B R I E F S

Determination of Carboxyl ic Acid Hydrazides by Titration of the Acidic Hydrazones Formed with 2,4-Dichlorobenzaldehyde

The method involves reacting the hydrazide with 2,4-dichlorobenzaldehyde to form the hydrazone, which is subsequently titrated as an acid in pyridine with tetra-butylammonium hydroxide.

ALBERT A. LATOUR, EDWARD J . KUCHAR. and SIDNEY SIGGIA, Olin Research Center, Olin Mathieson Chemical Corp., New Haven 4, Conn.

Anal. Chem. 36, 2479 (1964)

Falling Ball Viscometry. An Instrument for Precise Measurements

The instrument uses electronic timing and small steel balls and is sensitive enough to measure fall times of ViH-inch stainless steel balls with a precision similar to I hat obtained in capillary viscometry.

W. K. LIM, H. W . J O H N S O N , Jr., P. C. WILHELMSEN, and F. H. STROSS, Shell Development Co., Emeryville, Calif.

Anal. Chem. 36, 2482 ( 1964)

Structure and Behavior of Organic Analyt ical Reagents . Formation Constants of Transition Metal Complexes of 2-Hydroxypyridine-l -Oxide and 2-Mercaptopyridine- l -Oxide

The acid dissociation constants and the chelate formation constants of the two compounds with M n ( I I ) , Co( I I ) , K i ( I I ) , Cu( I I ) , and Zn(II) were determined potentio-metrically and spoctrophotometrically.

PENG-JOUNG SUN, QUINTUS FERNANDO, and HENRY FREISER, Department of Chemistry, University of Arizona, Tucson, Ariz.

Anal. Chem. 36, 2485 (1964)

Quanti tat ive Conversion of Molybdate to Mo(V) by the Stannous Chloride-Perchlorate Reaction and Spectrophotometr ic Determination of Tri-caprylylmethylammonium Oxyte trath iocyanato-molybdate (V)

Removal of excess stannous ion by excess perchlorate previous to thiocyanate addition and development of the characteristic orange-red color of oxypentathiocyanato-molvbdatc(V), assures stable absorbance of this complex in (he aqueous phase up to one hour and in the quater­nary-chloroform extract up to 24 hours.

A. M. WILSON, Department of Chemistry, Emory University, Atlanta, Ga . 30322, O . K. McFARLAND, Department of Chem­istry, Wayne State University, Detroit 2, Mich.

Anal. Chem. 36, 2488 ( 1964)

4-Methoxy-a-Naphthol as a Spectrophotometr ic Reagent Substrate for Measuring Peroxidatic Act iv i ty

With the described procedure, 0.010 to 0.700 unit /ml of peroxidase, 0.00550 to 0.220, and 0.000330 to 0.00666 unit / ml. of glucose oxidase and xanthine oxidase were assayed with standard deviations of 1.9, 1.8, and 1.6, respectively.

GEORGE G. GUILBAULT and DAVID N. KRAMER, Detection Research Branch, Defensive Research Division Directorate of De­fensive Systems, CRDL, Edgewood Arsenal, Md.

Anal. Chem. 36, 2494 ( 1964)

No. ^jlh in the

ADVANCES IN

CHEMISTRY

SERIES

BORAX

TO

BORANES With preface by

PROFESSOR THOMAS WARTIK Pennsylvania State University

This is a collection of 27 papers given at two ACS symposia (1958 and 1959) on the production of boron hydrides from borax, and on the chemistry of the boranes. Five papers are included on the fund­amental chemistry of boron, and one on the history of this e lement and its compounds .

Among the applications of boron and the boranes discussed in this definitive monograph are those to nuclear reactors, "exotic" jet engine and rocket fuels, and semiconductors . Boron is, because of its electronic structure, an extremely versatile ele­ment and forms a great variety of compounds of potential but unrealized usefulness.

Boron chemistry is one of the new frontiers in organo-inorganic chemistry. Therefore, this vol­ume is of interest and importance to chemists in any of the fundamental fields, as well a s to special­ists in the theory of valency, crystal structure, metallo-carbon compounds , the chemistry of ex­plosion, and the history of chemistry.

244 pages.

Order from:

Paper b o u n d . Price: $5.00

Special Issues Sales, American Chemical Society 1155 Sixteenth Street, N. W., Washington 6, D. C.

-Circle No. 117 on Readers' Service Card VOL. 36, NO. 13, DECEMBER 1964 · 15 A