Glycoside endo-trans

This enzyme is also known as trans-elimi-nase it splits the glycosidic bonds of a glu-curonide chain by trans elimination of hydrogen from the 4- and 5-positions of the glucuronide moiety. The reaction pattern is presented in Figure 10-8. The glycosidic bonds in pectin are highly susceptible to this reaction. The pectin lyases are of the endo-type and are obtained exclusively from fila-... 

An efficient synthesis of 4-methylphenyl 1,2-trans-l-thioglycopyranosides has involved isomerization of a mixture of the peracetylated endo- and exo-l,2-thio-orthoesters with deactivated Raney nickel and a trace of 4-methylthiophenol in toluene.1,2,3,5-Tetra-O-acetyl-P-D-ribofuranose reacted with thiophenol in the presence of tin(iv) chloride to give a mixture of S-glycosides containing principally phenyl 2,3,5-tri-O-acetyl-l-thio-p-D-ribofuranoside. ... 

---