반응 #6629

반응 방정식

phenyl-3-methylbut-2-enylsulfide

Compound 60

phenyl-3-methylbut-2-enylsulfide

phosphorus pentoxide

phosphoric acid

benzene

→

title compound

4,4-Dimethylthiochroman

반응 조건

후처리

1. 1
   온도This solution was refluxed
2. 2
   기타The supernatant organic layer was decanted
3. 3
   추출the syrupy residue extracted with 3×50ml ether
4. 4
   세척washed with water, saturated NaHCO3 and saturated NaCl solutions
5. 5
   건조dried (MgSO4)
6. 6
   기타Solvent was removed in vacuo
7. 7
   workup.DISTILLATIONthe residue purified by kugelrohr distillation (80 degrees C., 0.5mm)

실험 절차

To a solution of 15.48g (86.824 mmol) of phenyl-3-methylbut-2-enylsulfide (Compound 60) in 160ml benzene were added successively 12.6g (88.767mmol) of phosphorus pentoxide and 11 ml of 85% phosphoric acid. This solution was refluxed with vigorous stirring under argon for 20 hours, then cooled to room temperature. The supernatant organic layer was decanted and the syrupy residue extracted with 3×50ml ether. Organic fractions were combined and washed with water, saturated NaHCO3 and saturated NaCl solutions and then dried (MgSO4). Solvent was removed in vacuo and the residue purified by kugelrohr distillation (80 degrees C., 0.5mm) to give the title compound as a pale yellow oil. PMR (CDCl3) :& 1.30 (6H, s), 1.90-1.95 (2H, m), 2.95-3.00 (2H, m), 6.96-7.00 (2H, m), 7.04-7.07 (1H, m), 7.30-7.33 (1H, m).

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