Die mikroanalytische Bestimmung der Carbonylgruppe

Schöniger, Wolfgang; Lieb, Hans

doi:10.1007/bf00459693

Cited by 7 publications

(4 citation statements)

References 12 publications

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“…The difficulties in these methods lie in the quantitative separation of the hydrazone and drawbacks in the use of titanous chloride. Schoeniger and Lieb (27,28) determined the excess 2,4-dinitrophenvihydrazine with titanous chloride. p-Nitrophenylhydrazine has been used (24) by isolating the derivative, reducing with stannous ion, and determining the excess stannous iodometrically.…”

Section: Results Of Lead Ore Analysismentioning

confidence: 99%

Determination of Aldehydes Using Unsymmetrical Dimethylhydrezine

Siggia¹,

Stahl²

1955

Anal. Chem.

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Section: Results Of Lead Ore Analysismentioning

confidence: 99%

Determination of Aldehydes Using Unsymmetrical Dimethylhydrezine

Siggia¹,

Stahl²

1955

Anal. Chem.

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“…In other methods, an excess of a standard solution of lithium aluminum hydride is back-titrated with a standard solution of alcohol (4). The microcombustion method requires only a few milligrams of the sample, but the technique is laborious and time consuming (9). A more recent method involves exchange of the active hydrogen with deuterium followed by an assay of the isotopic hydrogen content of the sample (8).…”

Section: Determination Of Active Hydrogenmentioning

confidence: 99%

Gas Chromatographic Technique for Determination of Hydridic and Active Hydrogen in Organic Materials. Microanalysis of Borane Compounds and Alcohols

Lysyj¹,

Greenough²

1963

Anal. Chem.

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“…These procedures appear to be representative of those comprising a practical course in identification of organic compounds for graduate students in the Technical University, Copenhagen, Denmark. Indication of a trend in quantitative functional group determinations is seen in the microanalytical use of lithium hydride by Schoniger (74).…”

Section: Physical Propertiesmentioning

confidence: 99%

Characterization of Organic Compounds

Peck¹

1952

Anal. Chem.

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HE accepted requirements for full characterization of an T organic compound include establishment of purity of sample, determination, of physical properties, determination of elementary composition, functional groups, and empirical formula, and elucidation of structural formula and spatial relationships. It is evident that identification of a known molecule will involve less extensive investigation than full characterization of a complex new compound. The characterization of simple or complex compounds may be accomplished by any of a Tide variety of techniques and methods, some of which are more effective than others. The choice of criteria and procedural steps is often dependent on availability of special equipment. Infrared absorption spectra and x-ray diffraction patterns alone, for example, are sufficient to identify many known substances; identification carried out by chemical methods, while sometimes more timeconsuming, is equally effective.A consequence of the recent increase in number and scope of chemical studies of naturally occurring organic substances is seen in the widely held view that thorough training in principles of characterization is of fundamental importance for students majoring in organic chemistry. A comprehensive treatise on detailed methods and techniques of characterization may some day be available. I t is probably true, however, that after successfully completing the characterization of a complex, new organic molecule the chemist enjoys a thrill of satisfaction derived in large part from the realization that the sequence of steps used was not given to him in a single reference work but was the result of his own experience, insight, and skill (and perhaps some luck).The present review of recent contributions in this realm of characterization is concerned with methods for determining purity of samples, procedures for establishing physical properties, and chemical methods of characterization. PURITYIt is essential for clear-cut determination of properties and for interpretable degradative work that the samples employed be substantially pure. Procedures which are now found most useful for establishment of degree of purity of samples were reviewed recently (64, 65). No fundamentally new methods of these types have been introduced during the past year, but there have appeared a number of papers in which extensions or new applications of method are described.The development by Craig (16, 64) of a machine for carrying out many-plate countercurrent distributions, and the recent introduction of a convenient glass apparatus for larger numbers of separation stages (19, 65) are now widely recognized. These methods have been introduced in many laboratories and have proved their worth. Continued studies by Craig and his coworkers have culminated in the development of an automatic control device for use with the glass apparatus (17). A strictly discontinuous extraction train containing 220 glass equilibration cells may now be operated automatically, so that 800 equilibration stages (about 150,000 ext...

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Die mikroanalytische Bestimmung der Carbonylgruppe

Cited by 7 publications

References 12 publications

Determination of Aldehydes Using Unsymmetrical Dimethylhydrezine

Determination of Aldehydes Using Unsymmetrical Dimethylhydrezine

Gas Chromatographic Technique for Determination of Hydridic and Active Hydrogen in Organic Materials. Microanalysis of Borane Compounds and Alcohols

Characterization of Organic Compounds

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