All these isomers occur in commercial trinitronaphthalene, known as naphtite, which melts at about 110°.

< The nitration of a-, and ytrinitronaphthalene yields y- or

1,3,5,8-tetranitronaphthaiene (glistening tetrahedrons, m.p. 194-195°). The nitration of the ^-compound also yields or 1.3,6,8-tetranitronaphthalene (m.p. 203°), and that of the S-trinitro compound yields S- or 1,2,5,8-tetranitronaphthalene (glistening prisms which decompose at 270° without melting), a substance which may be formed also by the introduction of a fourth nitro group into y-trinitronaphthalene. The nitration of 1,5-dinitro-naphthalene yields oc-tetranitronaphthalene (rhombic crystals, m.p. 259°) (perhaps 1,3,5,7-tetranitronaphthalene), and this substance is also present in the crude product of the tetranitration, which, however, consists largely of the y-, and 6-isomers.

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