a) Draw the product of the reaction between chitosan and phthalic anhydride. b) Briefly explain the behaviour change in solubility of the starting material and the final product.

Introduction to General, Organic and Biochemistry
11th Edition
ISBN:9781285869759
Author:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres
Publisher:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres
Chapter21: Lipids
Section: Chapter Questions
Problem 21.26P
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Chitosan is derived from the shells of crustaceans. it is only soluble in an aqueous acidic medium but not in organic solvents. When reacted with phthalic anhydride, it forms an amide. The product is no longer soluble in the aqueous medium but now is soluble in organic solvents. 

a) Draw the product of the reaction between chitosan and phthalic anhydride.

b) Briefly explain the behaviour change in solubility of the starting material and the final product.

OH
R'-
HO
R"
NH2
chitosan
phthalic anhydride
Transcribed Image Text:OH R'- HO R" NH2 chitosan phthalic anhydride
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