Illustrated Glossary of Organic Chemistry
Enthalpy
of
hydrogenation
(heat of
hydrogenation
):
The
enthalpy change (Δ
H
)
that occurs during
catalytic hydrogenation
. Used to compare stability of
pi-bonded
molecules
, and as a probe of
alkene
stability,
alkyne
stability,
conjugation
, and
aromaticity
.
The
enthalpy
of
hydrogenation
of
1,3-butadiene
is less than the
enthalpy
of
hydrogenation
of 2-
butyne
. Therefore the
pi bonds
of
1,3-butadiene
are more stable than the
pi bonds
of 2-
butyne
.
Related terms:
Enthalpy of formation
,
heat of formation
,
Δ
H
f
0
,
enthalpy of combustion
,
heat of combustion
,
resonance energy
,
addition reaction
,
kcal
,
mol
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