reaction with 2,6-dichlorophenol,a solution of sodium methoxide in methanol,methyl chloroacetate,aniline,and sodium hydroxide as raw materials by the acid-base neutralization,etherification,ammonolysis of ester,Smiles rearrangement of amide,and alcoholysis or hydrolysis of the rearrangement product.Based on many times of experiment,the best technological condition was found.The yield of target compound was about 91%.展开更多
基金Project supported by the National Natural Science Foundation of China
文摘The title compounds 6a—6f were prepared with high yield via intramolecular Wittig reaction of methyl 3-perfluoroalkyl-6-perfluoroacyl-2-triphenylphosphoranylidenehex-3,5-dienoates (5a—5i)which were obtained from the reaciton of 3-perfluoroacylprop-2-enylidenetriphenylphos- phoranes(3a—3c)with methyl perfluoroalkynoates(4a—4c).
基金The authors are gratelbl for financial supports IYom the National Natural Science roundation of Chinathe Educational Commiss
文摘A new spectrofluorimetric method for determination of trace terbium based on its reaction with 2.6-his-(1'-phenyl-3'-methyl-5'- pyridinediacyl (H_2PMBPP) and N- cetylpyridium bromide (CPB). at an apparent pH=5.0 provided by a hexamethylenetetramine (5% w/w)-hydrochloric acid buffer,is propesed. The calibration graph is linear in the ran ge from
文摘A new method for synthesizing 2,6-dichlorodiphenylamine was presented in this article.2,6-dichlorodiphenylamine is the key intermediate for the preparing of diclofenac sodium.It was synthesized in a one-shot reaction with 2,6-dichlorophenol,a solution of sodium methoxide in methanol,methyl chloroacetate,aniline,and sodium hydroxide as raw materials by the acid-base neutralization,etherification,ammonolysis of ester,Smiles rearrangement of amide,and alcoholysis or hydrolysis of the rearrangement product.Based on many times of experiment,the best technological condition was found.The yield of target compound was about 91%.
