Yield:1561-52-0 83%

Reaction Conditions:

with iodine;iodine pentafluoride at 80; for 4 h;Autoclave;

Steps:

2.1

In an autoclave at room temperature I2 (34 g, 134 mmol) and CF2=CF- O- C3F7 (68 g, 254 mmol), IF5 (57 g, 254 mmol) was added. Seal the autoclave,And the mixture was heated and stirred at 80 ° C. for 4 hours. After cooling to room temperature, the autoclave was disassembled,The reaction solution was slowly added to water (100 ml). After separation, lower layer was separated with an aqueous solution containing KOH and hydrosulfite,1 (81 g, 197 mmol, yield 78%GC purity 95%. The following compounds were prepared in the same manner as in steps (I) to (IV) of Example 1 except that CF 2=CF-O-CF 3 was used in place of CF2=CF-O-C3F7.

References:

JP2017/226617,2017,A Location in patent:Paragraph 0099; 0104-0106