BLOCK ONE Flashcards
a single bond is made of a
sigma bond
a double bond is made of
one sigma bond and one pi bond
a triple bond is made of
one sigma bond and two pi bonds
what does not appear in the DBE formula
oxygen
what are constitutional isomers
have the same molecular formula, different atom to atom bonding sequence
what are conformational isomers
have the same molecular formula, same atom to atom bonding sequence but the arrangement in space differs and it can interconvert by rotation about a single bond
what happens to groups in ring flip
all axial groups»_space;> equatorial
all equatorial groups»_space;> axial
but up stays up and down stays down
the favoured conformer has the largest atom/group in the
equatorial position
what are configurational isomers
same molecular formula, same atom to atom bonding sequence but the arrangement in space differs and they can only be converted by breaking and reforming a covalent bond
what are the two classes of configurational isomers
enantiomers and diastereomers
what are enantiomers
chiral and non-superimposable mirror images
what are diastereomers
chiral, non-superimposable and not mirror images (e/z, cis/trans etc)
state increasing priority of main elements
H < C < N < O < F < Cl < Br < I
if two higher priority on the same side of the double bond, what configuration?
Z
if two higher priority on opposite sides of the double bond, what configuration?
E
