| abstract |
The invention relates to novel spiro [2H-1-benzopyran-2,4'piperidine] -4 (3H) -one derivatives of the formula wherein R is a halogen, nitro or straight-chain or branched C1-6 alkyl group , and to their acid addition and quaternary salts of the formula wherein R and R 'are the same or different and are identical to R, or may also denote hydrogen and Z is one equivalent of anion. The compounds are effective in dementias of different pathological origin and accompanying symptoms. The invention also relates to a method for preparing the compounds and a method of treatment. |