Enantio- and periselective nitroalkene Diels–Alder reaction
作者:Maurice J. Narcis、Daniel J. Sprague、Burjor Captain、Norito Takenaka
DOI:10.1039/c2ob26674a
日期:——
The periselective DielsâAlder reaction of 5-substituted pentamethylcyclopentadienes and nitroethylene has been realized by helicalâchiral hydrogen bond donor catalysts. To our knowledge, this represents the first asymmetric catalytic nitroalkene DielsâAlder reaction via activation of nitroalkene, and thus establishes its proof-of-principle.
Synthesis and Reactions of Novel Triply Thiolate-Bridged Diiron Complexes [Cp*Fe(μ<sub>2</sub>-SR)<sub>3</sub>FeCp*] (Cp* = η<sup>5</sup>-C<sub>5</sub>Me<sub>5</sub>; R = Et, Ph)
作者:Yanhui Chen、Yuhan Zhou、Jingping Qu
DOI:10.1021/om0611148
日期:2008.2.1
The novel thiolate-bridged diiron complexes [Cp*Fe(mu(2)-SR)(3)FeCp*] (1, R = Et; 2, R = Ph) have been obtained by the reaction of [Cp*FeCl](2) with LiSEt or LiSPh in THF. Treatment of 1 with CO or (CNBu)-Bu-t in THF gives complex [Cp*FeSEt(mu(2)-SEt)(2)FeCp*CO] (3) or [Cp*FeSEt(mu(2)-SEt)(2)FeCp*(CNBu)-Bu-t] (4), while reaction of 1 with (CNBu)-Bu-t in CH2Cl2 results in the formation of complex [Cl2Fe(mu(2)-SEt)(2)FeCp*(CNBu)-Bu-t] (5). These five complexes have been spectroscopically and crystallographically characterized. In addition, the formation of 5 indicates that this class of clusters might serve as carbon-halogen bond activation reagents (catalysts), and carbon-halogen bond cleavage reaction of 4 is also described.
FINKE, R. G.;KEENAN, S. R.;SCHIRALDI, D. A.;WATSON, P. L., ORGANOMETALLICS, 1986, 5, N 3, 598-601
作者:FINKE, R. G.、KEENAN, S. R.、SCHIRALDI, D. A.、WATSON, P. L.
DOI:——
日期:——
A novel synthetic route to pentaalkylcyclopentadienylgallium(I) compounds
作者:Peter Jutzi、Lars Oliver Schebaum
DOI:10.1016/s0022-328x(02)01429-8
日期:2002.7
The reaction of ‘GaI’ with potassium cyclopentadienides allows a simple access to cyclopentadienylgallium(I)-complexes. Thus, the compounds Me5C5Ga 1 and Me4EtC5Ga 2 have been prepared in high yields. Performing the synthesis of ‘GaI’ under ultrasonic conditions not in toluene but in benzene as solvent, avoids the formation of benzyl iodide as side product.
“ GaI”与环戊二烯化钾的反应允许简单地获得环戊二烯基镓(I)-络合物。因此,已经以高收率制备了化合物Me 5 C 5 Ga 1和Me 4 EtC 5 Ga 2。在超声波条件下而不是在甲苯中而是在作为溶剂的苯中进行“ GaI”的合成,可以避免形成苄基碘作为副产物。