Reaktion #1164848

Reaktionsgleichung

phosgene

5,6-dihydro-4H-pyran

→

valuable product

3,4-Dihydropyran-3-carbonyl chloride

Lösungsmittel

toluene

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.DISTILLATIONVacuum distillation at 76° C./1 mbar

Vorschrift

125 g (1.25 mmol) of phosgene gas were introduced over the course of 2.5 hours at 45°-50° C. into a solution of 84 g (1 mol) of 5,6-dihydro-4H-pyran in 50 g of toluene. The mixture was subsequently stirred at 60° C. for a further 5 hours. Work-up was carried out as described in Example 1. Vacuum distillation at 76° C./1 mbar gave 103.9 g (80%) of valuable product.

Quelle