DMSO Synthesis Grade | High-purity solvent for pharmaceutical API synthesis

Solvent purity and consistency in pharmaceutical synthesis

DMSO Synthesis Grade: a high-purity solvent for API manufacturing

Key benefits of DMSO Synthesis Grade include:

• High chemical purity: A minimum assay of 99.98% by gas chromatography (GC) gives a well-defined, low-impurity specification that supports pharmaceutical quality assurance and documentation.
• Controlled moisture content: A maximum water content of 0.03% wt, determined by Karl Fischer titration, supports moisture-sensitive reactions and consistent reaction performance batch to batch. As DMSO is inherently hygroscopic, appropriate handling and storage practices are needed to maintain this specification through use.
• Low UV-active impurity levels: Maximum UV absorbance readings of 0.3 at 275 nm, 0.2 at 285 nm, and 0.2 at 295 nm indicate low levels of UV-active impurities, supporting analytical documentation and quality control processes.
• Backwards-integrated manufacturing: gChem produces DMSO Synthesis Grade at its highly automated facility in Tuscaloosa, USA, backwards-integrated into all critical raw materials following a 2023 investment, supporting supply reliability and manufacturing consistency.
• Defined regulatory and safety profile: DMSO is classified as an ICH Q3C (R9) Class III solvent with a low toxicity profile, with an oral LD₅₀ (rat) of 14,500 mg/kg, positioning it as a low toxic potential alternative to Class II dipolar aprotic solvents such as DMF, DMAc, and NMP. DMSO is a skin penetrant capable of carrying dissolved compounds across the skin barrier, so handling controls remain important regardless of its favourable toxicity classification.

DMSO applications across pharmaceutical synthesis routes

1.  Nucleophilic substitution reactions: DMSO's polarity and aprotic character facilitate nucleophilic substitutions, including Finkelstein reactions and other halogen-exchange processes used across pharmaceutical synthesis routes.
2. Selective oxidation reactions: Once activated, for example in Swern-type oxidations, DMSO supports mild, selective oxidation of pharmaceutical intermediates in the presence of highly sensitive functional groups.
3. Solid- and liquid-phase peptide synthesis: DMSO offers a potential alternative to DMF and NMP in solid-phase peptide synthesis (SPPS), particularly as a binary blend with ethyl acetate or 2-methyltetrahydrofuran (2-MeTHF) that supports the physical properties needed for common solid-phase resins. DMSO/2-MeTHF blends are also increasingly applied in tag-assisted liquid-phase peptide synthesis (TAG-LPPS), where this methodology has demonstrated a 65% reduction in solvent usage compared with equivalent SPPS processes.
4. Wittig and Strecker reactions: DMSO performs effectively under both salt and salt-free Wittig reaction conditions and supports a metal-free approach to the Strecker reaction for amino acid synthesis.
5. Emerging reaction chemistries: DMSO is increasingly applied in radical chemistry, including photo redox and electrochemical processes, as well as in transition-metal catalysis and cross-coupling reactions.
6. Sulfur Ylide Formation: DMSO reacts with methyl iodide to form trimethylsulfoxonium salts, yielding active ylides for epoxide creation.
7. Elimination & Debromination: DMSO acts as a bromine scavenger and soft nucleophile to facilitate reductive eliminations.

Exclusive packaging, stock, and supply through IMCD

• ISO container: 18–22 MT
• Drums: 226.8 kg net, HDPE 200L drums

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