Hydrazine p-bromophenyl

Pentono- and hexono-1,4-lactones yielded substituted arylhydrazides on treatment with m- and />-tolyl-, m- and p-methoxyphenyl, p-bromophenyl, and p-ethoxycarbonylphenyl-hydrazines (131). It was found that the rate of hydrazinolysis depends on the configuration of the aldonolactone, as well as on the aryl substituent on the hydrazine. 

A suspension of 2,6-di-p-bromophenyl-4-phenylpyrylium tetrachloroferrate in 96%-ethanol refluxed 14 hrs. with excess phenylhydrazine -> pyrazolo[2,3-a]-quinoline deriv. Y 60%. - Phenylhydrazine acts also as catalyst. Other agents such as hydrazine, hydroxylamine, or triethylamine were ineffective. F. e. and reactions of the products such as conversion into N-aminocarbostyrils, s. C. L. Pedersen and O. Buchardt, Acta Chem. Scand. 24, 834 (1970). 

Ethyl p-bromobenzenesulfinate mixed at room temp, with anhydrous hydrazine whereupon an exothermic reaction sets in gradually di-p-bromophenyl disulfide. Y almostl00%. F. reductions and limitations s. M. Kobayashi and A. Yamamoto, Bull. Chem. Soc. Japan 39, 2736 (1966) prepn. of anhydrous hydra-zine cf. I. Honda, Y. Shimonishi, and S. Sakakibara, Bull. Chem. Soc. Japan 40, 2415 (1967). 

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