S. Kobayashi et al., Preparation and thermal behavior of 3,3,4,4-tetrafluorocyclobutane-1,2-diols: A new family of cyclobutane-1,2-diols, CHEM LETT, (12), 2000, pp. 1366-1367
Thermal dimerization of 2,2-diftuoro enol silyl ethers led to 3,3,4,4-tetra
fluorocyclobutanes. The [2+2] cycloaddition proceeded in a "head-to-head" f
ashion to afford the cyclobutanes containing the trans and cis stereoisomer
s. The cyclobutanes were transformed to tetrafluorocyclobutane-1,2-diols by
desilylation.