3,3-Disubstituted phthalides

A compound of the formula ##SPC5##

• where
• R.sub.2 and R.sub.3 each, independently, represent lower alkyl,
• or
• R.sub.2 and R.sub.3 together represent (CH.sub.2).sub.x
• where x represents 4, 5, 6 or 7, ##EQU2## where z represents O, S, or N-R.sub.4 where
• R.sub.4 represents lower alkyl,
• R.sub.5 and R.sub.6 each, independently, represent H, halo of atomic weight 19-36, lower alkyl, lower alkoxy or trifluorometyl,
• provided that R.sub.6 may not represent halo at the 6-position or lower alkyl at the 7-position,
• or an acid addition salt thereof.