期刊
OPEN CHEMISTRY
卷 16, 期 1, 页码 79-86出版社
DE GRUYTER POLAND SP ZOO
DOI: 10.1515/chem-2018-0009
关键词
photocyclization; substituent effect; 1,4-biradical; angular pentacyclics; chromenones; benzothiophene; photoirradiation
资金
- University Grants commission (UGC), New Delhi
- Department of Science and Technology, New Delhi
The effect on photochemical transformations of the substituents present remotely from the reaction site in 3-benzyloxy-2-(benzo[b]thiophen-2-yl)-4H-chromen-4-ones has been determined. The structure(s) of the substrates and photoproducts were established by spectroscopic techniques (UV, IR, and NMR). The substituents had profound effects on product yield and distribution. Electron withdrawing groups (EWGs) on the benzenoid moiety of the chromenone nucleus increased the yield of the photoproducts whereas electron donating groups (EDGs) decreased the yield. These results may be attributed to state switching of the substituents during excitation.
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