Linear repetition groups

To designate linear chain conformations in the crystalline state, the use of line repetition groups [7] is recommended. 

Resolution of tert-acetylenic alcohols. Brucine forms stable 1 1 molecular complexes with only one enantiomer of several terr-acetylenic alcohols. In some liivorublc eases, complete resolution can be achieved by only one complexation in oilier eases, repetition of complexation is necessary for complete resolution. The complexes are decomposed by dilute HC1. Complexation involves a hydrogen bond between the OH group and the N atom of brucine in addition, the linearity of the acetylene group may be involved.1... 

Figure 3.8 The cr-type group orbitals on the vertices of an O3 structure orbit exhibiting D31J point symmetry displayed on the elliptical projections of Figure 3.7. The circular icons, filled and open circles, identify cr-oriented orbital components at the vertices, sized to reflect the coefficients of the linear combinations, equation 3.20, for the spherical harmonics in Table 3.11. The icons and identify the distinct group orbitals transforming as the irreducible components of the reducible character over the decorated orbit, unnecessary repetitions of these components and central functions for which no group orbital can be constructed owing to the locations of the decorated vertices of the orbit in the Cartesian coordinate system.

Arabinofuranosyl donor 418 glycosylated acceptor 419, to yield after levulinyl-deprotection and repetitive glycosylation with 419, the linear trisaccharide 420 (O Scheme 67d). Coupling of latent BCB donor 422, with active CB donor 421, led after deprotection of the levulinyl groups to diol 423 (O Scheme 67b). The crucial double 8-arabinofuranosylation of diol 423... 

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