Linkage positions, oligosaccharide synthesis

Despite these considerations, there has been substantial progress in recent years in the synthesis of oligosaccharides on a solid phase. Since the central issue here is glycosidation, this topic is the current focus. An obvious decision at the outset is the mode of linkage of the saccharide oligomer to the solid phase, either attachment at the anomeric center, or attachment to the polymer through one of the other positions. This question is illustrated in the following two examples. 

---