Sulfonylurea herbicides have been widely used because of their low application rates, good crop sdeetivities and low mammalian toxicities. However, some sulfonylureas might persist unfavourably in the environment with...Sulfonylurea herbicides have been widely used because of their low application rates, good crop sdeetivities and low mammalian toxicities. However, some sulfonylureas might persist unfavourably in the environment with residual problems. In order to look for ecologically safer and environmentally benign sulfonylureas, and on keeping the pyrimidine ring being monosubstitated, 15 novd C5-monosubstituted benzenesulfonylurea compounds were synthesized. The structures of all the compounds synthesized were confirmed by demental analysis and ^1H NMR. Preliminary herbicidal activities of these new sulfonylurea compounds were determined by ALS screening ( in vitro) and pot bioassay experiments( in vivo). The herbicidal results show that some novel sulfonylureas are comparable to commercial Foramsulfuron and Monosulfuron.展开更多
Reaction products of 2,4,6-tris(4-phenyl-phenoxy)-1,3,5-triazine derived from 4-phenylphenol cyanate ester and phenyl glycidyl ether were analyzed. In addition to an isocyanurate compound and an oxazolidone compound w...Reaction products of 2,4,6-tris(4-phenyl-phenoxy)-1,3,5-triazine derived from 4-phenylphenol cyanate ester and phenyl glycidyl ether were analyzed. In addition to an isocyanurate compound and an oxazolidone compound which were well known as reaction products of cyanate esters and epoxy resins, compounds with hybrid ring structure of cyanurate/isocyanurate were determined. Gibbs free energies of the compound having hybrid ring structure of cyanurate/isocyanurate with two isocyanurate moiety were found to be lower than that of the compound with cyanurate ring structure through calculations. Calculation data supported the existence of hybrid ring structure of cy-anurate/isocyanurate. It was revealed that isomerization from cyanurate to isocyanurate occurs via hybrid ring structure of cyanurate/isocyanurate in the reaction of aryl cyanurate and epoxy.展开更多
Sulfonylurea herbicides have been applied worldwide in agriculture. Some sulfonylurea residues might exist in soil longer than that people expected. However, flupyrsulfuron-methyl-sodium which was firstly reported as ...Sulfonylurea herbicides have been applied worldwide in agriculture. Some sulfonylurea residues might exist in soil longer than that people expected. However, flupyrsulfuron-methyl-sodium which was firstly reported as a new 5-substituted sulfonylurea herbicide has less than one month residual life. Therefore, 5-substituted benzenesulfonylureas are potential molecules to regulate its residual situation. In order to develop new sulfonylurea derivatives, the substituent on the critical 5-posotion of the benzene ring was optimized. On the basis of our former work on sulfonylureas which contains a characteristic mono-substituted pyrimidine moiety, twenty-six new sulfonylurea deriva- tives were synthesized and their structures were confirmed by 1H NMR, 31p NMR and elemental analysis. The greenhouse bioassay tests show that some title compounds exhibit potent herbicidal activity.展开更多
以甘油和苯甲醛为原料,对甲苯磺酸为催化剂,制备了甘油苯甲醛缩醛,产物分为2种:4-羟甲基-2-苯基-1,3-二氧戊环(五元环)和2-苯基-1,3-二氧六环-5-醇(六元环)。分别研究了原料摩尔比、带水剂用量、催化剂用量及反应时间对反应的影响。结...以甘油和苯甲醛为原料,对甲苯磺酸为催化剂,制备了甘油苯甲醛缩醛,产物分为2种:4-羟甲基-2-苯基-1,3-二氧戊环(五元环)和2-苯基-1,3-二氧六环-5-醇(六元环)。分别研究了原料摩尔比、带水剂用量、催化剂用量及反应时间对反应的影响。结果表明,在n(甘油)∶n(苯甲醛)=1.2∶1,带水剂体积为15 m L,催化剂质量为0.15 g,反应时间为4 h的较优反应条件下,得到了缩醛产物最大收率为97%(以苯甲醛计)。利用气相色谱(GC)、气相色谱-质谱联用仪(GC-MS)、核磁共振氢谱(1H-NMR)对目标产物进行了定量和定性分析。展开更多
Fifteen 1-(4-substituted phenyl)-4-(4-bromophenyl)-5-(halo-o-hydroxyphenyl)imino-1,2,3-triazoles were designed and synthe- sized based on rational combination of 1,2,3-triazoles and (halo)o-hydroxyphenyl group...Fifteen 1-(4-substituted phenyl)-4-(4-bromophenyl)-5-(halo-o-hydroxyphenyl)imino-1,2,3-triazoles were designed and synthe- sized based on rational combination of 1,2,3-triazoles and (halo)o-hydroxyphenyl group according to the superposition principle of reinforcement of biological activities. All the compounds were tested to an in vitro antimicrobial screening against M.a. and E.c.. Compounds IIe-IIo exhibited more potent antimicrobial activities against M.a. and E.c. than triclosan and fluconazole, which provided valuable information to further study of novel antimicrobial research.展开更多
基金Supported by the National Key Basic Research Program of China(No.2003CB114406)the National Natural Science Foundation Key Project of China(No.20432010).
文摘Sulfonylurea herbicides have been widely used because of their low application rates, good crop sdeetivities and low mammalian toxicities. However, some sulfonylureas might persist unfavourably in the environment with residual problems. In order to look for ecologically safer and environmentally benign sulfonylureas, and on keeping the pyrimidine ring being monosubstitated, 15 novd C5-monosubstituted benzenesulfonylurea compounds were synthesized. The structures of all the compounds synthesized were confirmed by demental analysis and ^1H NMR. Preliminary herbicidal activities of these new sulfonylurea compounds were determined by ALS screening ( in vitro) and pot bioassay experiments( in vivo). The herbicidal results show that some novel sulfonylureas are comparable to commercial Foramsulfuron and Monosulfuron.
文摘Reaction products of 2,4,6-tris(4-phenyl-phenoxy)-1,3,5-triazine derived from 4-phenylphenol cyanate ester and phenyl glycidyl ether were analyzed. In addition to an isocyanurate compound and an oxazolidone compound which were well known as reaction products of cyanate esters and epoxy resins, compounds with hybrid ring structure of cyanurate/isocyanurate were determined. Gibbs free energies of the compound having hybrid ring structure of cyanurate/isocyanurate with two isocyanurate moiety were found to be lower than that of the compound with cyanurate ring structure through calculations. Calculation data supported the existence of hybrid ring structure of cy-anurate/isocyanurate. It was revealed that isomerization from cyanurate to isocyanurate occurs via hybrid ring structure of cyanurate/isocyanurate in the reaction of aryl cyanurate and epoxy.
基金Supported by the National Basic Research Program of China(No2010CB126106)
文摘Sulfonylurea herbicides have been applied worldwide in agriculture. Some sulfonylurea residues might exist in soil longer than that people expected. However, flupyrsulfuron-methyl-sodium which was firstly reported as a new 5-substituted sulfonylurea herbicide has less than one month residual life. Therefore, 5-substituted benzenesulfonylureas are potential molecules to regulate its residual situation. In order to develop new sulfonylurea derivatives, the substituent on the critical 5-posotion of the benzene ring was optimized. On the basis of our former work on sulfonylureas which contains a characteristic mono-substituted pyrimidine moiety, twenty-six new sulfonylurea deriva- tives were synthesized and their structures were confirmed by 1H NMR, 31p NMR and elemental analysis. The greenhouse bioassay tests show that some title compounds exhibit potent herbicidal activity.
文摘以甘油和苯甲醛为原料,对甲苯磺酸为催化剂,制备了甘油苯甲醛缩醛,产物分为2种:4-羟甲基-2-苯基-1,3-二氧戊环(五元环)和2-苯基-1,3-二氧六环-5-醇(六元环)。分别研究了原料摩尔比、带水剂用量、催化剂用量及反应时间对反应的影响。结果表明,在n(甘油)∶n(苯甲醛)=1.2∶1,带水剂体积为15 m L,催化剂质量为0.15 g,反应时间为4 h的较优反应条件下,得到了缩醛产物最大收率为97%(以苯甲醛计)。利用气相色谱(GC)、气相色谱-质谱联用仪(GC-MS)、核磁共振氢谱(1H-NMR)对目标产物进行了定量和定性分析。
基金supported by the National Natural Science Foundation of China (No. 20976135)
文摘Fifteen 1-(4-substituted phenyl)-4-(4-bromophenyl)-5-(halo-o-hydroxyphenyl)imino-1,2,3-triazoles were designed and synthe- sized based on rational combination of 1,2,3-triazoles and (halo)o-hydroxyphenyl group according to the superposition principle of reinforcement of biological activities. All the compounds were tested to an in vitro antimicrobial screening against M.a. and E.c.. Compounds IIe-IIo exhibited more potent antimicrobial activities against M.a. and E.c. than triclosan and fluconazole, which provided valuable information to further study of novel antimicrobial research.