By Leonard, John; Lygo, B.; Procter, Garry
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Additional resources for Advanced practical organic chemistry
Sometimes, it will be quite easy to establish the structure of a compound beyond reasonable doubt, from, say, a simple 1H NMR spectrum alone, especially if you know how the substance was synthesized. In other cases, structure determination may be a major project in itself. In particular, it is often a challenge to establish the absolute and/or relative stereochemical arrangement in chiral compounds. This may, for example, involve several sets of two-dimensional NMR correlation experiments to determine coupling constants and nuclear Overhauser effect (nOe) experiments to determine through-space interactions.
Combustion analysis is the other main technique for molecular formula determination and has the advantage that it also provides an indication of sample purity. 5%. 5%. 1H NMR spectrum 4. For organic compounds, 1H NMR data is usually the most important piece of characterization data. You should try to analyze the Chapter three: Keeping records of laboratory work 25 spectrum as fully as possible, and the values for every individual proton chemical shift and every coupling constant should be identified if at all possible.
Literature references It is good practice to write any key literature references in your laboratory book. These would typically be references to original reports of the procedure being followed or to publications containing characterization data for the compounds being prepared. Including this information in your laboratory book makes it very easy to find when writing reports and theses. 6. Materials table of reagents and quantities A materials table should be included at the start of the write-up containing the quantities of each ingredient of the reaction, together with the molecular weight, number of moles, and number of molar equivalents.