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the size of the ortho-alkyl substituents parallels changes in other constants derived from the same structural differences, as may be seen from the data in Table IV. Again, only limited comparable data are available.As to the application of the HFA technique to quantitative analysis, it can be concluded that although it is applicable to most phenols, caution should be exercised in systems where there is a bulky ortho substituent or a strong electronegative group at the meta or para position. In such systems, the equilibrium does not lie too far to the right. This, however, can be partially overcome by the presence of a great excess of free HFA. For example, to reach 99% reaction in a substituted phenol whose K with HFA is 100, a 1.0 molar excess of HFA should be present.

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In the interest of prompt distribution, this manual was not edited by the Technical Information staff. Thi« rppnrt wn» prerumi ft* MI tritium oTwntk «|mnM>m1 hs tfir t'mli'il Stnlp» f»i\prnmpm Nmhtr ihe tnitrri Stm** Kritrip. Rwifiirrri titrt fFfveliiftmrni Adminitttatwrt. twr an\ i>f their empiovt-pN. mir nnv oT iht-ir tuntriirtnn, nutxurttrmlor.. or ihrir emplxven., mikni anv wirrnnty f Ipnw or implied. «r annum** flnv UttHl lialnhiv nr mponmhihrv Tor ihr nrcurary. niin|ilvlpnrw> or us*lulnt"« i» diM-ltmi'il. nr n-i'nwnl-ihat HK U»P woulrl nnt mfnnfc pnvaifh t h TABLE OF CONTENTS Laboratory No. 1. Laboratory No. 2. Laboratory No. 3. Laboratory No. hi. Laboratory No. 4B. Laboratory No. 5. Laboratory No. 6.

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