(S)-Dimethyl-4, 4′-dimethoxy-5, 6, 5′, 6′-dimethenedioxy-biphenyl-2, 2′-dicarbonylatewas synthesized in reasonable yield through a series of reactions, including chiral oxazoline-mediated asymmetric Ullmann coupli...(S)-Dimethyl-4, 4′-dimethoxy-5, 6, 5′, 6′-dimethenedioxy-biphenyl-2, 2′-dicarbonylatewas synthesized in reasonable yield through a series of reactions, including chiral oxazoline-mediated asymmetric Ullmann coupling, from methyl 2-bromo-5-methoxy-3, 4-methenedioxy-benzoate.展开更多
A new method has been developed for separation and determination of zinc,copper,cobalt and nickel based on their colour chelates with 6,6″-dimethyl-4′-phenyl-2,2′:6′,2″-terpyridine（TPY） by ion pair high perform...A new method has been developed for separation and determination of zinc,copper,cobalt and nickel based on their colour chelates with 6,6″-dimethyl-4′-phenyl-2,2′:6′,2″-terpyridine（TPY） by ion pair high performance liquid chromatography in a reversed phase mode.The suitable conditions are the methanol-water（80:20,V/V） containing 10mmol/L NaH2PO4-H3PO4 buffer solution（pH=5.0） and 3.0mmol/L sodium dodecyl sulfonate as mobile phase,on a Symmetry C18 column（3.9mmID×150mm）,the flow rate of the mobile phase is 1.0mL/min.Spectrophotometric detection was made at 340nm.The detective limits are 0.05,0.10,2.00 and 0.50ng/mL respectively.The method has good selectivity and sensitivity.It has been applied to the separation and determination of zinc,copper,cobalt and nickel in human hair and tobacco and the result is satisfied.展开更多
文摘(S)-Dimethyl-4, 4′-dimethoxy-5, 6, 5′, 6′-dimethenedioxy-biphenyl-2, 2′-dicarbonylatewas synthesized in reasonable yield through a series of reactions, including chiral oxazoline-mediated asymmetric Ullmann coupling, from methyl 2-bromo-5-methoxy-3, 4-methenedioxy-benzoate.
文摘A new method has been developed for separation and determination of zinc,copper,cobalt and nickel based on their colour chelates with 6,6″-dimethyl-4′-phenyl-2,2′:6′,2″-terpyridine（TPY） by ion pair high performance liquid chromatography in a reversed phase mode.The suitable conditions are the methanol-water（80:20,V/V） containing 10mmol/L NaH2PO4-H3PO4 buffer solution（pH=5.0） and 3.0mmol/L sodium dodecyl sulfonate as mobile phase,on a Symmetry C18 column（3.9mmID×150mm）,the flow rate of the mobile phase is 1.0mL/min.Spectrophotometric detection was made at 340nm.The detective limits are 0.05,0.10,2.00 and 0.50ng/mL respectively.The method has good selectivity and sensitivity.It has been applied to the separation and determination of zinc,copper,cobalt and nickel in human hair and tobacco and the result is satisfied.
