Acenaphthylene radical

Atkinson, R., Aschmann, S.M. (1988) Kinetics of the reactions of acenaphthene and acenaphthylene and structurally-related aromatic compounds with OH and NOs radicals, N2Os and 03 at 296 2 K. Int. J. Chem. Kinet. 20, 513-539. 

Reisen, F., Arey, J. (2002) Reaction of hydroxyl radicals and ozone with acenaphthene and acenaphthylene. Environ. Sci. Technol. 36, 4302- -311. 

Bromine-atom atomic resonance absorption spectrometry (ARAS) has been applied to measure the thermal decomposition rate constants of CF3Br in Kr over the temperature range 1222-1624 K. The results were found to be consistent with recently published theory. The formation of cyclopent[a]indene and acenaphthylene from alkyl esters of biphenyl-mono- and -di-carboxylic acids has been observed in flash vacuum pyrolyses at 1000-1100 °C. The kinetics and mechanisms of free-radical generation in the ternary system containing styrene epoxide, / -TsOH, and i-PrOH have been examined in both the presence and absence of O2. ... 

Photolytic. Based on data for structurally similar compounds, acenaphthylene may undergo photolysis to yield quinones (U.S. EPA, 1985). In a toluene solution, irradiation of acenaphthylene at various temperatures and concentrations all resulted in the formation of dimers. In water, ozonation products included 1,8-naphthalene dialdehyde, 1,8-naphthalene anhydride, 1,2-epoxyacenaphthylene, and 1-naphthoic acid. In methanol, ozonation products included 1,8-naphthalene dialdehyde, 1,8-naphthalene anhydride, methyl 8-formyl-1-naphthoate, and dimethoxyacetal 1,8-naphthalene dialdehyde (Chen et al., 1979). Acenaphthylene reacts with photochemically produced OH radicals and ozone in the atmosphere. The rate constants and corresponding half-life for the vapor-phase reaction of acenaphthylene with OH radicals (500,000/cm ) at 25 °C are 8.44 x lO " cmVmolecule-sec and 5 h, respectively. The rate constants and corresponding half-life for the vapor-phase reaction of acenaphthylene with ozone at 25 °C are... 

X 10 cmVmolecule-sec and 1 h, respectively. The overall atmospheric half-life was estimated to range from 0.191 to 1.27 h (Atkinson, 1987). Similarly, measured rate constants for the gas-phase reaction of acenaphthylene with OH radicals and ozone are 1.24 x 10 cmVmolecule and 1.6 x lO" cmVmolecule, respectively (Reisen and Arey, 2002). 

The products of polyethylene modification are mixed Mock and graft copolymers of three dimensional structures (with acrylic acid, methacrylamide and acrylonitrile) or linear structures (acenaphthylene and maleic anhydride). This is again consistent with the nature of the monomers and the activity of their radicals. 

Sequential SET desilylation has been used to generate a-amino radicals. The mechanistic and synthetic aspects of the reaction have been briefly surveyed.283 Thus irradiation of A, N- d i e t h y 11 r i m e t h y I si I yl meth y I a m i n e with acenaphthenequinone in acetonitrile or methanol produces 2-hydroxy-2-[(diethylamino)methyl]acenaphthylen-1-one.284... 

Fig. 18a, b. A schematic model of the dispersion of the aromatic additives in polymer matrix, a) Acenaphthene system acenaphthene (At) and reaction products between aromatic fragment radicals from crosslinking agent and the naphthalene ring of the additives (Xn) dispersed in polymer chains, b) Acenaphthylene system acenaphthylene (Ay) and Xn molecules are fixed to polymer chains [88]... 

According to X-ray crystallography and NMR data, coupling of the radical anions of acenaphthylene in these reaction occurs stereoselectively affording exclusively C2-symmetric rac-ani a-lanthanidocenes. The related C2-symmetric rac-ani a-ytterbocene complex (Gaz)2Yb(THF)2 (Gaz = guajazulene) (Figure 114) is isolated when GAZ is reacted with (CioH8)Yb(TFIF)2. ... 

Using ammonium cerium(IV) nitrate (CAN) as the oxidant for the azide anion, the azido radicals are trapped by alkenes, to form, ultimately, /i-azido nitrates84 cerium azide species may be considered as intermediates. Alkenes conjugated with carbonyl groups are recovered intact. The stereochemistry of the adducts from acenaphthylene and indene was trans, as shown by H-NMR studies (/AX < 2 Hz for the acenaphthylene adduct), but with (-Eyi-phenyl-l-propene both syn and anti additions were formed. 

The mechanism of the electron transfer-sensitised dimerisation of acenaphthylene (188) has been studied in considerable detail. Two dimers (189) and (190), formed from the radical cation of acenaphthylene, are obtained in addition to (191) and (192) which incorporate the TCNE sensitiser. Fumaroni-trile behaves in a similar fashion yielding the dimers (189) and (190) as well as cycloadducts. A study of the energetics of electron transfer in acenaphthylene charge transfer photochemistry has been carried out. ... 

Note, however, that Cristol et al.5 chlorinated acenaphthylene (1) with iodobenz-ene dichloride in chloroform containing 1,3,5-trinitrobenzene as radical-inhibitor... 

Odd-Alternate Polynuclear Aromatic Hydrocarbon Radicals. Substantial evidence supports the contention that the stable free radicals formed during the pyrolysis of polynuclear aromatic compounds are odd-alternate hydrocarbon radicals. As an example, the phenalenyl radical (5) is formed during pyrolysis of a number of organic compounds including acenaphthylene (3) and dihydronaphthalene (4) (24) (see Scheme III). The... 

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