Topochemical triene polymerization

Related to the topochemical diene polymerization is the topochemical triene polymerization. Because dienes successfully undergo a topochemical polymerization with supramolecular structural features similar to topochemical diyne polymerization it would be anticipated that trienes would require similar supramolecular parameters as for triynes. 

The first report of a topochemical 1,6-polymerization of a conjugated triene was recently described by Lauher and co-workers [39]. In particular, the double ester of l,8-dihydroxy-2,4,6-octatriene and nicotinic acid (Scheme 2.3.5) was found to adopt a solid-state packing arrangement conducive for the 1,6-polymerization. Specifically, the molecules were oriented at a repeat distance of 7.2 A (Fig. 2.3.3(a)). Although the separation between terminal carbon atoms of adjacent triene moieties was somewhat large (4.09 A), the solid underwent a SCSC topochemical... 

Table 5.3. Application of the host-guest strategy to the organization of trienes for a topochemical polymerization. 

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