Phenyl Isocyanate Derivatives of Certain Alkylated Phenols. Melting Points and X-Ray Powder Diffraction Data

Abstract

As positive means for identifying alkylated phenols, the authors have prepared phenyl isocyanate derivatives of a large number of phenols, and in this paper present tables of melting points and x-ray powder diffraction data. ASA result of recent developments, considerable quantities of alkylated phenols are finding use in the preparation of synthetic plastics, rubber, germicides, fungicides, and related substances. Because of this increasing interest in alkylated phenols, the authors have undertaken to develop an easy and positive means for their identification. One widely used method for such purposes is the determination of the characteristic melting point of the aryl N-phenylcarbamate formed by the reaction of a phenol with phenyl isocyanate. As this procedure has been shown to be authors No. formula Name 29 C»HnO 2-Cyclohexylphenol 111.5 30 CiiHuO 4-Cyclohexylphenol 145.5 31 CiiHuO 2-tert-A myl-4-methylphenol 4 (or 6)-<er/-Butyl-3ethylphenol (b.p. 142°C. at 20 mm.

Phenol Derivatives

“…In the case of sterically hindered phenols, conditions have to be modified as with etherification [24]. With the exception of 2,6-di-tert-alkylphenols the hydroxyl groups of the alkylphenols react with isocyanates to form urethanes, which can be used for identification of the alkylphenols [28].…”

Precision in X-Ray Spectrochemical Analysis. Fixed-Time vs. Fixed-Count.

“…= 100(7¿2AVl + 7b2/A l)1,2/{Il -Ib) (10) Again substituting 7s2 = x2 7A, Equation 10 becomes {aL -s)%f.c. = 1007 ~1/2 (1 + z2)1'2/ (7z, -7S) (11) What is the ratio of precision for fixedtime-fixed-count? For simplicity, write at for ( £_ %) .…”

Identification of Mercaptans and Disulfides by X-Ray Diffraction of Their Respective 2,4-Dinitrophenyl Thioethers.

“…It is only within the past 15 years that x-ray diffraction has been used to any great extent for the identification of organic compounds. Aldehydes and ketones (5,6,8), carboxylic acids (12,13,16), alcohols (7,16), amines (1, 2, 9), and phenols (10,11) have been studied by this technique with excellent results. A need was felt, therefore, to extend this technique to the identification of organic compounds containing other functional groups.…”