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Chemical product profile

HONGKUN / PRODUCT DIRECTORY

1,4-Cyclohexanedione monoethylene ketal | CAS 4746-97-8

A differentiated diketone equivalent with one free cyclohexanone carbonyl and one spiro ethylene ketal, supporting selective framework construction before the protected carbonyl is restored.

CAS4746-97-8
Molecular formulaC8H12O3
Molecular weight156.18 g/mol

Product overview

Protecting only one carbonyl of 1,4-cyclohexanedione creates a building block with two deliberately different reaction sites. In the monoethylene ketal, one site remains a ketone and the other is masked within a spiro dioxolane ring. The compound is also named 1,4-dioxaspiro[4.5]decan-8-one. Published synthesis uses this combination to build new carbon frameworks while retaining a protected ketone for later release. CAS 4746-97-8 refers to the monoprotected species, not the unprotected diketone or the bis-ketal. Qualification should confirm the one-ketone/one-ketal arrangement and review impurities that change the balance between available and masked carbonyl groups, along with moisture or acidity relevant to protection integrity.

Chemical identity

Chemical name
1,4-Cyclohexanedione monoethylene ketal
CAS number
4746-97-8
Molecular formula
C8H12O3
Molecular weight
156.18 g/mol

Application context

A published route to substituted 2-tetralones uses 1,4-cyclohexanedione monoethylene ketal in ring-transformation chemistry with pyranones, followed by hydrolysis of the ketal-containing intermediates. The same starting material has also been used to prepare a spirocyclic dienone investigated in stereoselective Diels–Alder reactions. These research examples exploit the ability to act at one carbonyl-derived site while carrying a second as a protected function. Buyers should therefore qualify the degree of protection, not simply the overall carbonyl content. Diketone and bis-ketal components would offer different numbers of reactive ketones and can require different downstream treatment.

Chemistry and synthetic role

A six-membered carbocycle shares one spiro atom with a five-membered dioxolane ketal. The ketone at the opposite ring position remains available for carbonyl chemistry.

Quality review

Confirm one free and one protected carbonyl

Identity testing should establish the spiro ketal and the remaining ketone together.

Separate under- and over-protected species

Review 1,4-cyclohexanedione and the corresponding bis-ketal where relevant to the manufacturing route.

Check conditions affecting ketal integrity

Agree water and acidity criteria and a sample preparation that does not distort the protection profile.

Preparing a specification

Specify CAS 4746-97-8, monoethylene ketal identity, chromatographic assay and limits for diketone/bis-ketal species. Include water and acidity requirements consistent with preserving the desired protection state.

Packaging and storage

Reference handling information identifies light and moisture sensitivity. Confirm protection during storage, closure and transport with the actual supplier SDS; packaging material and net weight are agreed for the selected 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

Are both ketones protected?

No. One remains a ketone and one is an ethylene ketal.

Is 1,4-dioxaspiro[4.5]decan-8-one a different product?

It is another name for this monoketal.

Why check the bis-ketal impurity?

A bis-ketal lacks the free ketone needed for the first carbonyl transformation.

Technical sources
  1. 1,4-Cyclohexanedione monoethyleneketal C1292TCI
  2. Metal-free synthesis of 2-tetralones by ring transformationSynthesis / Thieme
  3. Facial selectivity in cycloadditions to a spirocyclic dienoneOrganic Letters / PubMed