# Cis- And Trans-2-isobutyl-4-methyl-1,3-dioxolane

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**Safety rating:** UNKNOWN
**CAS number:** 18433-93-7
**Category:** flavoring
**FDA GRAS:** no
**Adverse events (FDA AERS):** 0
**FDA recalls:** 0
**Last updated:** 2026-04-02

## Summary

Cis- and trans-2-isobutyl-4-methyl-1,3-dioxolane is a synthetic organic compound used as a flavoring agent in food products. This chemical creates specific taste and aroma profiles in processed foods and beverages.

## Regulatory status

| Country | Status |
| --- | --- |
| United States | approved |
| European Union | not_evaluated |
| United Kingdom | not_evaluated |
| Canada | not_evaluated |
| Australia | not_evaluated |
| Japan | not_evaluated |
| South Korea | not_evaluated |
| Brazil | not_evaluated |
| China | not_evaluated |
| India | not_evaluated |

## Detailed analysis

## What is Cis- and Trans-2-isobutyl-4-methyl-1,3-dioxolane?

Cis- and trans-2-isobutyl-4-methyl-1,3-dioxolane (CAS Number 18433-93-7) is a synthetic flavoring compound belonging to the dioxolane chemical family. The compound exists in two isomeric forms—cis and trans—which have identical molecular compositions but different spatial arrangements. This structural variation can influence how the compound interacts with taste and smell receptors, potentially affecting its sensory properties in food applications.

## Common Uses

This flavoring agent is employed in the food industry to provide or enhance specific taste and aroma characteristics in various products. Synthetic flavoring compounds like this one are typically used in very small concentrations, measured in parts per million (ppm), to achieve desired sensory effects. Common applications may include beverages, confectionery, baked goods, dairy products, and savory foods where complex flavor profiles are desired. The specific sensory notes this compound provides make it valuable for formulating foods that require particular taste characteristics that cannot be easily achieved through natural ingredients alone.

## Safety Assessment

According to FDA records, there are no reported adverse events associated with this additive, and no food recalls have been attributed to its use. The absence of documented safety incidents suggests that when used in approved applications and at appropriate levels, this compound has not raised acute safety concerns in the food supply.

However, it is important to note that this additive does not currently possess FDA GRAS (Generally Recognized as Safe) status. GRAS designation indicates that a substance is recognized as safe based on scientific evidence and expert consensus, typically through either prior approval in food or extensive scientific literature. The lack of GRAS status means this compound has not undergone the formal FDA safety review process that results in that classification.

The absence of GRAS status does not necessarily indicate safety concerns; rather, it may reflect that the compound has not been formally petitioned for such status, or that such a petition has not been approved. Some additives remain in use under FDA regulatory approval without GRAS designation.

## Regulatory Status

Regulatory approval for flavoring agents varies internationally. In the United States, synthetic flavoring compounds must be approved by the FDA before use in food. The regulatory pathway for flavoring agents can include direct FDA approval or GRAS status recognition. This particular compound's regulatory standing should be confirmed with current FDA databases and food additive regulations, as approval status can be complex and may involve specific use restrictions.

In the European Union, flavoring substances are subject to EU Regulation (EC) No 1334/2008, which maintains a positive list of approved flavorings. Approval status in different regulatory jurisdictions may vary.

## Key Studies

Scientific literature specifically addressing the safety profile of cis- and trans-2-isobutyl-4-methyl-1,3-dioxolane is limited in the publicly available domain. Research on synthetic flavoring compounds generally focuses on acute toxicity, chronic exposure effects, and potential genotoxicity or carcinogenicity.

Safety evaluation of flavoring agents typically involves laboratory studies assessing toxicity at various dose levels, metabolism and excretion patterns, and potential for bioaccumulation. Regulatory agencies rely on such data to establish safe levels of use in food products. The zero adverse event reports and zero recalls suggest that current use levels and applications have not produced documented safety signals in consumer populations.

## Sources

- FDA Substances Added to Food (CFSAN)
- OpenFDA Adverse Event Reporting System (AERS)
- OpenFDA Food Recalls
- EFSA OpenFoodTox
- EU Food Additive Portal

## Citation

Additive Facts. "Cis- And Trans-2-isobutyl-4-methyl-1,3-dioxolane — Safety, regulation, and evidence." https://additivefacts.com/additives/cis-and-trans-2-isobutyl-4-methyl-1-3-dioxolane. Accessed 2026-05-19.