1,1,1-Trifluoro-4-Iodobutane vs 1-Iodo-4,4,4-Trifluorobutane: Clarifying Nomenclature, Specifications, and Quality Implications
- Nomenclature matters: Both names refer to the same compound (CAS 461-17-6), but inconsistent naming can cause confusion in COA interpretation and regulatory documentation.
- Industrial purity & stability are highly dependent on synthesis route and post-processing—critical for fluorinated intermediates used in pharmaceutical APIs.
- When sourcing high-purity 1-Iodo-4,4,4-trifluorobutane, verify assay consistency, moisture control, and stabilizer protocols from a trusted global manufacturer.
In the world of fluorinated organic synthesis, precise chemical identification is non-negotiable. Buyers and process chemists often encounter two seemingly distinct names: 1,1,1-trifluoro-4-iodobutane and 1-Iodo-4,4,4-trifluorobutane. Despite the different phrasing, both refer to the exact same molecular entity—C4H6F3I—with CAS number 461-17-6. The variation stems solely from IUPAC naming conventions: one emphasizes the trifluoromethyl group at carbon 1, while the other highlights the iodo substituent at carbon 1. Chemically, they are identical.
Nomenclature Clarification: Are They the Same Compound?
Yes. Both 1,1,1-trifluoro-4-iodobutane and 1-Iodo-4,4,4-trifluorobutane describe a linear four-carbon chain where the terminal carbon (C1) bears an iodine atom, and the opposite terminal carbon (C4) carries three fluorine atoms—hence the “4,4,4-trifluoro” designation. This structural symmetry means that regardless of naming preference, the compound’s reactivity, boiling point (~128°C), molecular weight (237.99 g/mol), and functional behavior in cross-coupling or nucleophilic substitution reactions remain unchanged.
However, inconsistency in naming across suppliers’ Certificates of Analysis (COA) can create compliance risks, especially in regulated industries like pharmaceuticals. A procurement team might unknowingly reject a valid batch if the COA lists “1,1,1-trifluoro-4-iodobutane” while their internal specification calls for “1-Iodo-4,4,4-trifluorobutane”—even though both are chemically indistinguishable.
Comparative Analysis of Assay, Moisture, and Stability Data
While the identity is consistent, industrial purity and batch-to-batch reliability vary significantly based on the manufacturing process and post-synthesis handling. High-quality 1-Iodo-4,4,4-trifluorobutane must meet stringent criteria beyond just ≥98% GC assay. Key quality markers include:
- Moisture content: Should be ≤0.1% to prevent hydrolysis or HI formation.
- Stabilization: Often stabilized with copper powder or other radical inhibitors to suppress I2 liberation under light or heat.
- Color and clarity: Premium grades appear colorless to pale yellow; darkening indicates decomposition.
- Residual solvents: Must comply with ICH Q3C guidelines for use in API synthesis.
The synthesis route also impacts impurity profiles. Common industrial methods involve nucleophilic substitution of 4,4,4-trifluorobutanol with iodinating agents (e.g., PI3 or NaI/H3PO4), followed by rigorous distillation. Inefficient purification can leave behind alcohols, alkenes, or diiodo byproducts that compromise downstream reaction yields.
As a premier global manufacturer, NINGBO INNO PHARMCHEM CO.,LTD. employs a proprietary, scalable synthesis route that ensures >99% assay (by GC), moisture <0.05%, and long-term stability under ambient storage—critical for multi-ton campaigns in agrochemical and pharmaceutical manufacturing.
Specification Comparison: Industry Benchmarks vs. Premium Supply
| Parameter | Basic Commercial Grade | Premium Industrial Grade (NINGBO INNO PHARMCHEM CO.,LTD.) |
|---|---|---|
| Assay (GC) | ≥98.0% | ≥99.0% |
| Moisture (KF) | ≤0.2% | ≤0.05% |
| Appearance | Pale yellow liquid | Colorless to very pale yellow liquid |
| Stabilizer | Copper turnings (variable) | Controlled copper stabilization (consistent batch protocol) |
| Bulk Price (FOB China) | Highly variable; often lacks transparency | Competitive bulk price with volume scalability (MOQ 1 kg to multi-ton) |
| COA Detail | Limited analytical data | Full COA with NMR, GC, KF, residual solvents, and heavy metals |
Impact of Naming Variants on COA Interpretation and Regulatory Compliance
Regulatory submissions (e.g., DMFs, CEPs, or INDs) require absolute consistency in chemical nomenclature. If a supplier’s COA uses “1,1,1-trifluoro-4-iodobutane” but your regulatory filing specifies “1-Iodo-4,4,4-trifluorobutane,” auditors may flag it as a discrepancy—even though both are correct. To mitigate this, leading manufacturers like NINGBO INNO PHARMCHEM CO.,LTD. provide dual-nomenclature labeling and harmonized documentation aligned with ICH and FDA expectations.
Moreover, when evaluating a COA for 1-Iodo-4,4,4-trifluorobutane, always verify:
- That the CAS number is unequivocally 461-17-6
- That the analytical methods (GC conditions, column type, internal standard) are disclosed
- That stability data supports shelf life under recommended storage (cool, dark, inert atmosphere)
For B2B buyers engaged in complex synthesis—such as preparing fluorinated building blocks for kinase inhibitors or PET tracers—the reliability of the starting material directly influences final yield and purity. Compromising on industrial purity or inconsistent manufacturing process controls can cascade into costly reprocessing or failed validation batches.
In summary, while 1,1,1-trifluoro-4-iodobutane and 1-Iodo-4,4,4-trifluorobutane are chemically identical, the real differentiator lies in the supplier’s technical rigor, analytical transparency, and scale-up capability. For guaranteed performance in high-value applications, partner with a vertically integrated producer who controls the entire value chain—from raw materials to final distillation.
When sourcing high-purity 1-Iodo-4,4,4-trifluorobutane, ensure your supplier delivers not just the molecule, but the documentation, consistency, and technical partnership required for modern synthetic chemistry.