The compounds N-(benzylidene)-anilines XArCH=NArY (XBAY), N-(phenyl-ethylene)-anilines XArC(CH 3 )=NArY (XPEAY) and N-phenyl-α-phenylnitrones XArCH=N(O)ArY (XPNY) have bridging group CH=N, C(CH 3 )=N and CH=N(O) respectively, in which the C(CH 3 )=N has a side-group methyl CH 3 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 λ max (nm) of ultraviolet absorption spectra were measured. Then the change regularity of the ν max (cm -1 , ν max =1/λ max ) of XPEAY and XPNY were investigated, and they were compared with that of XBAY (reported by ref.26). The results indicate: (1) There are no good linear relationships between the ν max of XBAYs and XPEAYs or XPNYs. (2) In case of a same set of X-Y group couples, the distribution of λ max of XPEAYs is larger than that of XPNYs. (3) The side-group CH 3 makes the effect of σ(X) larger than that of σ(Y) on the ν max of XPEAYs, whereas the O atom makes the effect of σ(Y) larger than that of σ(X) on the ν max of XPNYs. (4) The cross-interaction between X and Y has important effect on the all ν max . However, the cross-interaction between CH 3 and X/Y has not important effect on the ν max of XPEAY, and the cross-interaction between O and X/Y has not important effect on the ν max of XPNY.
A Cu‐catalyzed C−H cyclization of simple anilines with ketones and DMSO as a one‐carbon source has been developed. Using an aerobic oxidative protocol, a number of ketones and anilines could be easily converted to 2‐arylquinolines, rather than 4‐arylquinolines, thus providing a highly atom‐economical and simple approach to biologically significant 2‐arylquinolines. Based on the preliminary experiments, a plausible mechanism is proposed.magnified image
Silver nanowires (Ag NWs) are promising building blocks for next-generation flexible transparent conductors (TCs). However, the current industrial synthesis method for Ag NWs, i.e., polyol reduction method, readily produces abundant...
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