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Chemical product profile

HONGKUN / PRODUCT DIRECTORY

tert-Butylhydrazine hydrochloride | CAS 7400-27-3

An N-tert-butyl-substituted hydrazine salt used in pyrazole-ring construction, carrying a directly bonded tert-butyl group rather than a tert-butoxycarbonyl protecting group.

CAS7400-27-3
Molecular formulaC4H13ClN2
Molecular weight124.61 g/mol

Product overview

The nitrogen–nitrogen bond of tert-butylhydrazine provides the paired nitrogen atoms needed for pyrazole chemistry. One nitrogen bears tert-butyl directly, giving a structure distinct from Boc-protected hydrazine, which contains an intervening carbonyl and oxygen. CAS 7400-27-3 identifies the hydrochloride salt. Consequently, a purchase specification should define the salt basis as well as the hydrazine identity, and account for water uptake when calculating reagent equivalents. Tests that assess chloride and reducing capacity answer different questions from an organic identity or impurity method.

Chemical identity

Chemical name
tert-Butylhydrazine hydrochloride
CAS number
7400-27-3
Molecular formula
C4H13ClN2
Molecular weight
124.61 g/mol

Application context

Patent examples use material identified by CAS 7400-27-3 to construct N-tert-butylpyrazole intermediates from suitable carbonyl-derived partners. The hydrazine supplies the adjacent ring nitrogens and the tert-butyl substituent in the newly formed heterocycle. For route qualification, related hydrazines deserve attention because they may produce differently substituted ring products. Water, salt stoichiometry and the assay basis also affect how the reagent charge is interpreted.

Chemistry and synthetic role

The free-base framework is tert-Bu–NH–NH2. The tert-butyl carbon is bonded directly to nitrogen; there is no carbamate group.

Quality review

Distinguish tert-butyl from Boc

Verify direct N–C attachment, not tert-butoxycarbonyl substitution.

Reconcile salt and active assay

Confirm what each titration measures and how results relate to hydrochloride equivalents.

Control other hydrazines and water

Use route-specific limits for related hydrazines and moisture.

Preparing a specification

State tert-butylhydrazine monohydrochloride, assay methods and reporting basis, water and limits for other hydrazines relevant to ring construction.

Packaging and storage

Packaging and net weight are agreed for the selected grade, order quantity and destination. Check the actual supplier SDS and label for storage and transport requirements.

Documentation

Request a batch COA, SDS and the analytical methods for the acceptance criteria below. Confirm which supporting chromatograms and identity data are available from the selected manufacturer.

Procurement questions

Is this Boc hydrazine?

No. Boc hydrazine has additional oxygen and carbonyl functionality.

Do chloride and hydrazine titrations measure the same thing?

They assess different parts of the material and do not replace structural identification.

Why review related hydrazines in a pyrazole route?

Their substitution patterns can be transferred into alternative heterocycles.

Technical sources
  1. PubChem CID 81889NCBI / PubChem
  2. tert-Butylhydrazine hydrochlorideTCI
  3. Phenoxymethyl derivativesPatent publication