Syn/anti convention

Keeping the foregoing limitations in mind, we will discuss the recently published methods for achieving carbon chain elongation. Throughout this chapter, the syn—anti convention, as proposed Masamune et al. [18,19] will be followed. The use of the threo-erythro descriptors is restricted to sugars to avoid any ambiguity. 

Concerning the relative configuration of stereocenters in the products, the nomenclature used here is (usually) the syn/anti convention currently used for acyclic aldols and related compounds (6-8). To apply this convention, the carbon backbone is drawn in its longest extended (zigzag) form such as for 1.1 (Scheme 1). If both substituents on the chain project in the same direction from the plane of the carbon backbone as in 1.2 or 1.3, then the descriptor is syn. If the two substituents project in opposite directions from the plane of the carbon backbone as in 1.4 or 1.5 the descriptor is anti.f... 

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See also in sourсe #XX -- [ , ]

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