16.1.5 GlycosidesCHOHOHHOH2C0HHOCH,OHHOHCIHOHOHOHOHH-OHCH2OHHOH2CHOH,CCCHOHOOCH3HOHOOHOHOCH3methyl α-D-(+)-glucopyranosidemethylβ-D-(+)-glucopyranosidemp165℃,[αl.25=+158°mp 107℃,[αl25=-33
16.1.5 Glycosides O HO HO OH HOH2C OCH3 CHO H OH HO H H OH CH2OH H OH O HO HO OH HOH2C OH CH3 OH HCl O HO HO OH HOH2C OCH3 methyl -D-(+)-glucopyranoside methyl -D-(+)-glucopyranoside mp 165℃,[ ]D 25=+158° mp 107 ℃, [ ]D 25=-33 °
HOH2CHOH2CO+H+0+H,0HOHOOHOH2-H+HOHO-H.0OHOHHOH,CH01HOOCH3HOH,CHO福OHHOF CH3OHHOHOH,C0OHHOHOH-OCH3+
O HO HO OH HOH2 C O HO HO OH HOH2 C OH +H+ -H+ O HO HO OH HOH2 C OH2 +H2 O -H2 O CH3OH O HO HO OH HOH2 C OCH3 H O HO HO HOH2 C H OCH3
HOH,CCHOHHOHO-OH
O HO HO OH HOH2 C O CH2 OH
Otherreactions16.1.616.1.6.1 enolization, tautomerism andisomerism
16.1.6 Other reactions 16.1.6.1 enolization, tautomerism and isomerism
HHHPC=0C=0COC=0-OHOH?-OHHOPHHH20OHHOHHHOHHOH→HOOH-HOH-HOHOHH--OHOHHHHHH-OH-OH-OH-OHCH,OHCH,OHCH,OHCH,OH烯醇负离子D-葡萄糖D-甘露糖OH-1H20HHH-C--OH单糖的异构化现象-OH福1C=0-OHC互变异构HOHHOHHOHHOHHOHH--OHCH,OHCH.OHD-果糖烯二醇
C O H H OH HO H H OH CH2OH H OH C O C H OH HO H H OH CH2OH H OH OHH2O C C H OH HO H H OH CH2OH H OH O - OHH2O C O H HO H HO H H OH CH2OH H OH D-葡萄糖 烯醇负离子 D-甘露糖 烯二醇 D-果糖 OH- H2O C C H OH HO H H OH CH2OH H OH OH C H H OH C O HO H H OH CH2OH H OH 互变异构 ⚫ 单糖的异构化现象