4-ethynyl-2,3-dihydro-1H-isoindole-1,3-dione CAS 1909309-81-4
| CAS No. | 1909309-81-4 |
| Molecular Formula | C10H5NO2 |
| Molecular Weight | 171.15 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Structurally, 4-ethynyl-2,3-dihydro-1H-isoindole-1,3-dione (C10H5NO2) contains an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage. The molecule exhibits a degree of unsaturation (DBE) of 9.0, corresponding to approximately 9 ring(s) or double-bond equivalent(s). With a molecular weight of 171.15 g/mol, it falls into the medium-molecular-weight range. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
4-ethynyl-2,3-dihydro-1H-isoindole-1,3-dione (CAS 1909309-81-4) is a high-purity analytical reference standard with the molecular formula C10H5NO2 and a molecular weight of 171.15 g/mol.
This reference standard is suitable for quantitative analysis on major chromatographic platforms including HPLC, GC, LC-MS/MS, and GC-MS, serving as an external calibration standard or a system suitability test reference material.
The assigned purity is verified by mass-balance and quantitative NMR (qNMR) approaches, with the expanded uncertainty reported at a 95% confidence level (k=2). Batch homogeneity and stability are independently assessed for every lot.
Physical & Chemical Properties
| Molecular Formula | C10H5NO2 |
| Molecular Weight | 171.15 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (faint amine-like odor) |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light |
| Solubility (reference) | Soluble in chloroform, dichloromethane, ethyl acetate, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 9.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1995 |
| Nitrogen Atoms | 1 |
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Recommended Standards
- 2-[1-(2,2-Difluoroethyl)-1H-pyrazol-5-yl]acetonitrile (CAS 1823789-71-4)
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- (1,3,5-Triazine-2,4,6-triyl)trimethanol (CAS 35045-13-7)
- 2-chloro-5-methylpyridine-4-carbonitrile (CAS 1261685-10-2)
- 4-Bromophthalonitrile (CAS 70484-01-4)
- (2E)-2-[(E)-2-(2,4-Difluorophenoxy)pyridine-3-carbonyl]-3-(dimethylamino)prop-2-enenitrile (CAS 1164505-67-2)
- 2-Bromophenethyl quinoline-4-carboxylate (CAS 313241-21-3)
- 6-Bromo-N-hydroxy-2H-1,4-benzoxazin-3-amine (CAS 1219717-21-1)
- 5-Chloro-4-methyl-3-(tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-amine (CAS 2377611-67-9)
- 3-(2-Methoxybenzylidene)pyrrolidin-2-one (CAS 1859-44-5)
- Ertapenem Impurity C90 (CAS 87691-27-8)
- 4-Amino-5-chloro-1,3-benzodioxole (CAS 379228-45-2)
- Des-Pro36-37-Tirzepatide (CAS CATO-CPTD788938)
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