Staggered conformation notation

Figure 2 Notation for staggered conformations +(6QO, +sc) a(180 , ap) and -(3000, -sc) based on the Klyne-Prelog (I960) description of conformation for single bonds.

Figure 2.6 The compound operation /C3 for ethane in the staggered conformation (a) using flying wedge notation (b) in the Newman projection.

Scheme 9. The threo 2,3-diol problem. The erythro/threo notation is based on Fischer projection formulas. For example, if threo 2,3-diol 28, shown here in a staggered zigzag conformation, was depicted in an eclipsed Fischer projection, the adjacent hydroxyls attached to carbons 2 and 3 would reside on opposite sides of the carbon chain. An alternative, perhaps less ambiguous, descriptor is the syn/anti notation.63...

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