Dinitronaphthalene data

Capellos and Suryanarayanan (Ref 28) described a ruby laser nanosecond flash photolysis system to study the chemical reactivity of electrically excited state of aromatic nitrocompds. The system was capable of recording absorption spectra of transient species with half-lives in the range of 20 nanoseconds (20 x lO sec) to 1 millisecond (1 O 3sec). Kinetic data pertaining to the lifetime of electronically excited states could be recorded by following the transient absorption as a function of time. Preliminary data on the spectroscopic and kinetic behavior of 1,4-dinitronaphthalene triplet excited state were obtained with this equipment... 

Later Sapozhnikov [20] used Patart s data [19] for his triangular diagram, representing nitration of naphthalene (Figs. 104). In Fig. 105 and 106 the nitration curves for naphthalene and dinitronaphthalene are shown (Pascal [21]). 

The solubilities of both isomers of dinitronaphthalene, collected from the data of various authors are given in Table 95 (after Orlova [20b]. 

Dinitronaphthalene could be expected from the coulometric data [110] to undergo ring closure on reduction, but suitable conditions have not been found yet. The diamine [111] and 8-amino-5-hydroxy-l,4-naphthoquinone-1-imine [112] have been reported as products. 

The relationship valid for class II in Fig. 8a is excellently followed by the Sc data of 1,5-dinitronaphthalene (1,5-DNN), which means that the thermal decomposition of 1,5-DNN should begin by the interaction of the oxygen atom of the nitro group with the hydrogen atom at the perz-position [ 148], as contrasted with the presumed homolysis of the C - NO2 bond. 

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