Alkynes, similar to alkenes, undergo addition reactions due to their unsaturated nature. However, their triple bonds allow for two successive addition steps, leading to more highly substituted products compared to alkenes.
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the additional reactions
involving alkynes
alkynes are also unsaturated hydrocarbons
hydrocarbons
just like alkenes therefore the addition
reactions with
alkynes work in a very similar manner to alkenes
alkenes
as you can see down the bottom the same four
four
types of addition reactions are possible
with alkynes
so it is recommended that you watch your
videos on the reactions
of alkenes before this video alkynes are
more reactive
and better nucleophiles and alkenes
simply due to the presence of
three covalent bonds rather than two
the additional reactions work in a very
similar mechanism as alkenes
but due to the presence of triple bonds
there are two rounds of additional reactions
reactions
when alkynes undergo hydrohalogenation
the reaction between propine and
hydrogen bromide
first produces an alkene where
the third bond between the two carbon
atoms is broken
allowing the bromine atom and the
hydrogen atom to be added
to the two carbon atoms across the
double bond in the alkene
however because alkenes are still unsaturated
unsaturated
further reaction with another molecule
of hydrogen bromide
allows the formation of an alkane molecule
molecule
but this time two additional
atoms that is one more hydrogen and one
more bromine atom
are further added to the two carbon
atoms this produces an alkane molecule
that is inhaler alkane with two atoms of halogen
halogen
added to the same carbon atom in the
major product similar to alkenes
hydrohalogenation of alkynes is also
concerned with macrophobia the major product
product
of this reaction is always the one where
the two halogen atoms
are connected to the same carbon atom in
the final alkane molecule
halogenation of alkynes produces
a hella alkane with four halogen atoms
added across the triple bond again this reaction
reaction
occurs in a mechanism that consists of
two rounds of additional reactions
first of all the alkyne reacts with
bromine gas
to produce an alkene with two bromine
atoms already added
the subsequent reaction between the
alkene molecule and the bromine gas
produces an alkane molecule with two
additional bromine atoms added to it
this finally produces hello alkane with
a total of
four hydrogen atoms added to the two
carbon atoms
across where the triple bond used to be
hydrogenation of alkynes in the presence
of palladium carbon catalyst
converts an alkyl molecule into an
alkene molecule
which then is further converted into an
alkane molecule
in other words if you want to convert or transform
transform
an alkyl molecule to its alkyn counterpart
counterpart
you will also use hydrogen gas
in the presence of palladium carbon
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