Influence of the side-group at C=N bridging bond of bis-aryl Schiff bases on the wavelength of absorption maximum of ultraviolet absorption spectra
作者:Qingqing Luo、Chao-Tun Cao、Zhongzhong Cao、Chenzhong Cao
DOI:10.1002/poc.3550
日期:2016.8
methyl CH3 at carbon end and the CH=N(O) has a side‐group O atom at nitrogen end. In this work, a series of XPEAY and XPNY were synthesized, and their longest wavelength maximum λmax (nm) of ultravioletabsorptionspectra were measured. Then the change regularity of the νmax (cm‐1, νmax=1/λmax) of XPEAY and XPNY were investigated, and they were compared with that of XBAY (reported by ref.26). The results
Synthesis of Benzimidazolones via One-Pot Reaction of Hydroxylamines, Aldehydes, and Trimethylsilyl Cyanide Promoted by Diacetoxyiodobenzene
作者:Huaiyuan Zhang、Danfeng Huang、Ke-Hu Wang、Jun Li、Yingpeng Su、Yulai Hu
DOI:10.1021/acs.joc.6b02781
日期:2017.2.3
A novel and efficient PhI(OAc)2-promoted one-pot reaction of aromatic hydroxylamines, aldehydes, and TMSCN in the presence of BF3·Et2O is described. A wide variety of N-substituted benzimidazolones are obtained with satisfactory yields under mild reaction conditions. The method was proven to be efficient for the synthesis of benzimidazolone derivatives from readily available starting materials.
Remarkable Stereocontrol in 1,3-Dipolar Cycloaddition of Acyclic Nitrones: Investigation of the Cycloaddition of <i>C,N</i>-Diaryl Nitrones to Methyl Cinnamate Under Different Reaction Conditions
作者:Pizush Kanti Biswas、Debasish Bandyopadhyay、Thierry Prangé、Alain Neuman、Avijit Banerji
DOI:10.1080/00397911003797858
日期:2011.3.28
Abstract Investigation of the cycloaddition of C,N-diarylnitrones to methyl cinnamate under different reaction conditions were carried out. Two diastereoisomeric and one regioisomeric cycloadducts were isolated and characterized by spectroscopic and x-ray data. Remarkable change in selectivity was noticed in solvent-free condition and in the presence of ytterbium triflate as catalyst.
摘要 研究了C,N-二芳基硝酮在不同反应条件下环加成制肉桂酸甲酯的反应。分离出两种非对映异构体和一种区域异构体环加合物,并通过光谱和 X 射线数据表征。在无溶剂条件下和在三氟甲磺酸镱作为催化剂的情况下注意到选择性的显着变化。