Bis-benzimidazolium salt 1 was prepared via a series of reactions using 2,2＇-diphenol as starting material. Compound 2 was afforded through the intramolecular C--C coupling reaction of 1 under the catalysis of Pd（OA...Bis-benzimidazolium salt 1 was prepared via a series of reactions using 2,2＇-diphenol as starting material. Compound 2 was afforded through the intramolecular C--C coupling reaction of 1 under the catalysis of Pd（OAc）2. The structure of 2 is characterized through X-ray diffraction analyses, 1H NMR and 13C NMR. In 2, two boat-like seven-membered rings are contained, where the C--C bond distance newly formed is 1.461（5） A, and it is between regular C--C single bond （1.54 A） and C=C double bond （1.34 A）. This shows that new C--C bond has partial double-bond character. In the crystal packing of 2, the 2D supramolecular layers are formed via C--H..-F hydrogen bond.展开更多
A new synthetic method of ketones from substituted benzimidazolium salts and Grignard reagents is reported. The influences of the various Grignard reagents on the yield of ketones and the mechanism are discussed.
Based on the one carbon unit transfer reaction of tetrahydrofolate coenzymes, hydratropic aldehyde was synthesized successfully by using benzimidazolium salt as tetrahydrofolate coenzyme model at formic acid oxidation...Based on the one carbon unit transfer reaction of tetrahydrofolate coenzymes, hydratropic aldehyde was synthesized successfully by using benzimidazolium salt as tetrahydrofolate coenzyme model at formic acid oxidation level and Grignard reagent as a nucleophile to which one carbon unit was transfered. A novel method for the preparation of hydratropic aldehyde was provided. The mechanism for the addition hydrolysis reaction of benzimidazolium salt with Grignard reagent and the effects of reaction condition on the yield are discussed.展开更多
The present paper covers a novel method for the preparation of α-naphthylacetone via the addition-hydrolysis reaction of a 2-（α-naphthylmethyl）benzimidazolium salt with Grignard reagent.The IR spectrum,MS and 1H N...The present paper covers a novel method for the preparation of α-naphthylacetone via the addition-hydrolysis reaction of a 2-（α-naphthylmethyl）benzimidazolium salt with Grignard reagent.The IR spectrum,MS and 1H NMR of the title compound are consistent with those reported.This method provides a convenient and inexpensive access to the title compound.The mechanism for the addition-hydrolysis reaction of benzimi-（dazolium） salt with Grignard reagent and the effects of reaction conditions on the yield are discussed.展开更多
The bis-benzimidazolium salt bis[2-（N-ethylbenzimidazoliumyl）ethyl]amine hexafluorophosphate（LH2·（PF6）2） and its N-heterocyclic carbene silver（Ⅰ） complex[L2Ag3]（PF6）3（1）have been prepared and charact...The bis-benzimidazolium salt bis[2-（N-ethylbenzimidazoliumyl）ethyl]amine hexafluorophosphate（LH2·（PF6）2） and its N-heterocyclic carbene silver（Ⅰ） complex[L2Ag3]（PF6）3（1）have been prepared and characterized.In complex 1,a trinuclear silver（Ⅰ） architecture is formed by two tridentate ligands and three silver（I） atoms,in which one 12- and two 7-membered rings are contained.In the crystal packing of 1,1D chain and 2D supramolecular layer are formed via intermolecular weak interactions,including π…π interactions and C-H…π contacts.Additionally,the fluorescence emission spectra of LH2-（PF6）2 and 1 are described.展开更多
N-丁基苯并咪唑与9,10-二(氯甲基)蒽在加热条件下反应生成氮杂环卡宾盐,接着与六氟磷酸钾进行阴离子交换,形成双(苯并咪唑-2-叶立德)蒽六氟磷酸盐配体1,再将配体1和氧化汞反应生成双(苯并咪唑-2-叶立德)蒽-汞(Ⅱ)配合物2。通过1 H NMR、...N-丁基苯并咪唑与9,10-二(氯甲基)蒽在加热条件下反应生成氮杂环卡宾盐,接着与六氟磷酸钾进行阴离子交换,形成双(苯并咪唑-2-叶立德)蒽六氟磷酸盐配体1,再将配体1和氧化汞反应生成双(苯并咪唑-2-叶立德)蒽-汞(Ⅱ)配合物2。通过1 H NMR、13 C NMR和单晶衍射确定其分子结构,对配体1和配合物2的紫外和荧光性质进行了研究。展开更多
1,3-dimethyl-2-substituted benzimidazolium salt can be easily prepared from carboxylic acid,o-phenylenediamine and methyl iodide via cyclization and quarternarization.It reacts with sodium hydrogen telluride in ethano...1,3-dimethyl-2-substituted benzimidazolium salt can be easily prepared from carboxylic acid,o-phenylenediamine and methyl iodide via cyclization and quarternarization.It reacts with sodium hydrogen telluride in ethanol solution to produce 1,3-dimethyl-2-substituted benzimidazolidine.The reaction mechanism is discussed.Two benzimidazolidines are characterized by means of elemental analysis,IR and 1H NMR.Aldehydes are synthesized by hydrolysis reaction of the benzimidazolidines.Then,a novel synthetic method for aldehydes from the corresponding carboxylic acids via reduction-hydrolysis reaction of benzimidazolium salts is presented.The effect of 2-substituting group of benzimidazolium salts on the yield is discussed.展开更多
基金This work was financially supported by the National Natural Science Foundation of China （No. 21172172）, the Tianjin Natural Science Foundation （No. 11JCZDJC22000） and the Program for Innovative Research Team in University of Tianjin （No. TD12-5038）.
文摘Bis-benzimidazolium salt 1 was prepared via a series of reactions using 2,2＇-diphenol as starting material. Compound 2 was afforded through the intramolecular C--C coupling reaction of 1 under the catalysis of Pd（OAc）2. The structure of 2 is characterized through X-ray diffraction analyses, 1H NMR and 13C NMR. In 2, two boat-like seven-membered rings are contained, where the C--C bond distance newly formed is 1.461（5） A, and it is between regular C--C single bond （1.54 A） and C=C double bond （1.34 A）. This shows that new C--C bond has partial double-bond character. In the crystal packing of 2, the 2D supramolecular layers are formed via C--H..-F hydrogen bond.
基金Project supported by the Provincial Natural Science Foundation of Shaaxi Province
文摘A new synthetic method of ketones from substituted benzimidazolium salts and Grignard reagents is reported. The influences of the various Grignard reagents on the yield of ketones and the mechanism are discussed.
文摘Based on the one carbon unit transfer reaction of tetrahydrofolate coenzymes, hydratropic aldehyde was synthesized successfully by using benzimidazolium salt as tetrahydrofolate coenzyme model at formic acid oxidation level and Grignard reagent as a nucleophile to which one carbon unit was transfered. A novel method for the preparation of hydratropic aldehyde was provided. The mechanism for the addition hydrolysis reaction of benzimidazolium salt with Grignard reagent and the effects of reaction condition on the yield are discussed.
文摘The present paper covers a novel method for the preparation of α-naphthylacetone via the addition-hydrolysis reaction of a 2-（α-naphthylmethyl）benzimidazolium salt with Grignard reagent.The IR spectrum,MS and 1H NMR of the title compound are consistent with those reported.This method provides a convenient and inexpensive access to the title compound.The mechanism for the addition-hydrolysis reaction of benzimi-（dazolium） salt with Grignard reagent and the effects of reaction conditions on the yield are discussed.
基金supported by the National Natural Science Foundation of China(No.21172172)Tianjin Natural Science Foundation(No.11JCZDJC22000)the Program for Innovative Research Team in University of Tianjin(TD12-5038)
文摘The bis-benzimidazolium salt bis[2-（N-ethylbenzimidazoliumyl）ethyl]amine hexafluorophosphate（LH2·（PF6）2） and its N-heterocyclic carbene silver（Ⅰ） complex[L2Ag3]（PF6）3（1）have been prepared and characterized.In complex 1,a trinuclear silver（Ⅰ） architecture is formed by two tridentate ligands and three silver（I） atoms,in which one 12- and two 7-membered rings are contained.In the crystal packing of 1,1D chain and 2D supramolecular layer are formed via intermolecular weak interactions,including π…π interactions and C-H…π contacts.Additionally,the fluorescence emission spectra of LH2-（PF6）2 and 1 are described.
文摘N-丁基苯并咪唑与9,10-二(氯甲基)蒽在加热条件下反应生成氮杂环卡宾盐,接着与六氟磷酸钾进行阴离子交换,形成双(苯并咪唑-2-叶立德)蒽六氟磷酸盐配体1,再将配体1和氧化汞反应生成双(苯并咪唑-2-叶立德)蒽-汞(Ⅱ)配合物2。通过1 H NMR、13 C NMR和单晶衍射确定其分子结构,对配体1和配合物2的紫外和荧光性质进行了研究。
文摘1,3-dimethyl-2-substituted benzimidazolium salt can be easily prepared from carboxylic acid,o-phenylenediamine and methyl iodide via cyclization and quarternarization.It reacts with sodium hydrogen telluride in ethanol solution to produce 1,3-dimethyl-2-substituted benzimidazolidine.The reaction mechanism is discussed.Two benzimidazolidines are characterized by means of elemental analysis,IR and 1H NMR.Aldehydes are synthesized by hydrolysis reaction of the benzimidazolidines.Then,a novel synthetic method for aldehydes from the corresponding carboxylic acids via reduction-hydrolysis reaction of benzimidazolium salts is presented.The effect of 2-substituting group of benzimidazolium salts on the yield is discussed.
