The polymerization of acrylamide (AAM)in H_2O/DMF or in H_2O/CH_3CN mixed solvent initiated with ceric ion (Ce^(4+) )/N-(substituted phenyl)-acetamide systems have been studied. The redox polymerization was revealed b...The polymerization of acrylamide (AAM)in H_2O/DMF or in H_2O/CH_3CN mixed solvent initiated with ceric ion (Ce^(4+) )/N-(substituted phenyl)-acetamide systems have been studied. The redox polymerization was revealed by the low value of overall activation energy (E_α) of AAM polymerization using ceric ion/N-(substituted phenyl) acetamide system as an initiator. The end group of polymer formed was detected by IR spectrum analysis method, it revealed the presence of N-(m-acetoxy-methylphenyl) acetamide (m-AAe) moiety end group in the polymer obtained with ceric ion/m-AAe initiation system.展开更多
Diacetates 1 and N-[(1-benzotriazol-l-yl)alkyl]amides 2, both masked forms of aldehydes, could undergo deprotection and condensation with cycloalkanones in a one-pot procedure promoted by samarium(III) iodide (SmI3) ...Diacetates 1 and N-[(1-benzotriazol-l-yl)alkyl]amides 2, both masked forms of aldehydes, could undergo deprotection and condensation with cycloalkanones in a one-pot procedure promoted by samarium(III) iodide (SmI3) to afford α,α'-bis(substituted benzylidene) cycloalkanones in good yields.展开更多
A new N,N′ diacetic acid substituted azacrown ether containing thiophere ring ligand(H2L) has been synthesized by using salicylaldehyde, diamine, thiophene and bromoacetic acid as starting materials. With this ligand...A new N,N′ diacetic acid substituted azacrown ether containing thiophere ring ligand(H2L) has been synthesized by using salicylaldehyde, diamine, thiophene and bromoacetic acid as starting materials. With this ligand, its lanthanide complexes ·nH2O(M=La,Ce,Pr,Nd,Sm,Eu,Dy,Er,Yb;n=2 or 3) are prepared. These compounds are characterized by elemental analysis, IR, 1H NMR, MS and conductivity measurements. The results show that ether oxygen, carboxy oxygen, nitrogen atoms and nitrate ion are coordinated to the metal ion.展开更多
wenty-eight new N-2-thiazolyl and thiazolinyl-N'-substituted phenylureaswere synthesized by the reaction of the heterocycles and substituted phenyl iso-cyanates. Their cytokinin activity was examined by cucumber c...wenty-eight new N-2-thiazolyl and thiazolinyl-N'-substituted phenylureaswere synthesized by the reaction of the heterocycles and substituted phenyl iso-cyanates. Their cytokinin activity was examined by cucumber cotyledon expansionbioassay. N-thiazolyl and N-thiazolinyl-N'-(m-chlorophenyl )-ureas showed a goodPGR activity in comparison to Kinetin. The structure/activity relationship was dis-cussed.展开更多
By the treatment of N-3-bromo-3-alkenylthioamides with sodium hydroxide in DMF-H2O in the presence of tetra-butylammonium bromide,series of 6-alkylidene-5,6-dihydro-4H-1,3-thiazine derivatives were prepared in moderat...By the treatment of N-3-bromo-3-alkenylthioamides with sodium hydroxide in DMF-H2O in the presence of tetra-butylammonium bromide,series of 6-alkylidene-5,6-dihydro-4H-1,3-thiazine derivatives were prepared in moderate to good yields.The cyclization is supposed to proceed via both the intramolecular vinylic nucleophilic substitution and the elimination-addition mechanisms(formation of acetylenic intermediates)in a competitive manner.展开更多
基金The project supported by the National Natural Science Foundation of China
文摘The polymerization of acrylamide (AAM)in H_2O/DMF or in H_2O/CH_3CN mixed solvent initiated with ceric ion (Ce^(4+) )/N-(substituted phenyl)-acetamide systems have been studied. The redox polymerization was revealed by the low value of overall activation energy (E_α) of AAM polymerization using ceric ion/N-(substituted phenyl) acetamide system as an initiator. The end group of polymer formed was detected by IR spectrum analysis method, it revealed the presence of N-(m-acetoxy-methylphenyl) acetamide (m-AAe) moiety end group in the polymer obtained with ceric ion/m-AAe initiation system.
文摘Diacetates 1 and N-[(1-benzotriazol-l-yl)alkyl]amides 2, both masked forms of aldehydes, could undergo deprotection and condensation with cycloalkanones in a one-pot procedure promoted by samarium(III) iodide (SmI3) to afford α,α'-bis(substituted benzylidene) cycloalkanones in good yields.
文摘A new N,N′ diacetic acid substituted azacrown ether containing thiophere ring ligand(H2L) has been synthesized by using salicylaldehyde, diamine, thiophene and bromoacetic acid as starting materials. With this ligand, its lanthanide complexes ·nH2O(M=La,Ce,Pr,Nd,Sm,Eu,Dy,Er,Yb;n=2 or 3) are prepared. These compounds are characterized by elemental analysis, IR, 1H NMR, MS and conductivity measurements. The results show that ether oxygen, carboxy oxygen, nitrogen atoms and nitrate ion are coordinated to the metal ion.
文摘wenty-eight new N-2-thiazolyl and thiazolinyl-N'-substituted phenylureaswere synthesized by the reaction of the heterocycles and substituted phenyl iso-cyanates. Their cytokinin activity was examined by cucumber cotyledon expansionbioassay. N-thiazolyl and N-thiazolinyl-N'-(m-chlorophenyl )-ureas showed a goodPGR activity in comparison to Kinetin. The structure/activity relationship was dis-cussed.
文摘By the treatment of N-3-bromo-3-alkenylthioamides with sodium hydroxide in DMF-H2O in the presence of tetra-butylammonium bromide,series of 6-alkylidene-5,6-dihydro-4H-1,3-thiazine derivatives were prepared in moderate to good yields.The cyclization is supposed to proceed via both the intramolecular vinylic nucleophilic substitution and the elimination-addition mechanisms(formation of acetylenic intermediates)in a competitive manner.
