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benzidine
benzidine n. 
/ˈbɛnzᵻdɪn/,
Brit. /ˈbɛnzᵻdiːn/
, /ˈbɛnzᵻdiːn//ˈbɛnzᵻdɪn/U.S. /ˈbɛnzəˌdin/
an organic alkali, C12H12N2, deposited in crystals by the reduction of azobenzene./ˈbɛnzəˌdin/ΚΠ
1878 Jrnl. Chem. Soc. 34 668 This glyoxal derivative of benzidine differs from the preceding compounds.
1916 C. F. Cross & E. J. Bevan Text-bk. Paper-making (ed. 4) ix. 261 Benzidine is para-diamino-diphenyl, composed of two benzene rings joined together, each containing the amino radical NH2.
1946 Nature 30 Nov. 791/2 Such soil extracts gave a strong blue coloration with benzidine.
1966 G. P. Ellis Mod. Textbk. Org. Chem. xiv. 366 Benzidine (4, 4′-diaminodiphenyl)..is obtained by an interesting isomerization (the benzidine rearrangement) of hydrazobenzene..when it is heated with an acid.
1967 R. R. Karch & E. J. Buber Graphic Arts Procedures: Offset Processes vii. 268 Benzidine yellows also are very strong, but not as fast to light as the Hansa yellows, but are more transparent.
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