1,1',3,3',5,5',6,6'-Octamethyl-1,1',3,3'-tetrahydro-2,2'-spirobi[benzo[d]imidazole] CAS 99643-38-6
| CAS No. | 99643-38-6 |
| Molecular Formula | C21H28N4 |
| Molecular Weight | 336.47 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
1,1',3,3',5,5',6,6'-Octamethyl-1,1',3,3'-tetrahydro-2,2'-spirobi[benzo[d]imidazole] (CAS 99643-38-6), molecular formula C21H28N4 and molecular weight 336.47 g/mol, is a CATO reference standard with documented purity and traceability.
Structurally, 1,1',3,3',5,5',6,6'-Octamethyl-1,1',3,3'-tetrahydro-2,2'-spirobi[benzo[d]imidazole] (C21H28N4) contains a nitrogen-containing heterocyclic scaffold, a nitrile group. The molecule exhibits a degree of unsaturation (DBE) of 10.0, corresponding to approximately 10 ring(s) or double-bond equivalent(s). With a molecular weight of 336.47 g/mol, it falls into the moderately-high-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.
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 | C21H28N4 |
| Molecular Weight | 336.47 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light |
| Solubility (reference) | Soluble in DMSO, DMF, methanol |
| Stability | Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 10.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1985 |
| Nitrogen Atoms | 4 |
Related Octamethyl Standards
- 2,2,3,3,9,9,10,10-Octamethyl-4,8-dioxa-3,9-disilaundecan-6-ol (CAS 85951-09-3)
- 2,2,3,3,9,9,10,10-Octamethyl-4,8-dioxa-3,9-disilaundecan-6-amine (CAS 188538-25-2)
- 2,2,3,3,9,9,10,10-OCTAMETHYL-4,8-DIOXA-3,9-DISILAUNDECAN-6-ONE (CAS 127382-65-4)
- Octamethyl trisilicate (CAS 4221-95-8)
- 2,2,3,3,9,9,10,10-Octamethyl-4,8-dioxa-3,9-disilaundecane (CAS 82112-22-9)
- 1,1,4,4,5,5,8,8-Octamethyl-1,2,3,4,5,6,7,8-octahydroanthracene (CAS 22306-30-5)
- 2,2,3,3,8,8,9,9-Octamethyl-4,7-dioxa-3,8-disiladecane (CAS 66548-22-9)
- 1,1,4,4,7,7,10,10-Octamethyl-2,3,4,7,8,9,10,12-octahydro-1H-dibenzo[b,h]fluorene (CAS 77308-48-6)
Recommended Standards
- (Z)-7-((1R,2R)-2-((S,E)-3-Hydroxyoct-1-en-1-yl)-5-oxocyclopentyl)hept-5-enoic acid (CAS 35536-53-9)
- 15-epi Prostaglandin A1 (CAS 20897-92-1)
- (8AR,9R,10R,11aR,Z)-10-hydroxy-9-((S,E)-3-hydroxyoct-1-en-1-yl)-4,5,8,8a,9,10,11,11a-octahydrocyclopenta[b]oxecin-2(3H)-one (CAS 55314-48-2)
- 1-Benzyl-4-((5-methylthiophen-2-yl)sulfonyl)piperazine (CAS 620104-14-5)
- 1-[2-(trifluoromethoxy)phenyl]-1H-pyrrole (CAS 259269-59-5)
- 6-methoxy-3-propylbenzo[d]thiazol-2(3H)-imine hydroiodide (CAS 2034154-71-5)
- 7-Bromo-1-isopropyl-3,4-dihydroisoquinoline (CAS 371220-28-9)
- 2-(2-Methyl-4-(2,4,5-trimethylphenyl)thiazol-5-yl)acetic acid (CAS 552854-97-4)
- (R)-3-amino-4-(thiophen-2-yl)butanoic acid hydrochloride (CAS 332061-91-3)
- Cefotaxime Impurity 23 (CAS CATO-C4X-120123)
- 4-(5-Methylfuran-2-carbonyl)morpholine-2-carboxylic acid (CAS 1306772-75-7)
- methyl 4-chloro-6-iodoquinoline-2-carboxylate (CAS 927426-63-9)
- 8-hydroxy-1,6-naphthyridine-7-carboxylic acid (CAS 410542-70-0)
- [y-Glu15]-Semaglutide Impurity 134 (CAS CATO-C4X-2226134)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
- Worldwide shipping with full export documentation (HS code guidance available)
- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com