ISSN:
0449-2951
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
High molecular weight polyacrolein reacts readily with a variety of aldehyde reagents to form soluble derivatives. The reactions proceed at a measureable rate at room temperature when suitably catalyzed by acid or base. Gentle warming is occasionally required to attain useful reaction rates. The reactions of polyacrolein are conveniently divided into those involving (a) the aldehyde function alone or (b) the active hydrogen alpha to the carbonyl. The first class includes reactions with HCN, NaHSO3 (SO2), Na2S2O4, primary and secondary amines, alcohols, thiols, and aqueous based. The second type reaction includes additions to the α-carbanion and oxidations involving chain scission. Depending on the reagent employed and conditions, reaction of polyacrolein gives open-chain derivatives or the 2,6-disubstituted tetrahydropyran structure which is present to a large extent in hydrated polyacrolein. Base-catalyzed disproportionation of polyacrolein yields a polymethylol polycarboxylic acid via internal Cannizzaro reaction. In the presence of formaldehyde, α-methylol groups are introduced during the disproportionation.
Additional Material:
2 Tab.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1965.100031012
Permalink