Skip to product details

Chemical product profile

HONGKUN / PRODUCT DIRECTORY

(S)-(+)-2-Amino-1-butanol | CAS 5856-62-2

A stereochemically defined amino alcohol used in ethambutol intermediate chemistry, supplying an S-configured carbon next to a primary hydroxyl where enantiomeric composition and chemical purity require separate qualification.

CAS5856-62-2
Molecular formulaC4H11NO
Molecular weight89.14 g/mol

Product overview

The stereocentre at carbon 2 gives (S)-(+)-2-amino-1-butanol its value in routes that carry an amino-alcohol configuration into a larger molecule. A primary amine, a primary hydroxyl and an ethyl substituent surround this compact chiral building block. Published ethambutol synthesis uses the S amino alcohol to establish the required configuration of its amino-alcohol units. CAS 5856-62-2 identifies this enantiomer as the free amino alcohol. Qualification therefore needs more than a conventional purity result: the opposite enantiomer must be assessed separately, and any optical-rotation result must include the conditions under which it was measured.

Chemical identity

Chemical name
2-Amino-1-butanol, (+)-
CAS number
5856-62-2
Molecular formula
C4H11NO
Molecular weight
89.14 g/mol

Application context

Ethambutol routes use (S)-2-aminobutan-1-ol as a chiral intermediate, joining amino-alcohol units through nitrogen while retaining their existing stereocentres. The S configuration is therefore part of the raw-material identity, rather than an optional grade description. For this application, a chromatographic assay of total amino alcohol cannot establish the amount of the opposite enantiomer unless the analytical separation is enantioselective. State the required enantiomeric composition and the chemical impurity profile independently. If material is proposed as an acid-addition salt or with a different assay basis, reconcile the form and equivalents before comparing offers.

Chemistry and synthetic role

The structure HOCH2CH(NH2)CH2CH3 has one stereocentre at C2. The S configuration, free primary amine and terminal alcohol define the building block supplied under this CAS.

Quality review

Measure the opposite enantiomer

Agree a chiral analytical method and acceptance criterion independently of chemical assay.

Record rotation conditions

Optical rotation should be accompanied by temperature, wavelength and neat or solution measurement details.

Confirm form and related amino alcohols

Specify the free amino alcohol and review positional isomers, other amines and water according to the route.

Preparing a specification

State the S enantiomer, free-base form, chemical assay, opposite-enantiomer limit and chiral method. Define rotation conditions if used, relevant amino-alcohol impurities and water requirements.

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

Does high GC purity establish optical purity?

Only an enantioselective method can distinguish the R and S amino alcohols.

Is a positive rotation sign enough?

No. It supports identification only when measured and compared under defined conditions.

Can a salt be compared on the same weight basis?

The counterion and assay basis change the amount of amino alcohol represented by a given mass.

Technical sources
  1. PubChem CID 120084NCBI / PubChem
  2. (S)-(+)-2-Amino-1-butanolTCI
  3. Enantioselective methods for preparing chiral amine intermediatesWIPO patent WO2023197017A1