Polycyclic aromatic derivatives, process for preparing the same and pharmaceutical and cosmetic compositions containing the same

A polycyclic aromatic compound having the formula ##STR20## wherein X represents --CH.dbd.CH--,

• R.sub.1 represents hydrogen, branched alkyl having 3-15 carbon atoms, alkoxy having 1-6 carbon atoms or 1-adamantyl,
• R.sub.2 represents hydrogen, hydroxy, linear or branched alkyl having 1-15 carbon atoms or alkoxy having 1-6 carbon atoms, with the proviso that R.sub.1 and R.sub.2 are not simultaneously hydrogen, or R.sub.1 and R.sub.2 together with the adjacent carbon atoms of the naphthalene ring form a 5 or 6 carbon ring optionally substituted by at least one lower alkyl radical, or interrupted by an oxygen atom,
• R.sub.3 represents --CH.sub.2 OH or --COR.sub.4 or R.sub.3 represents --CH.sub.3 when R.sub.1 and R.sub.2 taken together form a 5 or 6 carbon ring,
• R.sub.4 represents --OR.sub.5 or ##STR21## R.sub.5 represents the residue of a sugar or the radical ##STR22## or R.sub.5 represents hydrogen or an alkyl radical having 1-20 carbon atoms when R.sub.1 and R.sub.2 taken together with the adjacent carbon atoms of the naphthalene ring form a 5 or 6 member carbon ring interrupted by an oxygen atom,
• p is 1, 2, or 3,
• r' and r" represent hydrogen, lower alkyl, monohydroxyalkyl, polyhydroxyalkyl, aryl optionally substituted as the residue of an amino acid or the residue of an amino sugar, or taken together form a heterocycle,
• and the salts of said polycyclic aromatic derivative of Formula I.