... Acta Chem. ... and 4-chloro-2-benzylpyrazole 1-oxide (9; Y=Cl) were prepared similarly; details are given in Table 1. 63 Acta Chemica Scandinavica 46 (1992) Bromination. ... Stirring for 10 min with a solution of sodium sulfite (0.78 g) in water (7 ml), isolation of the organic solution ...