As an exploration of synthesizing gallotannins,the natural products with versatile biological activities 3 o galloyl D glucose (7) was prepared from gallic acid (1) and D glucose (3).The phenol hydroxyl groups of gallic acid were protected by benzylation which was cleaved subsequently by 10% palladised charcoal,and the four hydroxyl groups (1,2,4,6 ) of glucose shielded by isopropylation followed by acid hydrolysis.The structure was elucidated from the data of thin layer chromatography(TLC) and NMR spectrum.
A new type of high exhaustion chrome tanning technology, high pH chrome tanning method combined with LL-I glyoxylic acid assistant agent,applied to pig garment leather.
