TRINUCLEUS - STRUCTURE DETERMINATION BY H-1, C-13 AND N-15 NMR

Oxidative hair dyeing generally involves a ''base'' and a ''coupler'' to give an indoaniline or an indophenol. In certain cases, further reaction of the indo-dye results in the formation of a tri-nuclear compound called ''TRINUCLEUS''. The structures of seven of these compounds have been determined by means of H-1, C-13 and N-15 NMR including two-dimensional H-1-C-13 and H-1-N-15 heteronuclear correlated techniques. It has been shown that these compounds exist with a benzoquinonimine structure as the central ring. Tautomeric forms may be observed when the ''coupler'' is resorcinol.