Results 171 to 180 of about 3,133 (222)

Solution Properties and Chain Stiffness of Poly(Acenaphthylene)

Journal of Macromolecular Science - Pure and Applied Chemistry, 1993
Solution properties of poly(acenaphthylene) (PACN) were investigated in a theta solvent (1,2-dichloroethane) and a good solvent (chloroform). The viscosity exponent alpha was found to be 0.50 at both 35 and 41-degrees-C in 1,2-dichloroethane. Unperturbed
GOKSEL, C, KUCUKYAVUZ, S, KUCUKYAVUZ, Z
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The electronic spectrum of acenaphthylene

Journal of Molecular Spectroscopy, 1970
Abstract The electronic absorption spectrum of acenaphthylene has been measured in the vapor and pure crystal phases, and in single crystal matrices of acenaphthene, fluorene, naphthalene, and durene. Acenaphthylene preferentially occupies one of the two inequivalent types of sites in the acenaphthene lattice.
R.D. Gordon, R.F. Yang
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Mechanism of Photodimerization of Acenaphthylene

The Journal of Organic Chemistry, 1997
The mechanism of photodimerization of acenaphthylene (ACN) has been investigated in order to elucidate the roles of the singlet and the triplet excited states of ACN in the formation of the Z- and E-dimers in several solvents. The quantum yields and the ratio of the produced Z- to E-dimer were determined under irradiation of ACN at 435.8 nm in several ...
Naoki Haga, Hiroaki Takayanagi, Katsumi Tokumaru   +2 more
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Preparation and Catalytic Hydrogenation of Spiro[acenaphthylene‐dioxazoles] and spiro[acenaphthylene‐isoxazoles]

Liebigs Annalen der Chemie, 1986
AbstractWittig monoolefination of acenaphthylene‐1,2‐quinone (1) with ethyl (triphenylphosphoranylidene)acetate yields the o‐quinomethane derivative 2 which by 1,3‐dipolar cycloaddition reactions with aromatic nitrile oxides affords regioselectively the spiro[acenaphthylene‐isoxazoles] 3 and 4.
Demetrics A. Lefkaditis, Nicolaos G. Argyropoulos, Demetrios N. Nicolaides   +2 more
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A Phosphorus Analogue of Acenaphthylene

European Journal of Organic Chemistry, 2017
A 1‐phosphaacenaphthylene has been obtained by the deprotonation and collapse of the phosphorus bridge of an appropriate 7‐phosphanorbornenium salt. DFT computations showed that the molecule has an elongated P=C double bond of 1.736 Å with a strained C–P=C angle of 88.9°. The P lone pair corresponds to the HOMO–2.
Haiyang Huang, Zhibin Wei, Mincan Wang, Zheng Duan, François Mathey   +4 more
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The heat of acenaphthylene polymerization

Journal of Polymer Science: Polymer Letters Edition, 1983
Reaction effectuee dans le chlorure de methylene a 273, 291 et 308°K en presence d'acide ...
M. Soledad Anasagasti, L. M. León
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Energetics of the Thermal Dimerization of Acenaphthylene to Heptacyclene

The Journal of Physical Chemistry A, 2006
The energetics of the thermal dimerization of acenaphthylene to give Z- or E-heptacyclene was investigated. The standard molar enthalpy of the formation of monoclinic Z- and E-heptacyclene isomers at 298.15 K was determined as Delta(f)H(m)o (E-C24H16, cr) = 269.3 +/- 5.6 kJ x mol(-1) and Delta(f)H(m)o (Z-C24H16, cr) = 317.7 +/- 5.6 kJ x mol(-1 ...
Rui C, Santos, Carlos E S, Bernardes, Hermínio P, Diogo, M Fátima M, Piedade, José N, Canongia Lopes, Manuel E, Minas da Piedade   +5 more
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Order and disorder in acenaphthylene

Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences, 1973
Abstract Acenaphthylene, C12H8, occurs in space group Pbam (or Pba2) at room temperatures (23 °C) with a = 7.705 (5), b = 7.865 (5), c = 14.071 (5) Å and Z = 4, and is disordered. At about 130 K it undergoes a reversible transition to space group P21 nm with a = 7.588 (13), b = 7.549 (10), c = 27.822 (2) Å and Z = 8 (85 K) with an ...
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Protonation of azuleno [1,2-a]acenaphthylene and 7-bromoazuleno[1,2-a]acenaphthylene in superacids: azulenium, acenaphthenium or naphthalenium cations?

Journal of the Chemical Society, Perkin Transactions 2, 1996
Persistent monocation 1aH+ has been formed as the major product of low temperature protonation of azuleno [1,2-a] acenaphthylene 1 with FSO3H·SO2ClF or FSO3H·SbF5(4:1)–SO2ClF superacid media. Protonation at C-7(→1bH+) was observed only as a minor competing process (10–15%).
Laali, K.K., Bolvig, S.S., Kuroda, S., Oda, M., Mouri, M., Shimao, I., Kajioka, T., Yasunami, M.   +7 more
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POLYMERS AND COPOLYMERS OF ACENAPHTHYLENE

Journal of Applied Chemistry, 1951
AbstractAn exploratory survey of the polymerization and copolymerization of acenaphthylene has been carried out to see whether there are possibilities of its use as an industrial monomer. Polyacenaphthy‐lene been prepared by thermal polymerization with and without peroxide‐type catalysts, by Friedel‐Crafts polymerization and by the emulsion technique ...
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