反应 #56009

ord-d06364d58a3942d68d5dd882b80eecd0

反应方程式

CO[C@@H]1O[C@H](CO)[C@@H](O)[C@H](O)[C@H]1O
methyl-beta-D-glucopyranoside
O=C[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO
dextrose
→
CO[C@H]1O[C@H](CO)[C@@H](O)[C@H](O)[C@H]1O
methyl-alpha-D-glucopyranoside
收率 79.0%

反应物

—
polyglycosides
CO[C@@H]1O[C@H](CO)[C@@H](O)[C@H](O)[C@H]1O
methyl-beta-D-glucopyranoside
O=C[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO
dextrose

试剂

无

反应条件

详细条件
See reaction.notes.procedure_details.

实验过程

In the above Table I, it can be seen tht Sample A product composition gave a yield of 79.0% methyl-alpha-D-glucopyranoside and methyl-beta-D-glucopyranoside, and only 10.81% of polyglycosides and dextrose. Sample D produced 77.12% methyl-alpha-D-glucopyranoside and methyl-beta-D-glucopyranoside, while Sample G produced only 71.55% of the glucosides. At the same time, the percentages of polyglycosides and dextrose increased as the methanol:starch ratio decreased. The cost of removal of excess methanol must be balanced against the slightly increased yield of glucosides.

来源

DOI: 10.6084/m9.figshare.5104873.v1专利: US04223129uspto-grants-1980_09