abstract |
The invention provides quaternary dibenzoylmethane derivatives of the formula <IMAGE> in which R1, and R2 present a lower alkyl or hydroxyalkyl radical, R3 represents a lower alkyl or alkoxy radical, n is 0 or an integer from 1 to 3 and X< THETA > is an anion derived from a mineral or organic acid. These compounds can be used as UV.A sun filters. |