... The trapped volatile products and the separated organic phase were combined, washed, dried, and distilled to give 1H,4Hsctafluorobutane (32 g., 56y0), bp 39.5-40.5', and lH-4-(methylsulfonyl) octafluorobutane (10 g., 13%), bp 101" (40mm.). Anal. Calcd. ... J . Am. Chem. ...