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terms
organic chemistry terms
23
Chemistry
Undergraduate 3
11/10/2008

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Term
cis
Definition
same side of pi bond
Term
trans
Definition
opposite side of pi bond
Term
E
Definition
highest priority groups on opposite sides of pi bond
Term
Z
Definition
highest priority groups on same side of the pi bond
Term
enatiomer
Definition
two chiral isomers
Term
stereogenic center
Definition
chiral center
Term
dextrorotatory
Definition
chiral molecule that polarizes light clockwise
Term
lavorotatory
Definition
chiral molecule that polarizes light c-clockwise
Term
R
Definition
right-hand chiral center
Term
S
Definition
left hand chiral center
Term
diastereomers
Definition
sterioisomers that are not enantiomers
Term
Racemic
Definition
equal mix of S and R enantiomers
Term
enantiomeric excess
Definition
% of one type of enantiomer greater than another (ie - 10%/90% == 80% enatiomeric excess)
Term
meso isomers
Definition
molecules with 2 apparent steriogenic centers, but w/ a plane of symmetry
Term
conformational isomers
Definition
molecules that differ by rotation around a single bond
Term
eclipsed conformation
Definition
bond w/ 0degree conformation angle
Term
staggered conformation
Definition
bond w/ conformational angle of 60 degrees
Term
torsional strain
Definition
electric repulsion of electrons when bonds overlap
Term
steric strain
Definition
physical interation of overlapping groups on a conformal bond
Term
syn
Definition
conformation where two groups overlap (0 degrees)
Term
anti
Definition
staggered conformation with two groups 180 degrees from each other
Term
gauche
Definition
conforman w/two groups seperated by 60 degrees
Term
angle strain
Definition
bonds bent b/c of a cyclic compound
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