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Chemical product profile

HONGKUN / PRODUCT DIRECTORY

1-Chloro-2-methyl-2-propanol | CAS 558-42-9

A branched chlorohydrin with a tertiary alcohol and a chloromethyl group, appearing upstream of amino-alcohol intermediates in published lercanidipine chemistry; exact naming is essential to distinguish it from chlorobutanol.

CAS558-42-9
Molecular formulaC4H9ClO
Molecular weight108.57 g/mol

Product overview

1-Chloro-2-methyl-2-propanol places an alcohol on a carbon bearing two methyl groups and a chloromethyl substituent. The resulting structure combines a tertiary alcohol with a primary carbon–chlorine site. It is also called chloro-tert-butyl alcohol. That shortened name should always be accompanied by CAS 558-42-9 and the complete structure, because chlorobutanol denotes a different, more highly chlorinated compound. This material belongs to chlorohydrin intermediate chemistry. A useful purchasing specification should establish identity, organic purity and water or solvent content in terms appropriate to the receiving reaction. A liquid appearance description alone cannot distinguish it from other chlorinated alcohols or confirm its suitability for a defined synthesis.

Chemical identity

Chemical name
1-Chloro-2-methyl-2-propanol
CAS number
558-42-9
Molecular formula
C4H9ClO
Molecular weight
108.57 g/mol

Application context

Published lercanidipine process chemistry identifies this chlorohydrin as a precursor to a methylamino-substituted tertiary alcohol component. The branched alcohol framework is retained as the molecule progresses towards the amino-alcohol portion used in downstream ester intermediate construction. Its role is therefore upstream: the chlorohydrin supplies a small, specifically substituted fragment rather than the complete drug structure. When qualifying material for this type of route, evaluate the organic component profile and the basis of the content result alongside the intended conversion. Water and residual-solvent requirements should be agreed with the process team. The same chemical name should also be used consistently on the purchase order, lot documents and receiving records, particularly where an older catalogue or internal system uses the ambiguous term chlorobutanol.

Chemistry and synthetic role

The carbon bearing OH is tertiary, whereas chlorine is attached to the adjacent CH2 group. The two methyl groups make this structure achiral; it does not define the stereochemistry of a downstream drug.

Quality review

Prevent name-based substitution

Match CAS 558-42-9 to the full chlorohydrin structure on the order and COA. Avoid the standalone name chlorobutanol.

Resolve organic components

Agree a GC method and review relevant chlorinated-alcohol and process-related components rather than relying on appearance.

Set the content basis

Specify calibrated assay or chromatographic purity as required, and agree water and residual-solvent reporting for the receiving reaction.

Preparing a specification

Request 1-chloro-2-methylpropan-2-ol, CAS 558-42-9, with structural identification, a defined GC or assay method and route-specific water and solvent limits. Ensure every commercial document uses the same unambiguous identity.

Packaging and storage

Reference handling information describes a flammable liquid requiring a tightly closed container and cool, well-ventilated storage away from ignition sources. Final conditions and transport requirements follow the actual batch SDS; packaging and net quantity are confirmed with the selected grade.

Documentation

Request a lot COA, identity data and organic-impurity chromatogram. Obtain the selected-source SDS before arranging storage or transport and confirm availability of water and solvent results where specified.

Procurement questions

Is this chlorobutanol?

No. Use the complete name and CAS 558-42-9; chlorobutanol is a different chemical identity.

Where does it enter lercanidipine chemistry?

Published routes place it upstream of a methylamino-substituted tertiary alcohol intermediate.

Does this material require an enantiomeric-purity specification?

Its structure is achiral. Requirements for chiral downstream compounds are assessed separately.

Technical sources
  1. PubChem CAS-resolved identity, CID 68409NCBI / National Library of Medicine
  2. 1-Chloro-2-methyl-2-propanol C0971Tokyo Chemical Industry
  3. EP1860102B1 — Process for producing lercanidipinePatent applicant / EPO