2,4,6-Tris[(pentafluorothio)methyl]-1,3,5-trioxane

In studying molecular systems containing the pentafluorothio (SF{sub 5}) group, it was found to be necessary to synthesize SF{sub 5}CH{sub 2}CHO to serve as a precursor for pentafluorothio hydrocarbon derivatives. The vinyl ether F{sub 5}SCH = CHOCH{sub 3} was obtained from the compound F{sub 5}SCH = CHBr by treatment with methanolic sodium methoxide. The vinyl ether was then acid hydrolyzed to yield (SF{sub 5}CH{sub 2}CHO){sub 3}. Results of {sup 1}H and {sup 19}F NMR spectral studies of both the monomeric and trimeric form of the trioxane are presented. The data do not indicate isomerization in the trimer, and the crystal structure of the trimer indicated 3-fold symmetry in which the trioxane ring is situated in a chair-type conformation. 11 refs., 1 fig., 3 tabs.