Determination of the Absolute Configuration of Chiral Secondary Alcohols from Tetra-O-acetylglucosidation-Induced 1H Nuclear Magnetic Resonance Shifts
Tetra-O-acetylglucosidation-induced 1H nuclear magnetic resonance shifts were found highly characteristic of the absolute configuration of representative examples of R and S chiral secondary alcohols.The most important chemical shift changes of structurally diagnostic value for the determination of the absolute configuration of alcohols concern the protons of the aglycone attached to the carbons at β-position relative to the oxygen atom.
Faghih, Ramine,Fontaine, Catherine,Horibe, Isao,Immamura, Paulo M.,Lukacs, Gabor,et al.
3-EPI-CYCLOLAUDENOL AND KNOWN TRITERPENES FROM EUPHORBIA CAUDICIFOLIA
A new tetracyclic triterpene, 3-epi-cyclolaudenol (24-methyl-9,19-cyclolanost-25-en-3α-ol), cyclolaudenol and cycloartenol were isolated from the ethanolic extract of the latex of Euphorbia caudicifolia, and cycloartenol and 3-ketomethylursolate were obtained from the ethanolic extract of the stem of this plant. - Keywords: Euphorbia caudicifolia; Euphorbiaceae; latex; stem; tetracyclic triterpenes; pentacyclic triterpenes; 3-epi-cyclolaudenol; cyclolaudenol; cycloartenol; 3-ketomethylursolate.
Govardhan, Ch.,Prasad Reddy, R.,Sundararamaiah, T.
p. 411 - 414
(2007/10/02)
More Articles about upstream products of 2315-13-1