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Since the late 1950's when proton n. m. r. spectroscopy was first
used in organic natural products studies the technique has
increasingly con of this important area of chemistry. tributed to
the rapid advancement Although the potential utility of 13C n. m.
r. was recognized very early, essentially no application of 13C n.
m. r. appeared in the literature prior to 1966 and 95% of the
existing data are less than five years old. The initially slow
growth had its cause in inadequate instrumentation, insufficient
sensitivity being the main obstacle. This situation drastically
changed with the advent and commercial availability of broadband ex
citation and Fourier transform methods, giving natural-abundance
13C n. m. r. and its numerous chemical applications a tremendous
impetus. Today BC spectra can be recorded on sample quantities down
to the submilligram level, which until recently even withstood
proton n. m. r. Paralleling the development of experimental
techniques considerable progress has also been made on an
understanding of spectral parameters, in particular their
stereochemical implications on natural products. Although the large
majority of data present up to now deals with known structures, an
adequate basis now exists which allows the chemist to use the
technique for tackling real problems on unknown molecules."
Since the late 1950's when proton n. m. r. spectroscopy was first
used in organic natural products studies the technique has
increasingly con of this important area of chemistry. tributed to
the rapid advancement Although the potential utility of 13C n. m.
r. was recognized very early, essentially no application of 13C n.
m. r. appeared in the literature prior to 1966 and 95% of the
existing data are less than five years old. The initially slow
growth had its cause in inadequate instrumentation, insufficient
sensitivity being the main obstacle. This situation drastically
changed with the advent and commercial availability of broadband ex
citation and Fourier transform methods, giving natural-abundance
13C n. m. r. and its numerous chemical applications a tremendous
impetus. Today BC spectra can be recorded on sample quantities down
to the submilligram level, which until recently even withstood
proton n. m. r. Paralleling the development of experimental
techniques considerable progress has also been made on an
understanding of spectral parameters, in particular their
stereochemical implications on natural products. Although the large
majority of data present up to now deals with known structures, an
adequate basis now exists which allows the chemist to use the
technique for tackling real problems on unknown molecules."
Scent and Chemistry Odor impressions have cast a spell over mankind
since the dim and distant past. But even today, we are -consciously
or subconsciously- guided by our sense of smell and the chemistry
behind it. The prominent fragrance chemists Gunther Ohloff, Wilhelm
Pickenhagen and Philip Kraft convey the scientist, the perfumer,
and the interested layman with a vivid and up-to-date picture of
the chemistry of odorants and the research in odor perception. In
this second thoroughly revised and updated edition they are joined
by creative perfumer Fanny Grau, a rising master in this metier,
who complements the scientific treatise by a concise introduction
to the art of perfumery and its composition techniques. Besides
this new chapter on the creative aspects of perfumery, the book
details on the molecular basis of olfaction, olfactory
characterization of perfumery materials, structure-odor
relationships, the chemical synthesis of odorants, and the
chemistry of essential oils and odorants from the animal kingdom,
backed up by many perfume examples and historical aspects. It will
serve as a thorough introductory text for everyone interested in
the molecular world of odors.
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