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Conversion of Azobenzenes into N,N′-Diarylhydrazines by Sodium Dithionite

Leiv K. Sydnes*, Shire Elmi, Per Heggen, Bjarte Holmelid, Didrik Malthe-Sørensen

*Department of Chemistry, University of Bergen, Allégt. 41, 5007 Bergen, Norway, Email:

L. K. Sydnes, S. Elmi, P. Heggen, B. Holmelid, D. Malthe-Sørensen, Synlett, 2007, 1695-1696.

DOI: 10.1055/s-2007-982565


Various azobenzenes have been reduced to the corresponding hydrazines by using an aqueous solution of sodium dithionite. The yield is generally excellent, but two compounds, viz. 4,4-dimethoxyazobenzene and 2,2,4,4,6,6-hexamethylazobenzene, gave no hydrazine at all.

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Key Words

azobenzenes, sodium dithionite, hydrazines

ID: J60-Y2007-2170