L31 462a_carb1_lec31_2012

Reacdonisfreelyreversible 2common rings

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Unformatted text preview: dose
 Fischer
projecDon
 aldehyde
 Ketose
 Fischer
projecDon
 ketone
 •  The
most
common
ketoses
 are
with
ketone
group
at
C2
 •  Number
of
stereoisomers
=
 2n,
where
n
=
#
of
chiral
 carbons
 •  D
vs.
L
is
determined
by
the
 chiral
C
furthest
from
the
 carbonyl
C
 •  Naturally
occurring
 monosaccharides
are
 D‐isomers
 –
oaen
D
is
omieed
 Stereochemistry
 •  SpaDal
arrangement
of
atoms
 •  Stereoisomers
have:
 –  The
same
order
and
types
of
bonds
 –  Different
spaDal
arrangements
of
atoms
 –  Different
properDes
 •  Defined
based
on
chiral carbon
atoms
 –  Chiral
carbons
have
4
different
subsDtuents
 •  Number
of
stereoisomers
=
2n,
where
n=
#
of
chiral
carbons
 •  Many
biologically
important
chemicals,
like
carbohydrates,
 exist...
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This note was uploaded on 01/22/2014 for the course BIOC 462A taught by Professor Ziegler,baldwin during the Winter '08 term at Arizona.

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