Protonation helps to delocalize the otherwise trapped diiminoquinone-diaminobenzene state.
2.
For example, it gives heterocycles upon condensation with urea and 1, 2-diaminobenzene.
3.
The primary intermediates are aromatic para compounds, such as 1, 4-diaminobenzene or 4-aminophenol.
4.
2, 5-Diaminotoluene is a substitute for phenylenediamine ( 1, 4-diaminobenzene ) in commercial hair dyes.
5.
One study used 2-iodoxybenzoic acid ( IBX ) as a catalyst in the reaction of benzil with 1, 2-diaminobenzene:
6.
In 1, 2-diaminobenzene ( " ortho "-phenylenediamine ), the two signals have nearly the same chemical shift, so that the resultant signals form a complex multiplet.
7.
Cyanamid is also a versatile synthetic building block for 1, 2-diaminobenzene and it forms with the readily available cyclic enamine 4-( 1-cyclohexenyl ) morpholine and an elemental sulfur a 2-aminothiazole in good yields.
8.
Tetramethylurea is suitable as a reaction medium for the polymerization of aromatic diacid chlorides ( such as isophthalic acid ) and aromatic diamines ( such as 1, 3-diaminobenzene ( m-phenylenediamine ) ) to aramids such as poly ( m-phenylene isophthalamide ) ( Nomex?
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