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CAS No. : | 17374-26-4 | MDL No. : | MFCD06411399 |
Formula : | C6HBr4N3 | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | OMZYUVOATZSGJY-UHFFFAOYSA-N |
M.W : | 434.71 | Pubchem ID : | 1694 |
Synonyms : |
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Chemical Name : | 4,5,6,7-Tetrabromo-1H-benzo[d][1,2,3]triazole |
Signal Word: | Warning | Class: | N/A |
Precautionary Statements: | P261-P305+P351+P338 | UN#: | N/A |
Hazard Statements: | H302-H315-H319-H335 | Packing Group: | N/A |
GHS Pictogram: |
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* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
68% | With bromine; nitric acid; at 60 - 80℃; for 49h; | General procedure: A slightly modification of the previously described procedure [39] was used. 1H-Benzimidazole (31, 3g) or 193 1H-benzotriazole (32, 3g) was dissolved in a mixture of 69% 194 HNO3 (50mL) and 100% HNO3 (3mL). Next, the solution was heated to a temperature of 80C and 195 Br2 (6 equiv.) was added drop by drop within 1h. The reaction mixture was then vigorously stirred at 60C for 48h, and after this time it was cooled to room temperature, the excess of unreacted Br2 was removed in the flow of 196 nitrogen and trapped in a 20% aqueous solution of 197 Na2S2O5 (100mL). Next, the content of the flask was poured into mixture of ice-cold 15 H2O (200mL) and saturated aqueous solution of Na2S2O5 (10mL). The resulting orange precipitate was filtered off and washed with H2O (50mL) and EtOH (50mL). The resulting crude product was washed several times with hot MeOH (50mL) yielding 198 4,5,6,7-tetrabromo-1H-benzimidazole (TBBi, 33, 5.56g, 12.82mmol, 50%) or 4,5,6,7-tetrabromo-1H-benzotriazole (TBBt, 34, 7.45g, 17.14mmol, 68%) as white solids, respectively. The identity of both polybrominated products (33 and 34) was confirmed by high-resolution mass spectrometry (HRMS). The 1H, 13C NMR and melting point values were consistent with the literature data. For 48 TBBi 33: white solid; mp 339-340C (MeOH) [339C (no data)] [88]; HRMS (ESI-TOF) m/z: [M+H]+ Calcd for C7H3Br4N2+ m/z: 434.6983, Found 434.7024; [2M+H]+ Calcd for C14H5Br8N4+ m/z: 868.3893, Found 868.4806. For TBBt 34: white solid; mp 264-266C (MeOH) [262-266C (acetic acid)] [89]; HRMS (ESI-TOF) m/z: [M+H]+ Calcd for C9H7Br5N3+ m/z: 435.6941, Found 435.6629. |
59% | With bromine; nitric acid; at 60 - 80℃; for 49h;Inert atmosphere; Irradiation; | 1H-Benzotriazole 4 (6 g, 50.4 mmol) was dissolved in a mixture of 69% HNO3 (150 mL) and fuming 100% HNO3 (10 mL). Next, the solution was heated to a temperature of 80 C and Br2 (48.3 g, 302 mmol, 15 mL) was added dropwise within 1 h. The reaction mixture was stirred vigorously using mechanical stirrer at 60 C for 48 h and irradiated by exposure to UV light. Subsequently, content of the flask was cooled to room temperature, the excess of unreacted bromine was removed in the gentle flow of nitrogen and trapped into a 20% solution of sodium pyrosulfite (150 mL). The suspension was poured into mixture of ice-cold H2O (300mL) and saturated Na2S2O5 (20mL). The resulting yellowish precipitate was filtered off, and washed with H2O (100mL) and EtOH (100mL), respectively. The obtained crude product was refluxed several times in the mixture of MeOH (50mL) and i-PrOH (25mL), and hot saturated solution was filtered off yielding white crystals 5 (13g, 29.9mmol, 59%). The purity of the compound 5 was confirmed by high-resolution mass spectrometry (HRMS). The 1H, 13C NMR and m.p. were consistent with the literature data [46]. White solid; mp 264-266C; Rf [CHCl3/MeOH (99:1, v/v)] 0.16; HRMS (ESI+, m/z): [M+H]+calcd=435.6941, [M+H]+found=435.6629. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
71% | With potassium carbonate; In acetone; at 20℃; for 24h; | To a solution of TBBt (0.31 g, 0.71 mmol) in acetone (7 mL), chloroacetone (0.114 mL, 1.42 mmol) and anhydrous potassium carbonate (0.20 g, 1.42 mmol) were added. The mixture was stirred at r.t. for 24 h, then solvent was removed in vacuo and diluted aqueous solution of potassium carbonate (15 mL) was added. The precipitate was filtered out, washed with water and dried. The product was obtained as white crystals (0.25 g, 71%). Mp 264-265 C. Rf = 0.29 (dichloromethane). 1H NMR (400 MHz, DMSO-d6) (delta, ppm): 4.94 (t, 2H, CH2); 2.18 (s, 3H, CH3). 13C NMR (100 MHz, DMSO-d6) (delta, ppm): 205.29; 142.36; 125.55; 113.52; 51.84; 29.85. HRMS calculated for C9H4Br4N3O [M-H]-: m/z 489.7047; found: 489.6948. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
70% | With potassium carbonate; In acetone; at 20℃; for 96h; | To a solution of TBBt (0.80 g, 1.84 mmol) in acetone (20 mL) 1-butene-3-on (0.2 mL, 2.40 mmol) and potassium carbonate (0.06 g, 0.43 mmol) were added. The mixture was stirred for 96 h at r.t., then solvent was removed in vacuo and diluted aqueous solution of potassium carbonate was added. The precipitate was filtered off, washed with water and dried. The product was obtained as pale yellow crystals (0.65 g, 70%). Mp 177-178 C. Rf = 0.21 (dichloromethane). 1H NMR (400 MHz, CDCl3) (delta, ppm): 5.02 (t, 2H, 3J = 7.0 Hz, NCH2); 3.35 (t, 2H, 3J = 7.0 Hz, CH2CO); 2.29 (s, 3H, COCH3). 13C NMR (100 MHz, CDCl3) (delta, ppm): 204.14; 143.16; 126.50; 113.74; 51.83; 42.00; 30.15. HRMS calculated for C10H8Br4N3O [M+H]+: m/z 505.7360; found: 505.7382. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
32% | With potassium carbonate; In acetone; for 48h;Reflux; | To a solution of TBBt (0.96 g, 2.21 mmol) in acetone (15 mL) butylene oxide (2.0 mL, 23 mmol) and potassium carbonate (0.1 g, 0.72 mmol) were added. The mixture was heated under reflux for 24 h and butylene oxide was added again (0.6 mL, 6.9 mmol) and the mixture was heated for subsequent 24 h. The solvent was removed in vacuo and the residue was mixed with water (20 mL) and extracted with dichloromethane (20 mL) twice. The organic layers were combined, washed with brine and dried over anhydrous magnesium sulfate (MgSO4). Then solvent was removed in vacuo and the residue was separated by column chromatography (dichloromethane-methanol, 99:1) to give product as white crystals (0.36 g, 32%). Mp 138-141 C. Rf = 0.14 (dichloromethane); 0.70 (dichloromethane-methanol, 99:1). HPLC(c) tR = 24.0 min (50%), tR = 33.3 min (50%). 1H NMR (400 MHz, CDCl3) (delta, ppm): 4.83 (dd, 1H, 2J = 13.6 Hz, 3J = 2.8 Hz, NCH2); 4.70 (dd, 1H, 2J = 13.6 Hz, 3J = 8.4 Hz, NCH2); 4.27-4.31 (m, 1H, CHOH); 1.59-1.69 (m, 2H, 3J = 7.6 Hz, 3J = 6.0 Hz, CH2CH3); 1.08 (t, 3H, 3J = 7.6 Hz, CH3). 13C NMR (100 MHz, CDCl3) (delta, ppm): 143.28; 126.88; 113.88; 71.78; 62.66; 27.58; 9.84. MS calculated for C10H10Br4N3O [M+H]+: m/z 507.7516; found: 507.7523. |