On the basis of analyzing the current development situation of basil cooperative in Pengshui County of Chongqing Municipality,we use the questionnaire survey and case study method to analyze the participation mode,par...On the basis of analyzing the current development situation of basil cooperative in Pengshui County of Chongqing Municipality,we use the questionnaire survey and case study method to analyze the participation mode,participation motivation and satisfaction of specialized cooperative members. Through the in-depth interviews with farmers,we sum up the existing problems in the cooperative members,specialized cooperatives and external environment,and bring forward the corresponding recommendations.展开更多
Coupling reaction of 4-chloro-7-H-pyrrolo[2,3-d]pyrimidine with 2,3,5-tri-O-acetyl -β-D-ribofuranosyl chloride under the basic condition was investigated. An abnormal coupling reaction, in which the heterocyclic base...Coupling reaction of 4-chloro-7-H-pyrrolo[2,3-d]pyrimidine with 2,3,5-tri-O-acetyl -β-D-ribofuranosyl chloride under the basic condition was investigated. An abnormal coupling reaction, in which the heterocyclic base attacked at the carbon of 1,2-O-methylidene moiety instead of anomeric carbon of ribose was observed and the structure of products 5a, 5b were identified by NMR and X-Ray diffraction.展开更多
文摘On the basis of analyzing the current development situation of basil cooperative in Pengshui County of Chongqing Municipality,we use the questionnaire survey and case study method to analyze the participation mode,participation motivation and satisfaction of specialized cooperative members. Through the in-depth interviews with farmers,we sum up the existing problems in the cooperative members,specialized cooperatives and external environment,and bring forward the corresponding recommendations.
基金This work was supported by the National Natural Science Foundation of China.
文摘Coupling reaction of 4-chloro-7-H-pyrrolo[2,3-d]pyrimidine with 2,3,5-tri-O-acetyl -β-D-ribofuranosyl chloride under the basic condition was investigated. An abnormal coupling reaction, in which the heterocyclic base attacked at the carbon of 1,2-O-methylidene moiety instead of anomeric carbon of ribose was observed and the structure of products 5a, 5b were identified by NMR and X-Ray diffraction.
