The cross sections of fragments produced in the 140 A MeV58,64Ni＋9 Be projectile fragmentation reactions are calculated by using the antisymmetrized molecular dynamics （AMD） model, the modified statistical abrasion...The cross sections of fragments produced in the 140 A MeV58,64Ni＋9 Be projectile fragmentation reactions are calculated by using the antisymmetrized molecular dynamics （AMD） model, the modified statistical abrasion- ablation （SAA） model, and the empirical EPAX2/EPAX3 formulae. The Gogny-gO interaction is taken as the effective nucleon-nucleon interaction in the AMD calculation, and the decays of fragments obtained from the AMD results are calculated by using the GEMINI code. The calculated cross sections of fragments are compared.展开更多
The stereoselective synthesis of substituted [2,2,1]-bicyclo- heptan-2-one 12,a supposed intermediate to the spiroketal fragment of azadi- rachtin was described.When 12 was treated with mCPBA in CH_2Cl_2 in the pres- ...The stereoselective synthesis of substituted [2,2,1]-bicyclo- heptan-2-one 12,a supposed intermediate to the spiroketal fragment of azadi- rachtin was described.When 12 was treated with mCPBA in CH_2Cl_2 in the pres- ence of excess amount of solid sodium bicarbonate,only 13 was obtained.The spiroketal intermediate 20 was converted from 9 through 5 steps by an alterna- tive route.展开更多
基金Supported by the Program for Science and Technology Innovation Talents in Universities of Henan Province under Grant No13HASTIT046
文摘The cross sections of fragments produced in the 140 A MeV58,64Ni＋9 Be projectile fragmentation reactions are calculated by using the antisymmetrized molecular dynamics （AMD） model, the modified statistical abrasion- ablation （SAA） model, and the empirical EPAX2/EPAX3 formulae. The Gogny-gO interaction is taken as the effective nucleon-nucleon interaction in the AMD calculation, and the decays of fragments obtained from the AMD results are calculated by using the GEMINI code. The calculated cross sections of fragments are compared.
文摘The stereoselective synthesis of substituted [2,2,1]-bicyclo- heptan-2-one 12,a supposed intermediate to the spiroketal fragment of azadi- rachtin was described.When 12 was treated with mCPBA in CH_2Cl_2 in the pres- ence of excess amount of solid sodium bicarbonate,only 13 was obtained.The spiroketal intermediate 20 was converted from 9 through 5 steps by an alterna- tive route.
