The reaction of α, β-epoxyketones with methoxymethylenetriphenyl-phosphorane provides a method for the preparation of α-alkylsubstitutedγ-hydroxy-α, β-uns
A polysaccharide,PS(1),has been isolated from the pollen of papaver somniferum.PS(1)is ahighly branched arabinogalactan,which,mainly contains α—L—arabinofura
The properties of absorption spectra are presented and the linearcorrelations of Hammett constants with the 0-0 transition energy(E<sub>o,o</sub>)of S<sub>←</s