Homo- and hetero-adduct polymers derived from unsymmetric diolefin crystals

Photo-reversible dimerisation reactions and their applications in polymeric systems

“…Generally only oligomeric species have been identied by GPC upon the direct analysis of soluble portions of the "as-polymerised" materials (entries 3 and 7). 87,91 Oen the polymerisation reactions only produce oligomeric species (entries 2, 5, 6, 9, 10 and 12), 86,88,89,93,94,96 so it is important to quantify the photo-product molecular weight and molecular weight distribution. It is interesting to note that many of the photo-products from the monomers listed in Table 4 were not tested for photodepolymerisation.…”

Topochemical photo-reversible polymerization of a bioinspired monomer and its recovery and repolymerization after photo-depolymerization

“…Also, due to the rigid polymer structures obtained, many of the materials are insoluble or poorly soluble in common organic solvents [27][28][29] and the polymer molecular weights have often only been studied using viscosity techniques. 27,[32][33][34] Monomers with significant structural variation have not been reported to undergo topochemical polymerization.…”

Topochemical photoreactions of unsymmetrically substituted diolefins. 2. Photopolymerization of 4'-(alkoxycarbonyl)-2,5-distyrylpyrazines

“…Found: C, 77.98; H, 5.99; N, 7.12. NMR (400 MHz in TFA) 9.56 (s, 1 H), 8.98 (s, 1 ), 8.20-8.04 (d, 1 H; d, 1 H), 7.88 (s, 5 ), 7.80-7.44 (d, 1 H; d, 1 H; m, 4 H); UV (t in HFIP) 378.2 (42800), 311.0 nm (23500).…”

“…2a: IR (KBr) 1725 (s), 1615 (m), 1485 (m), 1285 (s), 1115 (s), 980 (m), 700 (s) cm"1; 1H NMR (400 MHz in TFA) 8.82 (s, 1 ), 8.70 (s, 1 H), 7.95 (d, 2 ), 7.30-7.00 (m, 7 ), 5.40-4.70 (m, 4 ), 4.12 (s, 3 H); UV (e in HFIP) 284.6 (6100), 240.0 nm (10900). 2b: IR (KBr) 1715 (s), 1610 (m), 1480 (m), 1280 (s), 1105 (s), 1020 (m), 700 (s) cm"1; XH NMR (400 MHz in TFA) 8.85 (s, 1 H), 8.69 (s, 1 H), 7.99 (d, 2 ), 7.40-7.00 (m, 7 ), 5.40-4.40 (br m, 6 ), 1.54 (t, 3 H); UV (e in HFIP) 284.0 (9900), 238.2 nm (17 900). 2c: IR (KBr) 1720 (s), 1615 (m), 1500 (m), 1280 (s), 1110 (s), 940 (m), 700 (m) cm"1; NMR (400 MHz in TFA) 8.85 (s, 1 ), 8.00 (d, 2 ), 7.40-7.00 (m, 7 ), 5.50-4.40 (br m, 6 ), 1.98 (m, 2 ), 1.16 (t, 3 H); UV (c in HFIP) 284.8 (10600), 240.2 nm (19 300).…”