反应详情

1000 g of distillation residue from diketene production, containing 22.0 percent of 3-acetoxy-2-cyclobuten-1-one (1.74 mol), was dissolved in 1078 ml of ethyl acetate (970 g). 707.4 g of dicyclohexylamine (98 percent; 3.81 mol) was instilled in this black solution at 10° C. within 60 minutes. After 90 minutes, of stirring at +10° C., the suspension was filtered, suspended three times with ethyl acetate and dried under vacuum 518 g of the title product with a content of 65.5 percent (HPLC), corresponding to a yield of 73.4 percent, relative to 3-acetoxy-2-cyclobuten-1-one, was obtained. Data for the title compound was:

1. distillation1000 g of distillation residue from diketene production
2. filtrationthe suspension was filtered
3. dry with materialdried under vacuum 518 g of the title product with a content of 65.5 percent (HPLC), corresponding to a yield of 73.4 percent, relative to 3-acetoxy-2-cyclobuten-1-one
4. customwas obtained