Benzoperylene

Benzo[ghi]perylene (1,12-benzoperylene) [191-24-2] M 276,3, m 273°, 277-278.5°, 278-280°, Purified as light green crystals by recrystn from CfiH6 or xylene and sublimes at 320-340° and 0.05mm [UV Helv Chim Acta 42 2315 7959 Chem Ber 65 846 1932 Fluoresc. Spectrum J Chem Soc 3875 7954]. 1,3,5-Trinitrobenzene complex m 310-313° (deep red crystals from C6Hg) picrate m 267-270° (dark red crystals from CgH6) styphnate (2,4,6-trinitroresorcinol complex) m 234° (wine red crystals from CgH6). It recrystallises from propan-l-ol [J Chem Soc 466 7959]. 

Okazaki 1988 frequency doubled diode laser (390 nm) used to excite the oxygen probe benzoperylene... 

This is not due to the relatively extended aromatic system in 25, for C. C. Wei and E. H. White 96> recently succeeded in synthesizing the benzoperylene compound 27 which is the most efficient hydrazide yet known with a chemiluminescence quantum yield of 7.3 % (in DMSO/ t-BuOK/02). The corresponding dicarboxylate has a fluorescence efficiency of 14% and emits at 420 and 450 nm which matches the chemiluminescence emission of 27 9 ). 

Common Name Benzo[ / /]perylene Synonym 1,12-benzoperylene, benzoperylene Chemical Name 1,12-benzoperylene CAS Registry No 191-24-2 Molecular Formula C22H12 Molecular Weight 276.330 Melting Point (°C) ... 

Benzoperylene, see Benzo[pAi]perylene Benzo[a]phenanthrene, see Benzo]a]anthracene, Chrysene Benzo[a]phenanthrene, see Chrysene... 

Perylene Benzoperylene Coronene Polycyolio Aromatio Hydrocarbons... 

C2. Perylene, quaterrylene, 2,3-8,9-dibenzoperylene, 3,4-benzo-pyrene, 1,12-benzoperylene, 1,14-benzobisanthrene, dibenzo-and hexabenzo-coronene, and hypericin. 

The crystal structure of 1,12-benzoperylene (77) was determined by White (1948) using two-dimensional methods and refined by difference Fourier syntheses (Trotter, 1959d). The related molecule 1,14-benzo-bisanthrene (78) has also been investigated (Trotter, 1958b). The y-coordinates of the atoms in 1,12-benzoperylene were obtained by White on the assumption of a planar molecule and were not altered by Trotter in his refinement. This precludes any detailed discussion of the... 

The sequence of events in coke formation was studies in the model reaction [70] of H-Y zeolite with propene at 723 K. Under these drastic conditions the soluble white coke formed rapidly within 20 min and was converted into insoluble coke within 6h under inert gas without loosing carbon atoms in the deposit. Due to the larger pores in the Y-zcolites compared to the ZSM type zeolites used in the other studies mentioned so far, the structure of the aromatic molecules is somewhat different. The soluble coke in this system consisted of alkyl cyclopentapyrenes (C H2 -26. Type A) as the hydrogen-rich primary product and of alkyl benzoperylenes (C H2n- 2. Type B) and alkyl coro-nenes (CrtH2 -36. Type C) as matured components. The temporal evolution of the various products is presented in Fig. 14. It clearly emerges that the soluble coke fractions are precursors for the insoluble coke and that within the soluble coke fraction the final steps of dehydrogenation-polymerization are very slow compared to the initial formation of smaller aromatic molecules from propene. The sequential formation of precursors with decreasing C H ratio follows from the shift of the maximum in the abundance of each fraction on the time axis. 

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