Diequatorial pyranosides

Figure 4.33 Key conformational motif in 1,4-diequatorial pyranosides. Shown in both conformational and Mills representations.

Neighbouring diaxial protons of cyclohexane can be clearly identified by their large coupling constants 11-13 Hz, Table 2.10) which contrast with those of protons in diequatorial or axial-equatorial configurations ( Jee 2-4 Hz). Similar relationships hold for pyranosides as oxy-... 

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