All H and C NMR signals of the four poly(phenylenephthalides): polydiphenylenephthalide (P(DPh)-1), polyterphenylenephthalide (P(TPh)-2) and two sequentially ordered polymers with different ratios of alternating diphenylenephthalide and terphenylenephthalide units (P(DTPh)-3, P(DDTPh)-4) were assigned unequivocally with two-dimensional NMR techniques ( H- H COSY and NOESY; H- C HSQC and HMBC). There are four types of polyphenylene fragments: not symmetrical end, symmetrical inner, symmetrical pre-end and formally symmetric pre-end. The equivalent carbon atoms in these fragments have different chemical shifts. A full additivity of the chemical shifts for the side phthalide and polyphenylene carbon atoms was revealed. A new structure of diads with a mirror symmetry plane, passing through the middle of aromatic moieties, is proposed. Copyright © 2017 John Wiley & Sons, Ltd.

No abstract

No abstract

No abstract

No abstract

The behaviour of poly(3,3-phthalidylidene-4,4'-biphenylylene) (PPB) in acidic media was studied. In solvents with high acidity e. g. concentrated sulfuric acid, chlorosulfonic acid or PCI,, the phthalide groups of PPB were transformed into anthracen-9-one groups. Exposure time, solvent and temperature were found to affect the rearrangement of 3,3-diphenylphthalide and PPB in the presence of PCI,. The resulted polymers are soluble in common organic solvents and contain either 10-chloro-10-aryl-anthracen-9-one, or after hydrolysis, 10-hydroxy-1 O-arylanthracen-9-one units. Flexible and transparent polymer films were prepared by casting from the solution. 0 1993, Hiithig & Wepf Verlag, Basel CCC 0025-1 16X/93/$05.00 Poly(phthalidylideneary1ene)s

No abstract