HuagongsheHuagongshe Chemistry Print Report · For research reference only
Piperazine → HCID 20086571, compound
Participants
| Role | Name | HCID | Charge |
|---|---|---|---|
| Reactant | Piperazine | HCID 4837 | — |
| Reactant | 1,1'-Carbonyldiimidazole | HCID 68263 | — |
| Reactant | HCID 10469565 | HCID 10469565 | — |
| Solvent | 1,1-Dichloroethane | HCID 6365 | — |
| Product | HCID 20086571 | HCID 20086571 | — |
Reaction Steps
2.7 g (0. 009 mol) of 3,4-dihydro-6-acetoxy-2,5,7,8-tetramethyl-2H-1-benzopyran-2-carboxylic acid are dissolved in 200 cm3 of anhydrous dichloroethane. 1 eq of carbonyldiimidazole (0.009 mol), i.e. 1.5 g, is added. The mixture is left to stir for 1 h and then 7.5 g of piperazine (0.009 mol) dissolved in 200 cm3 of dichlorcethane are added. The oil obtained after evaporation is purified on a silica column by eluting with a CH2Cl2 /ethanol/NH4OH (88/10/2) mixture and crystallized from isopropyl ether.
Provenance & Evidence
| DOI | 10.6084/m9.figshare.5104873.v1 |
|---|---|
| Patent number | US05395834 |
| Source dataset | uspto-grants-1995_03 |
| ORD ID | ord-66a15d2cd23e4ab980d18cf43034cf7c |
| Source note | uspto-grants-1995_03 |