Depending on the volume and electron-withdrawing properties of the substituents in the heterocyclic ring, reaction of β-(benzofur-2-yl)- and -(indol-2-yl)enamines with benzoquinone leads to the ...formation of 3-heteroarylbenzofurans, with or without a dimethylaminogroup in the position 2. If dehydrogenation is impossible, as in the case of α-methyl-β-heteroarylcnamines, furo2,3-fbenzofurans are formed.
3-Heteroarylbenzofurans with or without a dimethylaminogroup in position 2 are obtained by the Nenitzescu reaction of β-heterylenamines
Results on the study of localized fluctuations in the multiplicity of charged particles and photons produced in 158A GeV/c Pb+Pb collisions are presented for varying centralities. The charged versus ...neutral particle multiplicity correlations in common phase space regions of varying azimuthal sizes are analyzed by two different methods. Various types of mixed events are constructed to probe fluctuations arising from different sources. The measured results are compared to those from simulations and from mixed events. The comparison indicates the presence of nonstatistical fluctuations in both the charged particle and photon multiplicities in limited azimuthal regions. However, no correlated charged-neutral fluctuations, a possible signature of formation of disoriented chiral condensates, are observed. An upper limit on the production of disoriented chiral condensates is set.
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