How is 1-Heptanesulfonyl fluoride, 1,1,2,2,3,3,4,4,5,5,6,6,7,7,7-pentadecafluoro- (CAS: 335-71-7) typically synthesized?

This compound can be synthesized via a multi-step process involving the protection of a heptanesulfonyl chloride, followed by the introduction of fluorine atoms using a fluorinating agent like difluorosulfuric acid. Common synthetic methods include the use of Friedel-Crafts type reactions and selective fluorination techniques to achieve the desired fluorinated product.