THE PARR® ACID DIGESTION BOMB The
rapid
a n d safe
way to
Table I I I . Typical Computer Search Results
Sample y-Nonalactone
HF,
HC1 o r organic
strong
alkalis
acids
with
HNOs,
^7.1 95.1 95.0 94.4
l,4-Dichlorobutene-2 3,4-Dichlorobutene-l l,2-Dichlorobutene-3 l,4-Dichlorobutene-2
Pregna-4,6-dien-20a-ol3-one
100.0
Pregna-4,6-dien-20aol-3-one 16-Methyl-16-dehydropregnenolone 16-Dehydropregnenolone acetate Dihydrogedunin
or to
materials or
in
oxidizing
complete
sample
87.1
recovery.
86.8 85.6 Samples a r e held i n a 2 5 m l , t h i c k walled T e f l o n * c u p w h i c h is n o t attacked b y t h e acid charge. This c u p is c o n f i n e d w i t h i n a sturdy stainless steel b o m b f r o m w h i c h i t is easily removed f o r sample recovery a n d w a s h i n g . No wrenches o r clamps are needed t o p r o d u c e a t i g h t seal. Ask for PARR Bulletin 4745 describing this rapid method for dissolving difficult samples.
^Λ_ "^'
2,6-Di-r-butyl-4-methylp h e n o l (ionol)
COMPANY
211 F i f t y - T h i r d St.
M o l i n e , I I I . 61265 (309)
85.5
Water baths At these prices why buy an ordinary bath? Why indeed! Techne baths offer a remarkable performance for an extraordinary low cost. High quality stainless steel tanks using solid drawn construction. Available in five standard sizes. Using thermistor temperature sensor and all solid state switching. Control ± 0 . 0 5 ° C. Range 0 to 1 0 0 ° C or 2 0 0 ° C. These are stirred baths, available w i t h optional pump for circulation to external apparatus. A shaking water bath and a complete range of accessories are also available. Prices start as l o w as $215.00. For free 16 page constant temperature bath catalog write t o Techne Incorporated. 6 6 1 Brunswick Pike. Princeton. N e w Jersey 0 8 5 4 0 or call (609) 4 5 2 - 9 2 7 5 .
Techne . . . leaders constant baths.
in temperature
A V A I L A B L E T H R O U G H M A J O R LABORATORY SUPPLY HOUSES.
CIRCLE 2 2 3 O N READER SERVICE CARD 744 A
ANALYTICAL
C H E M I S T R Y , V O L . 4 6 , N O . 8, JULY 1974
2,6-Di- f -butyl-4m ethyl-phenol 2,6-Di-f-butyl-phenol 2,6-Di-f-butyl-4methyl-phenol p-f-Butylphenol
1-Pentadecene
100.0 99.5 99.1 98.8
1-Pentadecene 1-Heptadecene 1-Octadecene 1-Octadecene
o-Tolyl-p-tolylether
100.0 93.3 93.2 91.8
o-Tolyl-p-tolylether m-Tolyl-p-tolylether Phenyl-o-tolylether Di-p-tolylether
97.1 96.8 96.7 96.6
4-Octyne 4-Octyne 4-Nonyne 4-Methyl-2-hexyne
3-Nonyne
762-7716
CIRCLE 1 8 9 O N READER SERVICE CARD
93.5 89.5 88.3
*duPont TFE flurocarbon resin.
PARR INSTRUMENT
Reference compound 7-Nonalactone 7-Decalactone 7-Octalactone 7-Heptalactone
l,4-Dichlorobutene-2
dissolve inorganic samples i n digest
Similarity, % 100.0 96.5 94.2 94.1
o-Chloropropylbenzene
100.0 99.5 94.3 93.6
Diamylamine
100.0 96.6 95.6 95.2
o-Chloropropylbenzene m- a n d p-Chloropropylbenzene p-Chloroethylbenzene o-Chloroethylbenzene Diamylamine Di-(2-ethylbutyl)amine Di-isohexylamine Di-(l-methylheptyl)-
Nevertheless, if much additional nonspectroscopic in formation about the sample is available, a human analyst is generally much more powerful than a machine. There fore, systems in which computer-aided interpretation of spectral data is used to identify the structure of organic compounds will find their main application in fields where samples have to be routinely analyzed without knowledge of their origin, e.g., in the fields of forensic chemistry, analysis of metabolites, and environmental pollution.
Bibliography J. T . Clerc, F. Erni, C. Jost, J. Meili, P . Naegeli, and R. Schwarzenbach, Z. Anal Chem., 264, 192 (1973). S.L. Grotch, Areai. Chem., 45,2(1973). S. R. Heller, ibid., 44,1951 (1972), H. S. Hertz, R. A. Hites, and K. Biemann, ibid., 43, 681 (1971). Kain-Sze Kwok, R. Venkataraghavan, and F. W. McLaff'erty, J. Amer. Chem. Soc, 95, 4185 (1973). B. A. Knock, I. C. Smith, D. E. Wright, R. G. Ridley, and W. Kelly, Anal. Chem., 42, 1516(1970). L. E. Wangen, W. S. Woodward, and T. L. Isenhour, ibid., 43, 1605(1971).
