| Popis: |
Relative retention data are reported for biphenyl, naphthalene, seven fluorine substituted biphenyls (bearing 1, 2, 8, and 10 fluorine atoms per molecule), and mono- and octafluoronaphthalenes in gas chromatography with (a) silicone fluid DC 710, (b) Carbowax 20M, and (c) Bentone 34-silicone fluid DC 710 and in thin-layer chromatography on (d) silica gel and (e) alumina. With a and d retention generally decreases with increasing number of fluoro substituents, n , and, for a given n , is higher for a biphenyl compound than for a naphthalene one. 2,2′-Difluorobiphenyl is an exception in d, since it has the smallest R F of the various solutes. Some irregularities in these trends are found in cases b, c and e. |
