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This volume of the series Handbook of Zoology deals with the
anatomy of the gastrointestinal digestive tract - stomach, small
intestine, caecum and colon - in all eutherian orders and
suborders. It presents compilations of anatomical studies, as well
as an extensive list of references, which makes widely dispersed
literature accessible. Introductory sections to orders and
suborders give notice to biology, taxonomy, biogeography and food
of the respective taxon. It is a characteristic of this book that
different sections of the post-oesophageal tract are discussed
separately from each other. Informations on form and function of
organs of digestion in eutherians are discussed under
comparative-anatomical aspects. The variability and diversity of
anatomical structures represents the basis of functional
differentiations.
Dianions and masked dianions represent important building blocks
for the regioselective formation of carbon-carbon bonds.
Cyclocondensation reactions of 1,3-bis(silyl enol ethers) with
different mono(silyl enol ethers) provide an elegant approach for
the synthesis of various complex carba- and heterocycles from
simple starting materials. A variety of functionalized and
sterically encumbered triarylmethanes were prepared by combination
of FeCl3-catalyzed benzylations of 1,3-diketones and formal 3]3]
cyclocondensation reactions of 1,3-bis(silyl enol ethers) and
3-benzyl-1-silyloxy-1-en-3-ones. Subsequently, 4-methoxy-, 4-chloro
and 4-flulro-substituted triarylmethanes are prepared The products
are not readily available by other methods. In addition,
functionalized diarylmethanes have been also prepared by
cyclocondensation of 1.3-bis(silyl enol ethers) with with
respective 3-benzyl-1-silyloxy-1-en-3-ones. Further more, dianions
were converted to useful cyclic structure of pyranones with
functionalized benzaldehydes providing a new strategy. Varius
pyranones were synthecized containing 3-bromo-, 4-Methyl-,
4Phenyl-, 4-methoxy- and 4-hydoxy-phenyle groups.
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