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triacylamines, and hydrazides. The thiono analogues of the compounds were also discussed. This volume contains an author index and a subject index.
Infrared Vapour Spectra. D. Welti, xi + 211 pages. Sadtler Research Lab oratories, 3314-20 Spring Garden St., Philadelphia, Pa. 19104. 1970. $21
This book contains an extensive com pilation of vapor-phase spectra. The preparation of this book stems from the author's interest in the combination of infrared spectrometry with vaporphase chromatography. The direct col lection and examination of chromato graphic fractions in the vapor phase, usually in a heated gas cell, is a simple and efficient operation. The only sub stantial problem that remained in its application as a method of identifica tion of unknowns was the lack of good quality vapor-phase spectra in the lit erature, and a relative lack of knowl edge of the differences to be expected between the spectrum of the vapor and the condensed phase. Not only has Mr. Welti compiled a list of vapor-phase spectra, but he has examined relatively complex materials in the vapor phase, particularly those in which intermolecular hydrogen bonding can occur. The following are the five main topics cov ered in this book: sample handling; frequency correlations of vapor spec tra ; introduction to the use of the band contours in vapor spectra; combination of gas chromatography and infrared spectrometry; and vapor spectra. An index to the vapor spectra is also in cluded.
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Masking and Demasking of Chemical Reactions. D. D. Perrin. χ + 211 pages. John Wiley & Sons, Inc., 605 Third Ave., New York, Ν. Υ. 10016. 1970. $12.95
Masking and demasking techniques arc used to improve selectivity in chem ical methods ranging over fields as di verse as complexometric titration, gravimetry, polarography, spectrophotom etry, solvent extraction, and ion ex change. This book provides a timely condensation of representative applica tions relevant to analytical chemistry, industry, biology, and medicine. The underlying principles of masking are discussed to servo as a guide to the reader in his choice of masking reagents for use in new systems or under condi tions not previously considered. This detailed guide to masking as ap proached is unique, since previous pub-
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Circle No. 168 on Readers' Service Card ANALYTICAL CHEMISTRY, VOL. 43, NO. 1, JANUARY 1971 ·
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