S-(1-Methylpropyl) 3-methylbut-2-enethioate (CAS 34322-09-03) — Sweet Top to middle Note Fragrance Ingredient
S-(1-Methylpropyl) 3-methylbut-2-enethioate
CAS 34322-09-03
What Is S-(1-Methylpropyl) 3-methylbut-2-enethioate?
S-(1-Methylpropyl) 3-methylbut-2-enethioate is a synthetic fragrance compound primarily used in perfumery. It’s encountered in niche fragrances and specialty formulations. This ingredient matters because it contributes unique sulfurous-fruity nuances that are difficult to achieve with more common materials, allowing perfumers to create distinctive accords.
Safety Profile
USE WITH AWARENESSWhat Does S-(1-Methylpropyl) 3-methylbut-2-enethioate Smell Like?
A complex interplay of tropical fruit and sulfury depth, reminiscent of overripe passionfruit with a savory edge. Opens with a burst of juicy mango skin and catty intensity, settling into a warm, musky base with hints of blackcurrant bud. The sulfur character provides a lingering animalic trail that enhances longevity without overpowering.
Chemistry, Properties & Perfumer Guide
The Chemistry
This thioester belongs to the class of sulfur-containing fragrance compounds, synthesized through esterification of 3-methyl-2-butenethiol with sec-butyl alcohol. The sulfur linkage provides enhanced volatility and impact compared to oxygen esters. The branched structure creates steric hindrance that influences both odor character and stability against hydrolysis.
Physical & Chemical Properties
| Appearance | Colorless to pale yellow liquid |
|---|---|
| Boiling Point | Estimated 180-200°C |
| Density | Approx. 0.92 g/cm³ |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 0.1-0.5% | Up to 1% | Powerful modifier |
| Functional Fragrance | 0.01-0.1% | Up to 0.3% | Trace amounts sufficient |
Classic Accords
Tip: Use in micro-doses to avoid overwhelming compositions; excellent for adding tropical dimensionality to fruity florals.
Alternatives & Comparisons
Similar sulfur-fruit character but more diffusive and less tenacious.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
Not currently restricted by IFRA standards.
RIFM Assessment
No specific RIFM assessment found; general thioester safety guidelines apply.
Sustainability
As a synthetic material, production avoids agricultural land use. However, sulfur chemistry requires careful waste management. The compound’s potency means small quantities suffice, reducing overall environmental load compared to less powerful ingredients.
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