Organic Chemistry

Download e-book for iPad: Designing Organic Syntheses: A Programmed Introduction to by WARREN STUART

By WARREN STUART

ISBN-10: 0471996122

ISBN-13: 9780471996125

Teaches scholars to take advantage of the language of sythesis without delay (utilizing the grammar of synthon and disconnection) instead of translating it into that of natural chemistry.

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Download e-book for iPad: Designing Organic Syntheses: A Programmed Introduction to by WARREN STUART

Teaches scholars to exploit the language of sythesis at once (utilizing the grammar of synthon and disconnection) instead of translating it into that of natural chemistry.

Extra info for Designing Organic Syntheses: A Programmed Introduction to the Synthon Approach

Sample text

A) (b) FT --. 3 --. frequency --. 3. Such spectra are quite uninterpretable by inspection, but Fourier transformation converts them into' ordinary frequency-domain spectra. The time-scale of the FID experiment is of the order of seconds during which the magnetisation may be sampled many thousands of time. Data sampling is accomplished by a dedicated computer that is also used to perform the Fourier transformation. The principal advantage ofFT NMR spectroscopy is a great increase in sensitivity per unit time of the experiment.

The mass of an ion is routinely determined to the nearest unit value. Thus the mass of [M]+ gives a direct measure of molecular weight. It is not usually possible to assign a molecular formula to a compound on the basis of the integer m/e value of its parent ion. 00001 of a mass unit (a high resolution mass spectrum). Since the masses of the atoms of each element are known to high accuracy, molecules that may have the same mass when measured only to the nearest integer mass unit, can be distinguished when the mass is measured with high precision.

The pattern and intensity of fragments in the mass spectrum is characteristic of an individual compound so comparison of the experimental mass spectrum of a compound with those in a library can be used to positively identify it, if its spectrum has been recorded previously. g. using gas chromatography (GC) or high performance liquid chromatography (HPLC), directly to the input of a mass spectrometer. In this way, as each individual compound is separated from the mixture, its mass spectrum can be recorded and compared automatically with the library of known compounds and identified immediately if it is a known compound.

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Designing Organic Syntheses: A Programmed Introduction to the Synthon Approach by WARREN STUART


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