《Influence of substituent and push-pull effect on the chemical shifts of the carbon in bridging bond of 1-furyl/thienyl-2-arylethylene》 was written by Cao, Chao-tun; Yan, Lu; Cao, Chenzhong; Qu, Junyan. SDS of cas: 620-20-2 And the article was included in Journal of Physical Organic Chemistry on April 30 ,2021. The article conveys some information:
Sixty-six samples of 1-furyl/thienyl-2-arylethylene model compounds XCH=CHArY (abbreviated XEBY) were synthesized. The NMR spectra (NMR) of model compounds were determined The chem. shift δC(X) and δC(Y) of the carbon atoms in bridging bond CH=CH which connected to the X group and the ArY group, resp., were confirmed with the two-dimensional NMR method. The effect of substituent on the δC(X) and δC(Y) was studied, meanwhile, the push-pull effect of substituent on ΔδC = δC(Y) – δC(X) and δC(Y/X) = δC(Y)/δC(X) were discussed. The results show the following: (a) Both the δC(X) and δC(Y) are affected by excited-state substituent constant σCCexX of group X, Hammett constant σ(Y), and excited-state substituent constantσCCexY of group Y. The effect of σ(Y) on the δC(X) is pos., whereas that on the δC(Y) is neg. That is to say, the σ(Y) of group Y has an alternative influence on the δC(X) and δC(Y). (b) Compared with furyl, there is a p-d effect formed by the 3d orbit of S atom and the p electron of the π system in thienyl, which increase the chem. shift of the carbon atoms in bridging bond. (c) The push-pull effect between substituent X and Y is not only affected by the σ parameter but also related to the σCCex parameter, which results from the combined effect of the two parameters σ and σCCex. The observation of this paper provides a new perspective in understanding the push-pull effect of substituent. In the experiment, the researchers used 3-Chlorobenzylchloride(cas: 620-20-2SDS of cas: 620-20-2)
3-Chlorobenzylchloride(cas: 620-20-2) has been used in the reaction of 3-methoxybenzyl chloride and ethyl 4-bromobenzoate in pure water, using zinc dust and a Pd catalyst.SDS of cas: 620-20-2
Referemce:
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