نتایج جستجو برای: α
تعداد نتایج: 164959 فیلتر نتایج به سال:
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...
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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