Skip to product details

Chemical product profile

HONGKUN / PRODUCT DIRECTORY

Chloroacetaldehyde diethyl acetal | CAS 621-62-5

A two-carbon building block with a chloromethyl substitution site and a protected aldehyde, enabling side-chain installation before the carbonyl is revealed in a later synthetic step.

CAS621-62-5
Molecular formulaC6H13ClO2
Molecular weight152.62 g/mol

Product overview

Chloroacetaldehyde diethyl acetal separates two useful functions within ClCH2CH(OEt)2. The chloromethyl group provides a substitution site, while the aldehyde is held as a diethyl acetal. This arrangement allows a two-carbon unit to be introduced before subsequent carbonyl chemistry. A published example uses the reagent to prepare a phenoxyacetaldehyde intermediate through its protected acetal. CAS 621-62-5 must be distinguished from the free chloroacetaldehyde and the dimethyl acetal, which have different composition and handling requirements. For qualification, confirm both ethoxy groups and the chlorinated carbon skeleton, then review acetal integrity, water and relevant residual alcohol or related haloacetal components.

Chemical identity

Chemical name
Chloroacetaldehyde diethyl acetal
CAS number
621-62-5
Molecular formula
C6H13ClO2
Molecular weight
152.62 g/mol

Application context

Patent literature describes reacting chloroacetaldehyde diethyl acetal with a phenol to form a phenoxy-substituted acetal, followed by conversion to phenoxyacetaldehyde. This illustrates the sequential use of the two functions: substitution installs the aromatic ether side chain, while the protected carbonyl becomes available later. Such chemistry is useful in developing multifunctional organic intermediates without exposing a free aldehyde at every stage. Selection of the input should therefore consider whether the route needs the diethyl protecting form specifically. Water and acidic contamination are relevant qualification topics for an acetal-containing reagent, alongside chromatographic control of related chlorinated components.

Chemistry and synthetic role

The acetal carbon bears two ethoxy groups; the neighbouring CH2Cl remains a separate functional site. The material is a masked aldehyde, not a solution of free chloroacetaldehyde.

Quality review

Verify the two ethoxy groups

Use identity data to distinguish the diethyl acetal from methyl or cyclic acetals.

Check acetal integrity and moisture

Review water and any evidence of partial deprotection relevant to the batch and intended route.

Define volatile related components

Agree limits for residual ethanol and route-related haloacetals when they affect charging or purification.

Preparing a specification

Specify CAS 621-62-5, diethyl acetal identity, chromatographic assay, water and relevant alcohol/haloacetal limits. Confirm acidity criteria where preservation of the protecting group is important.

Packaging and storage

Reference handling information identifies this acetal as moisture-sensitive. Confirm container closure, moisture protection, storage and transport with the selected supplier SDS; pack format and quantity are agreed for the order.

Documentation

Request a batch COA, specification, identity data and SDS. Confirm the availability of the analytical methods and any application-specific impurity results with the proposed supplier.

Procurement questions

Is the aldehyde group free?

No. It is protected as a diethyl acetal.

Can the dimethyl acetal be substituted automatically?

No. Confirm the protecting group required by the route and its separate identity.

Why review ethanol?

It may be relevant as a residual or acetal-related component and should be controlled when it affects the application.

Technical sources
  1. Chloroacetaldehyde diethyl acetal C0084TCI
  2. Process of producing chloroacetalsEuropean Patent Office
  3. Autophagy-regulator compounds, example 11-5European Patent Office