Magnetic Resonance in Chemistry p. 511 - 517 (1988)
Update date:2022-08-05
Topics:
Redondo, Jordi
Sanchez-Ferrando, Francisco
Valls, Montserrat
Virgili, Albert
The 80 MHz 1H NMR and 20 MHz 13C NMR spectra of five 4-methylcoumarins, six 4-methyl-2(1H)-quinolones and nine 3-methylbenzofurans, including six new compounds, were fully assigned.Homonuclear 1H<1H> NOEs and selective heteronuclear 13C<1H> NOEs were measured after low-power pre-saturation of the methyl protons.Indirect, negative heteronuclear NOE enhancements were found in suitable three-spin systems of the 13C-1H-<1H> type, and their magnitude was found to be dependent on ring size.The first examples of indirect, heteronuclear NOE enhancements on non-protonated carbons are described.KEY WORDS Heteronuclear NOE Selective heteronuclear 13C<1H> NOE Indirect negative NOE 13C-1H-<1H> three-spin effects Coumarins 2(1H)-Quinolones Benzofurans.
View MoreHefei EnliPharma Tecnology Co.,Ltd
Contact:0086-551-66399836
Address:Qing Cheng ShuiXiang Building 805, Mengcheng North Road , ShuangFeng Economic Development Zone Anhui HeFei
YingYing Pharmaceutical Co.,Ltd
Contact:86-18854126208
Address:55#, yingxiongshan road
Shijiazhuang Haitian Amino Acid Co., Ltd.
Contact:+86-311-88908111
Address:Shijiazhuang Hebei province,China
Shanghai Harvest Chemical Ind. Co., Ltd.
Contact:021-51385350
Address:ROOM 806-807, AI LI CHEN BUILDING, No.333 JINGXIANG ROAD, PUDONG DISTRICT, 201206, SHANGHAI
qingdao goldenchem imp and exp co.,ltd.
Contact:532-55579246
Address:no.62 ,haier road laoshan distirct
Doi:10.1021/ja906878q
(2009)Doi:10.1002/asia.200800429
(2009)Doi:10.1016/j.tetlet.2009.08.031
(2009)Doi:10.1021/jo901712x
(2009)Doi:10.1039/b906769h
(2009)Doi:10.1021/acs.orglett.6b01672
(2016)
