Gauche linkages

Fig. 5. A section of an -alkyl chain in an diW-trans conformation together with trans and gauche linkages shown as Newman projections.

In its simplest form the rotational isomeric state model gives the internal energy of an Ai-alkyl chain with gauche linkages as ... 

P212121 Z = 4 D, = 1.413 R = 0.041 for 3,165 intensities. Thepyran-oside conformation is 4C1, with Q = 58 pm, 6 = 5°. The primary alcohol group is gauche-trans. The linkage-bond torsion-angles are O-5-C-l-0-1 -C-7 = — 87°, C-1-0-1-C-7-0-7 = — 67°. The two rings of the monoterpene moiety are inclined to each other, with C-C-C-C torsion-angles, about the common bond, of 149 and —97°. 

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