반응 #93952

반응 방정식

tetrahydro-4H-pyran-4-one

2,3-dimethyl-p-anisaldehyde

→

yellow crystals

수율 39.0%

Tetrahydro-3,5-bis[(4-methoxy-2,3-dimethylphenyl)methylene]-4H-pyran-4-one

수율 39.0%

용매

EtOH

HCl

반응 조건

후처리

1. 1
   온도heated
2. 2
   온도at reflux for 3 hours
3. 3
   기타The product gradually precipitates during this period
4. 4
   온도After cooling
5. 5
   여과this material is filtered
6. 6
   workup.ADDITIONtreated with ether

실험 절차

A solution of 6.0 g (0.06 mole) of tetrahydro-4H-pyran-4-one, 21.6 g (0.13 mole) of 2,3-dimethyl-p-anisaldehyde in 75 ml of EtOH and 10 ml of concentrated HCl is stirred and heated at reflux for 3 hours. The product gradually precipitates during this period. After cooling, this material is filtered and treated with ether to give 9.1 g (39%) of yellow crystals, m.p. 225°-227°.

출처