reaction of substituted phenylketenes with diethylamine in acetonitrile were suggested to be the amideenols rather than the zwitterions on the basis of the theoretical calculations. A single broad band at 1674 cm−1 observed for reaction with the primary amines was attributed to overlap of two bands of the intermediate (amideenol) and the final product (amide). The substituenteffect for the second‐order
Lewis acid catalyzed reactivity switch: pseudo three-component annulation of nitrosoarenes and (epoxy)styrenes
作者:Anisha Purkait、Subhajit Saha、Santanu Ghosh、Chandan K. Jana
DOI:10.1039/d0cc02650f
日期:——
Lewis acid catalyzed alteration of annulation pattern allowed formation of arylquinolines via C–H functionalization of nitrosoarenes and C–C cleavage of (epoxy)styrene.
The asymmetric stretching frequencies of the ketene group of the m,p-substituted phenylketenes were found to be correlated with σ. The substituent effects for the second-order rate constants of phe...
solid samples of complexes 3a–3d show orange light at 298 K. The anion binding properties of complexes 3a–3d have been studied by UV-vis titration experiments in CH3CN and DMSO. In general, the log K values of 3a–3d with the same anion in CH3CN depend on the substituent R on the acetylide ligand of 3a–3d and follow this order: R = NO2 (3d) > CF3 (3c) > Cl (3b) > H (3a). For the same complex with different
新型的具有脲基的乙炔铂(II)络合物[Pt(t Bu 3 tpy)(C CC 6 H 4 -4-NHC(O)NHC 6 H 4 -4-R)](OTf)(t Bu 3 tpy = 4,4',4''-三叔丁基-2,2':6',2''-叔吡啶; R = H(3a),Cl(3b),CF 3(3c) ,和NO 2(3d)),已经合成并表征。3a,3a · DMF·THF,3b ·的晶体结构通过X射线衍射测定了CH 3 CN和3c · CH 3 CN。在λ > 380 nm处激发后,配合物3a–3d的固体样品在298 K处显示橙色光。已经通过CH 3 CN和DMSO中的UV-vis滴定实验研究了配合物3a–3d的阴离子结合特性。通常,在CH 3 CN中具有相同阴离子的3a-3d的log K值取决于3a-3d乙炔配体上的取代基R并遵循以下顺序:R = NO 2(3d)> CF 3(3c)> Cl(3b)>
Ring transformation of 1,5-diazabicyclo[3.1.0]hexanes under the action of arylketenes
作者:Alexander V. Shevtsov、Vladimir V. Kuznetsov、Alexander A. Kislukhin、Vera Yu. Petukhova、Yu. A. Strelenko、Nina N. Makhova、Konstantin A. Lyssenko
DOI:10.1002/jhet.5570430411
日期:2006.7
instead of the expected bicyclic systems 1,5-diazabicyclo[3.2.1]octan-6-one 9 and 3-aryl-1,5-diazabicyclo[3.3.0]octane-2-one 10. The synthesis of two representatives of bicycles 10 (10a,b) proceeded in the reaction of unsubstituted 1,5-diazabicycle[3.1.0]hexane 8a, accordingly, with diphenylketene 1a in benzene at 20 °C and with 4-chlorophenylketene 1b in toluene at 60-110 °C. Mechanisms of the studied transformations