Abstract
A number of polymers and copolymers containing
β
-benzyl-L-aspartate has been prepared and their optical rotatory dispersion in a variety of solvents has been measured. The results of these measurements together with studies of infra-red spectra, X-ray diffraction patterns, deuteration rates and molecular models lead to the following conclusions. (i) The
α
-helical form of poly-
β
-benzyl-L-aspartate is considerably less stable relative to the solvated randomly coiled form than that of poly-
γ
-benzyl-L-glutamate. (ii) The left-handed
α
-helix of poly-
β
-benzyl-L-aspartate is more stable than the right-handed one. (iii) The difference in stability between the two senses of
α
-helix is much less in the case of poly-
β
-benzyl-L-aspartate than in that of poly-
γ
-benzyl-L-glutamate or poly-L-alanine.
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