The synthesis and evaluation of novel photosensitisers for controlled degradation of polyethylene

Synthesis, structures and properties of self-assembling quaternary ammonium dansyl fluorescent tags for porous and non-porous surfaces

“…Yield: 1.03 g (90.2%). Mp ¼ 84-86 C. 1 H NMR (400 MHz, CDCl 3 , d): 7.80 (d, 2H, J ¼ 8.7: H1), 7.74 (d, 2H, J ¼ 7.3: H7), 7.54 (t, 1H, J ¼ 7.3: H3), 7.47 (t, 2H, J ¼ 7.6: H2), 6.93 (d, 2H, J ¼ 8.8 Hz: H8), 4.06 (t, 2H, J ¼ 5.9 Hz: H10), 3.26 (t, 2H, J ¼ 6.7 Hz: H13), 2.10-2.02 (m, 2H: H11), 2.00-1.90 (m, 2H: H12) ppm; 13 39 4-(6-Bromohexoxy)benzophenone. 38,39 1,6-Dibromohexane (6.21 mL: 40.4 mmol), K 2 CO 3 (2.79 g: 20.2 mmol) and 4hydroxybenzophenone (2.00 g: 10.1 mmol) were stirred in ACN (20 mL) under reux for 24 h to give a crude product of 4-(6bromohexoxy)benzophenone which was recrystallized in toluene-hexanes (1 : 2) to yield a white coloured powder.…”

“…Mp ¼ 65-66 C. 1 4-(6-Iodohexoxy)benzophenone. 39 4-(3-Bromohexoxy)benzophenone (0.500 g: 1.38 mmol) and NaI (0.622 g: 4.15 mmol) were mixed in acetone (10.0 mL) under reux for 24 h to give crude product of 4-(6-iodohexoxy)benzophenone which was recrystallized in toluene-hexanes (1 : 2) to afford an off white coloured powder. Yield: 0.480 g (85.0%).…”

“…(This data is in good agreement with previously reported values.) 39 5-(Dimethylamino)-N-(3-(dimethylamino)propyl)naphthalene-1-sulfonamide 1. 40,41 To a ame dried 500 mL round bottom ask with a reux condenser connected to an inert atmosphere manifold, anhydrous DCM (300 mL) was added followed by dansyl chloride (10.0 g: 37.07 mmol), Et 3 N (8 mL: 55.6 mmol).…”