以L-色氨酸甲酯盐酸盐为起始原料,与醛发生Pictet-Spengler反应得到四氢-β-咔啉,然后通过结晶诱导不对称转化(CIAT)过程得到单一对映体,再经Schotten-Baumann反应,酰胺形成及脱保护过程即得目标产物,结构经GC-MS,LC-MS,IR,1 H NMR,13C ...以L-色氨酸甲酯盐酸盐为起始原料,与醛发生Pictet-Spengler反应得到四氢-β-咔啉,然后通过结晶诱导不对称转化(CIAT)过程得到单一对映体,再经Schotten-Baumann反应,酰胺形成及脱保护过程即得目标产物,结构经GC-MS,LC-MS,IR,1 H NMR,13C NMR确证,总收率80%。展开更多
The semileptonic decays B＋c → P（V） ＋ l＋ ＋ vt and the nonleptonic decays B＋c → P（V） ＋ L, where P（V） denotes a pseudoscalar （vector） charmonium or （bs）-meson, and L denotes a light meson, are studied i...The semileptonic decays B＋c → P（V） ＋ l＋ ＋ vt and the nonleptonic decays B＋c → P（V） ＋ L, where P（V） denotes a pseudoscalar （vector） charmonium or （bs）-meson, and L denotes a light meson, are studied in the framework of improved instantaneous Bethe- Salpeter （BS） equation and the Mandelstam formula. The numerical results （width and branching ratio of the decays） are presented in tables, and in order to compare conveniently, those obtained by other approaches are also put in the relevant tables. Based on the fact that the ratio BR（B＋c→ψ（2S）π＋）/BR（B＋c→J/ψπ＋）=0.24^＋0.023_-0.040 estimated here is in good agreement with the observation by LHCb BR（B＋c→ψ（2S）π＋）/BR（B＋c→J/ψπ＋）=0.250 ± 0.068（stat） ± 0.014（syst） ± 0.006（B）, one may conclude that with respect to the decays the present framework works quite well.展开更多
From Bethe-Salpeter equation,we deduce the equation which describes the two-body system consisting of a scalar meson and a vector meson.This equation is applied to investigate the exotic narrow state X (3872) assumed ...From Bethe-Salpeter equation,we deduce the equation which describes the two-body system consisting of a scalar meson and a vector meson.This equation is applied to investigate the exotic narrow state X (3872) assumed as a molecule state composed of D 0 0.The contribution of the resonance 0 is the attractive interaction between two heavy mesons in this molecule state.The calculated mass of X is consistent with the experimental data.展开更多
文摘以L-色氨酸甲酯盐酸盐为起始原料,与醛发生Pictet-Spengler反应得到四氢-β-咔啉,然后通过结晶诱导不对称转化(CIAT)过程得到单一对映体,再经Schotten-Baumann反应,酰胺形成及脱保护过程即得目标产物,结构经GC-MS,LC-MS,IR,1 H NMR,13C NMR确证,总收率80%。
文摘2004年10月7日和12日美国假声男高音迈克尔马尼亚奇(Michael Maniaci)先后在中山音乐堂、上海音乐厅举办的"奇妙的和谐"音乐会,并受"第七届北京国际音乐节"组委会之邀,于2004年10月20日在保利剧院参演由英国指挥家菲利普皮克特(Philip Pickett)执棒新伦敦乐团(New London Consort)上演的蒙特威尔第的五幕歌剧《奥菲欧》。
基金supported by the National Natural Science Foundation of China(Grant Nos.11175051,11275243 and 11147001)the Fundamental Research Funds for the Central Universities and partially Program for Innovation Research of Science in Harbin Institute of Technology
文摘The semileptonic decays B＋c → P（V） ＋ l＋ ＋ vt and the nonleptonic decays B＋c → P（V） ＋ L, where P（V） denotes a pseudoscalar （vector） charmonium or （bs）-meson, and L denotes a light meson, are studied in the framework of improved instantaneous Bethe- Salpeter （BS） equation and the Mandelstam formula. The numerical results （width and branching ratio of the decays） are presented in tables, and in order to compare conveniently, those obtained by other approaches are also put in the relevant tables. Based on the fact that the ratio BR（B＋c→ψ（2S）π＋）/BR（B＋c→J/ψπ＋）=0.24^＋0.023_-0.040 estimated here is in good agreement with the observation by LHCb BR（B＋c→ψ（2S）π＋）/BR（B＋c→J/ψπ＋）=0.250 ± 0.068（stat） ± 0.014（syst） ± 0.006（B）, one may conclude that with respect to the decays the present framework works quite well.
文摘From Bethe-Salpeter equation,we deduce the equation which describes the two-body system consisting of a scalar meson and a vector meson.This equation is applied to investigate the exotic narrow state X (3872) assumed as a molecule state composed of D 0 0.The contribution of the resonance 0 is the attractive interaction between two heavy mesons in this molecule state.The calculated mass of X is consistent with the experimental data.
