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• W1991715572 abstract "The molecular and crystal structure of naturally occurring optically active poly(β-hydroxy-butyrate) was analysed by X-ray diffraction. The unit cell is orthorhombic, P212121-D42, with a = 5·76 Å, b = 13·20 Å, and c(fibre period)=5·96 Å and two molecules pass through the unit cell. The molecule has a conformation shown by the Fischer projection for the case of a rectus polymer, giving a left-handed (21) helix. The crystalline synthesized racemic polymer gave the same X-ray diffraction pattern as the naturally occurring optically active polymer. This result indicates that the racemic polymer has an isotactic configuration and consists of two kinds of crystallites, each composed only of the left-handed helices of rectus polymer chains, or only of the right-handed helices of sinister polymer chains." @default.
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• W1991715572 date "1973-06-01" @default.
• W1991715572 modified "2023-10-18" @default.
• W1991715572 title "Structural studies of polyesters: 5. Molecular and crystal structures of optically active and racemic poly (β-hydroxybutyrate)" @default.
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• W1991715572 doi "https://doi.org/10.1016/0032-3861(73)90087-6" @default.
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