نتایج جستجو برای: α

تعداد نتایج: 164959  

Journal: :Epj Web of Conferences 2022

Helium( 4 He, or α)is the second most abundant element in observable Universe. The α-particle induced reactions such as(α, γ), (α, n) and p) play a crucial role nuclear astrophysics, especially for understanding stellar heliumburning. Because of strong Coulomb repulsion, it is greatly hindered to directly measure cross sections these α-capture at energies. Alpha-cluster transfer reaction powerf...

Journal: :Progress of Theoretical Physics 1967

Journal: :Berichte der deutschen chemischen Gesellschaft 1900

Journal: :Berichte der deutschen chemischen Gesellschaft 1890

Journal: :NIPPON KAGAKU KAISHI 1943

Journal: :Justus Liebig's Annalen der Chemie 1888

Journal: :Berichte der deutschen chemischen Gesellschaft (A and B Series) 1919

2014
John M. Curto Joshua S. Dickstein Simon Berritt Marisa C. Kozlowski

The first asymmetric synthesis of α-allyl-α-aryl α-amino acids by means of a three-component coupling of α-iminoesters, Grignard reagents, and cinnamyl acetate is reported. Notably, the enolate from the tandem process provides a much higher level of reactivity and selectivity than the same enolate generated via direct deprotonation, presumably due to differences in the solvation/aggregation sta...

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