HuagongsheHuagongshe Chemistry Print Report · For research reference only
Allyl bromide → 5-Methyl-7-(2-propen-1-yloxy)-2H-1-benzopyran-2-one
Participants
| Role | Name | HCID | Charge |
|---|---|---|---|
| Reactant | Allyl bromide | HCID 7841 | — |
| Reactant | Potassium Carbonate | HCID 11430 | — |
| Reactant | 7-hydroxy-5-methylcoumarin | HCID 5355639 | — |
| Product | 5-Methyl-7-(2-propen-1-yloxy)-2H-1-benzopyran-2-one | HCID 12900442 | — |
Reaction Steps
A Me2CO (250 ml) solution of 5-methyl-7-hydroxycoumarin (I; 15.0 g) was reacted with allyl bromide (20 ml) in the presence of K2CO3 (5.0 g) by refluxing the mixture for 5 hours. After chilling the K2CO3 is filtered off and washed with fresh Me2CO. The pooled filtrate and acetonic washings were concentrated to dryness and the residue crystallized from cyclohexane giving 5-methyl-7-allyloxycoumarin (IV; 13.8 g; m.p. 83° ). ##STR7##
Provenance & Evidence
| DOI | 10.6084/m9.figshare.5104873.v1 |
|---|---|
| Patent number | US04312883 |
| Source dataset | uspto-grants-1982_01 |
| ORD ID | ord-2c2741665dd24a78b389915e527ee9d4 |
| Source note | uspto-grants-1982_01 |