A series of new Schiff bases derived from 2-aminopyridenes and various aromatic aldehydes have been synthesized and thoroughly investigated by 1H and 13C NMR spectroscopy. The imines were found to exist as only a sing...A series of new Schiff bases derived from 2-aminopyridenes and various aromatic aldehydes have been synthesized and thoroughly investigated by 1H and 13C NMR spectroscopy. The imines were found to exist as only a single E-isomer at ambient temperature. Interestingly, 1H- and 13C-NMR chemical shifts of the (CH=N) amino group are affected by the type of substituent group (X) on the aryl ring. Furthermore UV and IR Spectra of some of the title compounds are also reported.展开更多
In this paper, Jacobson’s nilpotence theorem for Lie algebras is generalized to the case of Lie superalgebras; that is, if Lie superalgebra L spanned by a nil Lie super-subset of the general linear Lie superalgebra i...In this paper, Jacobson’s nilpotence theorem for Lie algebras is generalized to the case of Lie superalgebras; that is, if Lie superalgebra L spanned by a nil Lie super-subset of the general linear Lie superalgebra is finite-dimensional, then L is triangulable on the base space.展开更多
By means of variational structure and Z2 group index theory, we obtain infinite periodic solutions to a class of second-order neutral differential equations.
By means of variational structure and Z 2 group index theory,we obtain infinite periodic solutions to a class of second-order neutral differential equations.
文摘A series of new Schiff bases derived from 2-aminopyridenes and various aromatic aldehydes have been synthesized and thoroughly investigated by 1H and 13C NMR spectroscopy. The imines were found to exist as only a single E-isomer at ambient temperature. Interestingly, 1H- and 13C-NMR chemical shifts of the (CH=N) amino group are affected by the type of substituent group (X) on the aryl ring. Furthermore UV and IR Spectra of some of the title compounds are also reported.
文摘In this paper, Jacobson’s nilpotence theorem for Lie algebras is generalized to the case of Lie superalgebras; that is, if Lie superalgebra L spanned by a nil Lie super-subset of the general linear Lie superalgebra is finite-dimensional, then L is triangulable on the base space.
基金Project supported by NNSF of China (10471155)the Foundation of the Guangdong Province Natural Science Committee (031608) a specific Foundation for PhD Specialities of Educational Department of China (20020558092).
文摘By means of variational structure and Z2 group index theory, we obtain infinite periodic solutions to a class of second-order neutral differential equations.
基金Sponsored by the key NSF of Education Ministry of China (No.207047)
文摘By means of variational structure and Z 2 group index theory,we obtain infinite periodic solutions to a class of second-order neutral differential equations.
