To counter the lack of consensus of opinion on mineralizations of Ta, Nb and W which have genetic relationship to fluorine-rich albite granite and the want of experimental evidence at present, some experiments reporte...To counter the lack of consensus of opinion on mineralizations of Ta, Nb and W which have genetic relationship to fluorine-rich albite granite and the want of experimental evidence at present, some experiments reported in this study were carried out. The purpose of this study is to explain the genetic connection of Ta, Nb and W ore deposits and possible mechanism of their mineralization with the aid of the experimental results.展开更多
Twelve new nitrogen-oxygen donor macrocycles have been synthesized by condensation or N,N-bis[2-(2-formylphenoxy)ethyl]-4-methylphenylsulfonamide with diamines followed by a one pot reduction of the corresponding Schi...Twelve new nitrogen-oxygen donor macrocycles have been synthesized by condensation or N,N-bis[2-(2-formylphenoxy)ethyl]-4-methylphenylsulfonamide with diamines followed by a one pot reduction of the corresponding Schiff-base derivatives, The 4-methylphenylsulfonyl group can be removed by Na-Hg(6%) in methanol. All of the new aza-crowns were identified by EA, NMR, IR and MS.展开更多
Six kinds of new ditopic receptor macrocycles were synthesized by the condensation of 1,10-bis(4-formylphenyl)-1,4,7,10-tetraoxadecane or 1,10-bis(4-formyl-2-methoxyphenyl)-1,4,7,10-tetraoxadecane with polyamines. The...Six kinds of new ditopic receptor macrocycles were synthesized by the condensation of 1,10-bis(4-formylphenyl)-1,4,7,10-tetraoxadecane or 1,10-bis(4-formyl-2-methoxyphenyl)-1,4,7,10-tetraoxadecane with polyamines. The macrocycles were characterized by elemental analysis, IR, H-1 MMR.展开更多
文摘To counter the lack of consensus of opinion on mineralizations of Ta, Nb and W which have genetic relationship to fluorine-rich albite granite and the want of experimental evidence at present, some experiments reported in this study were carried out. The purpose of this study is to explain the genetic connection of Ta, Nb and W ore deposits and possible mechanism of their mineralization with the aid of the experimental results.
文摘Twelve new nitrogen-oxygen donor macrocycles have been synthesized by condensation or N,N-bis[2-(2-formylphenoxy)ethyl]-4-methylphenylsulfonamide with diamines followed by a one pot reduction of the corresponding Schiff-base derivatives, The 4-methylphenylsulfonyl group can be removed by Na-Hg(6%) in methanol. All of the new aza-crowns were identified by EA, NMR, IR and MS.
文摘Six kinds of new ditopic receptor macrocycles were synthesized by the condensation of 1,10-bis(4-formylphenyl)-1,4,7,10-tetraoxadecane or 1,10-bis(4-formyl-2-methoxyphenyl)-1,4,7,10-tetraoxadecane with polyamines. The macrocycles were characterized by elemental analysis, IR, H-1 MMR.
