Nickel-Catalyzed Alkylation and Transfer Hydrogenation of α,β-Unsaturated Enones with Methanol
作者:Nahury Castellanos-Blanco、Marcos Flores-Alamo、Juventino J. García
DOI:10.1021/om2010222
日期:2012.1.23
allowed the selective reduction of C═C bonds in α,β-unsaturated enones to yield enones and saturated ketones by a homogeneous catalytic pathway, whereas by a heterogeneous pathway, the process leads to the formation of mono- and dimethylated ketones. In the latter case, the occurrence of nickel nanoparticles in the reaction media was found to participate in the catalytic alkylation of such dienones.
该类型的复合物[(dippe)的Ni} Ñ(η 2 -C α,C β -1,4-二烯-3-酮)](dippe = 1,2-双(二异丙基)乙烷); n = 1,2;合成烯酮=芳族1,4-戊二烯-3-酮。在“[(dippe)的Ni]”部分从[(dippe)的Ni(μ-H)]衍生的2 η 2配位的到C,C双重相应α的键,β不饱和烯酮与被完全表征使用各种光谱技术,例如单晶X射线衍射,核磁共振(NMR)和质谱。使用甲醇(CH 3OH)作为氢供体。在纯净条件下,该醇被证明是1,4-戊二烯-3-酮的非常有效的还原和烷基化剂。当前的方法允许通过均相催化途径选择性还原α,β-不饱和烯酮中的C═C键以产生烯酮和饱和酮,而通过非均相途径,该过程导致单和二甲基化酮的形成。在后一种情况下,发现在反应介质中镍纳米颗粒的存在参与了这种二烯酮的催化烷基化。