CAS Registry Number

CAS 107-86-8 — 3-Methyl-2-butenal

3-Methyl-2-butenal is an unsaturated aldehyde with a strong malty, green apple aroma, widely used in flavors and fragrances to impart fruity, green, and fresh notes in food, beverages, and perfumes. It appears as a colorless to pale yellow liquid with a pungent odor. CAS 107-86-8, molecular formula (CH3)2C=CHCHO, molecular weight 84.12. Store at 2 to 8°C in a cool, dark place. Hazardous—handle with care; signal word is **Danger**. Molekula supplies 3-Methyl-2-butenal from research to bulk quantities with full documentation and ISO 9001:2015 traceability.