The reaction of Grignard reagents with 1,2-di-isocyanoarene results in the formation of quinoxalineoligomers up to a hexa-oligomer, which may be derived from successive insertion of the two ortho isocyano groups of 1,2-di-isocyanoarene into the carbon–magnesium bond.
The invention relates to compounds of the formula (I) or (II), to compositions which comprise such compounds, to corresponding processes for the preparation of the compounds or the compositions comprising same, and to the use thereof as light-protection filters.