1. Anti-hypertensives: 1-alkyl-2-arylpiperazinoethyl-1H-naphth[1,2-d]imidazoles
2. Zur Kenntniss der α‐Naphtol‐α‐sulfosäure
3. An excess of barium hydroxide has to be avoided because barium peroxide also precipitates by reaction with excess hydrogen peroxide. To avoid this problem it is profitable to destroy excess hydrogen peroxide by introducing a catalytic amount of Pt black in the reaction mixture and stirring at room temperature till the peroxide test is negative, prior to the addition of Ba(OH)2