B R I E F S
No. ^jlh Determination of C a r b o x y l i c Acid Hydrazides by Titration of the A c i d i c Hydrazones Formed with 2,4-Dichlorobenzaldehyde
ADVANCES IN
The method involves reacting the hydrazide with 2,4dichlorobenzaldehyde to form the hydrazone, which is subsequently titrated as an acid in pyridine with tetrabutylammonium hydroxide.
CHEMISTRY SERIES
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. P r e c i s e Measurements
An
Instrument
in the
BORAX
for
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 O r g a n i c A n a l y t i c a l R e a g e n t s . Formation C o n s t a n t s of Transition Metal C o m p l e x e s of 2-Hydroxypyridine-l-Oxide and 2 - M e r c a p t o p y r i d i n e - l - O x i d e The acid dissociation constants and the chelate formation constants of the two compounds with M n ( I I ) , C o ( I I ) , K i ( I I ) , C u ( I I ) , and Zn(II) were determined potentiometrically and spoctrophotometrically. PENG-JOUNG SUN, QUINTUS FERNANDO, and HENRY FREISER, Department of Chemistry, University of Arizona, Tucson, Ariz. Anal. Chem. 36, 2485 (1964)
Q u a n t i t a t i v e Conversion of M o l y b d a t e t o M o ( V ) by t h e Stannous Chloride-Perchlorate Reaction and S p e c t r o p h o t o m e t r i c Determination of Tricaprylylmethylammonium O x y t e t r a t h i o c y a n a t o molybdate(V) Removal of excess stannous ion by excess perchlorate previous to thiocyanate addition and development of the characteristic orange-red color of oxypentathiocyanatomolvbdatc(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, G a . 30322, O . K. McFARLAND, Department of Chemistry, W a y n e State University, Detroit 2, Mich. Anal. Chem. 36, 2488 ( 1964)
4-Methoxy-a-Naphthol a s a S p e c t r o p h o t o m e t r i c R e a g e n t S u b s t r a t e for Measuring Peroxidatic Activity 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.
TO BORANES With preface by PROFESSOR THOMAS WARTIK Pennsylvania State University This is a collection of 27 p a p e r s given at two ACS symposia (1958 and 1959) on t h e production of boron hydrides from borax, and on the chemistry of the boranes. Five papers are included on t h e fundamental chemistry of boron, and one on t h e history of this e l e m e n t and its c o m p o u n d s . Among t h e applications of boron and t h e boranes discussed in this definitive monograph are t h o s e to nuclear reactors, "exotic" jet engine and rocket fuels, and semiconductors. Boron is, b e c a u s e of its electronic structure, an extremely versatile elem e n t and forms a great variety of c o m p o u n d s of potential but unrealized usefulness. Boron chemistry is one of t h e new frontiers in organo-inorganic chemistry. Therefore, this volu m e is of interest and importance to c h e m i s t s in any of t h e fundamental fields, a s well a s to specialists in t h e theory of valency, crystal structure, metallo-carbon c o m p o u n d s , t h e chemistry of explosion, and t h e history of chemistry. 244 pages.
Paper bound.
Price:
$5.00
Order from: Special Issues Sales, American Chemical Society 1155 Sixteenth Street, N. W., Washington 6, D. C.
Anal. Chem. 36, 2494 ( 1964) -Circle No. 117 on Readers' Service Card
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NO.
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DECEMBER
1964
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