Electrogenerated N-heterocyclic carbene (NHC), obtained by cathodic reduction of Bmim-BF4, behaves as organocatalyst and base in the Staudinger synthesis from an acyl chloride and a deactivated imine in ionic liquid t...Electrogenerated N-heterocyclic carbene (NHC), obtained by cathodic reduction of Bmim-BF4, behaves as organocatalyst and base in the Staudinger synthesis from an acyl chloride and a deactivated imine in ionic liquid to yield ?-lactams. The effect of many parameters (temperature, amount of electricity, substituents, presence of an external base) has been evaluated and a tentative mechanism for the Staudinger synthesis in a very polar medium like the ionic liquid reported. The yields of isolated ?-lactams are good, starting from non-electrophilic imines, and predominantly trans lactams are obtained with a good diastereomeric ratio.展开更多
Electroantennograms(EAGs)were obtained for Holcocerus insularis Staudinger exposed to the female sex pheromone extracts and standard compounds.The male response profiles to the female sex pheromone extracts were raise...Electroantennograms(EAGs)were obtained for Holcocerus insularis Staudinger exposed to the female sex pheromone extracts and standard compounds.The male response profiles to the female sex pheromone extracts were raised with the increasing of glands.Of compounds tested 12 elicited conspicuous EAG responses,mostly as negative deflections about 2~6 mv in amplitude with a time courses of 2.0~2.7 second.Z 9 tetradecenyl acetate(Z9 14:Ac)and Z 5 dodecenyl acetate(Z5 12:Ac) could elicit highest EAG responses,but C 16 ,C 18 acetates lowest.It revealed that sex pheromone components simillar to C 12 , C 14 acetates probably existed in the pheromone of Holcoceris insularis Staudinger.The dosage\|response curve of Z9 14:Ac roughly took a“S” shape.展开更多
文摘Electrogenerated N-heterocyclic carbene (NHC), obtained by cathodic reduction of Bmim-BF4, behaves as organocatalyst and base in the Staudinger synthesis from an acyl chloride and a deactivated imine in ionic liquid to yield ?-lactams. The effect of many parameters (temperature, amount of electricity, substituents, presence of an external base) has been evaluated and a tentative mechanism for the Staudinger synthesis in a very polar medium like the ionic liquid reported. The yields of isolated ?-lactams are good, starting from non-electrophilic imines, and predominantly trans lactams are obtained with a good diastereomeric ratio.
文摘Electroantennograms(EAGs)were obtained for Holcocerus insularis Staudinger exposed to the female sex pheromone extracts and standard compounds.The male response profiles to the female sex pheromone extracts were raised with the increasing of glands.Of compounds tested 12 elicited conspicuous EAG responses,mostly as negative deflections about 2~6 mv in amplitude with a time courses of 2.0~2.7 second.Z 9 tetradecenyl acetate(Z9 14:Ac)and Z 5 dodecenyl acetate(Z5 12:Ac) could elicit highest EAG responses,but C 16 ,C 18 acetates lowest.It revealed that sex pheromone components simillar to C 12 , C 14 acetates probably existed in the pheromone of Holcoceris insularis Staudinger.The dosage\|response curve of Z9 14:Ac roughly took a“S” shape.