Journal of the Chemical Society. Perkin transactions I p. 1213 - 1219 (1981)
Update date:2022-08-03
Topics:
Botha, Jacobus J.
Young, Desmond A.
Ferreira, Daneel
Roux, David G.
Stereoselective and also stereospecific condensation at C-4 of flavan-3,4-diols of known absolute configuration with phloroglucinol and resorcinol in acid medium proceeds at ambient temperatures with partial retention of configuration for 2,3-trans-isomers and with inversion for 2,3-cis-analogues.Circular dichroism spectra of the resultant 4-arylflavan-3-ols all exhibit multiple Cotton effects.The sign of high intensity Cotton effects to low wavelength, contributed by aryl chromophores at C-4, may almost invariably be correlated with the absolute configuration at this chiral centre of 2,3-trans-3,4-trans, 2,3-trans-3,4-cis, and 2,3-cis-3,4-trans-isomers.
View MoreContact:86-513-84128750/13773795976
Address:No.48.Youyi West Road ,Rudong Development Zone,Jiangsu Province,China
Naturalin Bio-Resource Co., Ltd
website:http://www.naturalin.com
Contact:+86-0731-84430651
Address:B1-402, Lu-Valley Enterprise Square.No.27 Wenxuan Road. Lu-Valley Hi-Tech District.
ALPHA PHARMACEUTICAL CO,LTD JIANGSU
Contact:+86-527-84829968,+86-527-84829998
Address:suqian city
Changzhou Qidi Chemical Co., Ltd
website:http://www.czqdhg.com/
Contact:86-519-83382137
Address:128-1-16# HuaYuan Street,Hutang Town,Wujin District,Changzhou City,P.R.China.
Contact:+91 9963263336
Address:Plot#146A, IDA Mallapur, Hyderabad - 500072
Doi:10.1016/S0040-4020(01)90891-9
(1983)Doi:10.1007/BF00906054
(1978)Doi:10.1039/c39780000585
(1978)Doi:10.1016/j.ejmech.2013.08.052
(2013)Doi:10.1039/b314356b
(2004)Doi:10.1055/s-0035-1561597
(2016)