ISSN:
0006-3525
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The NCAs of the N-benzyl derivatives of β-alanine, β-DL-aminobutyric acid, and β-DL-aminoisobutyric acid (nonplanar six-membered rings) were prepared by reacting the corresponding N-chloroformyl derivatives, obtained on reaction of the N-benzyl amino acids with phosgene, with triethylamine. Contrary to the others, the NCA of N-benzyl-β-alanine polymerized readily on heating in vacuo or in solution, using n-hexylamine or methanolic sodium methoxide as initiators. With n-hexylamine the molecular weights of the polymers obtained in benzene, dioxan, and dimethylsulfoxide, were in accordance with DP = [NCA]/[Initiator], as was found with conventional five-membered ring NCAs of α-amino acids. With sodium methoxide initiation, DPs of the polymers obtained were smaller than the (NCA)/[Initiator] ratio, contrary to what was found previously with α-amino acid NCAs. The possibility that stereochemical factors are responsible for the differences in polymerization activity of various. N-alkyl β as well as α amino acid NCAs is discussed.
Additional Material:
4 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/bip.1964.360020207
