Detail of "259-79-0"

Reference

N-Alkylphthalimide and copolymer derived therefrom

N-Alkylphthalimide and copolymer derived therefrom. Peters, Edward Norman (General Electric Co., USA). Eur. Pat. Appl. EP 142800 A2 29 May 1985, 15 pp. DESIGNATED STATES: R: DE, FR, GB, IT, NL. (English). (European Patent Organization). CODEN: EPXXDW. CLASS: ICM: C07D209-48. ICS: C08G073-10. APPLICATION: EP 84-113574 10 Nov 1984. PRIORITY: US 83-553174 18 Nov 1983. DOCUMENT TYPE: Patent CA Section: 35 (Chemistry of Synthetic High Polymers) Section cross-reference(s): 27 4,4'-(4,4'-Biphenylenedioxy)bis(N-alkylphthalimides), useful in the prepn. of monomers for polyimides, are prepd. by the reductive coupling of N-alkyl-4-(4-halophenoxy)phthalimides in the presence of Ni compds. and reducing agents. Thus, stirring 4-(4-chlorophenoxy)-N-methylphthalimide [98257-64-8] (prepd. from N-methyl-4-nitrophthalimide [41663-84-7] and p-chlorophenol [106-48-9]) 2.88, NiCl2 0.65, Zn dust 7.51, Ph3P [603-35-0] 5.00, and NaBr 5.00 g in 75 mL AcNMe2 at 70° for 3 h gave 2.1 g 4,4'-(4,4'-biphenylenedioxy)bis(N-methylphalimide) (I) [63227-28-1]. Sapon. of I and cyclization of the tetracarboxylic acid with Ac2O in o-C6H4Cl2 at 135° gave a dianhydride [26177-82-2]. Heating this anhydride 2.90, 4,4'-[isopropylidenebis(p-phenyleneoxy)]diphthalic anhydride 3.15, m-phenylenediamine 1.31, and phthalic anhydride 0.15, m-phenylenediamine 1.31, and phthalic anhydride 0.03 g in 35 mL m-cresol and 2.5 mL PhMe 4.5 h at 100-150° with H2O distn. and 1 h at 180° gave 6.6 g polyimide [98252-95-0] with intrinsic viscosity ( PhOH-C2H2Cl4, 30°) 0.56 dL/g and glass temp. 230°.

Biphenylenes

Biphenylenes. XXIX. Synthesis of cyclobuta[b]biphenylene-1-carboxylic acid and of cyclopenteno[b]biphenylene-1,2,3-trione. Buckland, Paul R.; McOmie, John F. W. (Sch. Chem., Univ. Bristol, Bristol, Engl.). Tetrahedron, 33(14), 1797-801 (English) 1977. CODEN: TETRAB. DOCUMENT TYPE: Journal CA Section: 26 (Condensed Aromatic Compounds) The title compds. (I and II, resp.) were prepd. 259-79-0 is also in the experiment. 259-79-0 which is the cas registry number of some chemical is mentioned. by photochem. ring contraction of 2-diazocyclopenteno[b]biphenylen-1-one and SeO2 oxidn. of cyclopenteno[b]biphenylen-1-one, resp. Evidence for increased strain in I compared with 2,3-dimethylbiphenylene is discussed. The preferred conformation of Z-2-(b-cyanovinyl)biphenylene is such that CN is close to the H atom attached to C-1. ..