Hypobromites

The hypobromite ion

As hypobromites which are salts of hypobromous acid , respectively. Bromine is in the +1 oxidation state .

Hypobromites can be obtained by reacting bromine with alkalis . Molecular bromine disproportionates to bromide and hypobromite. The hypobromite salt can then be separated from the bromide salt by crystallization.

${\displaystyle \mathrm {Br_{2}\ +\ 2\ NaOH\longrightarrow \ NaOBr\ +\ NaBr\ +\ H_{2}O} }$

In Bromine this disproportionation takes place also, so it is slightly acidic.

${\displaystyle \mathrm {Br_{2}\ +\ 3\ H_{2}O\longrightarrow \ Br^{-}\ +\ BrO^{-}\ +\ 2\ H_{3}O^{+}} }$

Hypobromites are not stable and disproportionate to bromides and bromates , which is why they must be produced and stored at 0 ° C.

${\displaystyle \mathrm {3\ OBr^{-}\longrightarrow \ 2\ Br^{-}\ +\ BrO_{3}^{-}} }$

use

Hypobromites are used in the chemical laboratory as a reagent in the Hofmann rearrangement . Primary amines are formed from carboxamides .

See also

• Bromides : Br ^-
• Bromites : BrO ₂ ^-
• Bromates : BrO ₃ ^-
• Perbromate : BrO ₄ ^-

Individual evidence

1. ^ Siegfried Hauptmann : Organic Chemistry , Verlag Harry Deutsch, Thun (1985) p. 423, ISBN 3-87144-902-4 .