The Miscibility of some Pyridine Homologues with Water.

The miscibility of the picolines and of three lutidines with deuterium oxide is studied. a-Picoline is only partially miscible (see also Timmermans and Poppe, Compt. rend., 1935, 201, 608) as also-is P-picoline; y-picoline is completely miscible. The partial miscibility of P-picoline with deuterium oxide affords a simple method of analysing deuterium oxide-water mixtures, and a suitable procedure is suggested.

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Karr, " Physical Properties of Low-Boiling Phenols. the Interior, 1957, Information Circular 7802. F. p. 99.929 & 0.006 0.848" f 0.004" 40.84" f 0.01" F. p. 99.963 f 0.002 0-596 f 0.009 30.97 f 0.01 M. p. 99.917 & 0.020 0.749 f 0-040 12-16 f 0.01 F. p-99.963 f 0.021 0.915 f 0.051 34-65 f 0.01 M. p. 99.928 f 0.005 0.502 f 0.019 72-53 f 0.01 M. p. 99.972 f 0.002 0.576 f 0.030 24.52 f 0.01 M. p. 99.896 f 0.020 0.727 f 0.008 74.77 f 0.01 F. p. 99.886 f 0.008 0-558 f 0-016 45.56 f 0.01 M. p. 99.971 & 0.005 0.727 f 0.020 65-09 f 0.01 M. p. 99.960 f 0.004 0.520 f 0.059 63.24 f 0.01 I;. p. €or 100% purity 40.90" f 0.01" 30.99 & 0.01 34.69 -J= 0.02 72.57 f 0.02 24.54 & 0.01 74.85 f 0-02 45-62 & 0.01 65.11 f 0-01 63.27 f 0.02 (tf, 0 ) f 0-02Vapour pressure-temperature relationships, normal boiling points, values of (dtldp) 760 mm., and latent heats of vaporization. The vapour pressures of the liquid and solid xylenols were measured by ebulliometric and gas-saturation procedures previously described.4~ 1 3 ~~4 Detailed results for the six xylenols are given in Table 2.Antoine equations [i.e., equations of the form log,, P = A -B/(t + C)] were fitted to the data for higher temperatures, and the two-constant equation log,, P = A -B/(t + 273) was used for the lower temperature range. Table 3 gives the constants of these equations and Table 4 shows the normal b. p.s; values of (dt/dP),so-.

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