3. Given the following names of organic compounds, draw a suitable structure using wedges and hashed lines only where necessary: (Remember, 6 atoms lie in the plane of each double bond!) (a) 3,3-dimethyl-1-pentene (b) R-1,4-dimethylcyclohexene (c) 2-trans-4-cis-2,4-heptadiene (d) cis-2,3-diethyloxirane
Reactive Intermediates
In chemistry, reactive intermediates are termed as short-lived, highly reactive atoms with high energy. They rapidly transform into stable particles during a chemical reaction. In specific cases, by means of matrix isolation and at low-temperature reactive intermediates can be isolated.
Hydride Shift
A hydride shift is a rearrangement of a hydrogen atom in a carbocation that occurs to make the molecule more stable. In organic chemistry, rearrangement of the carbocation is very easily seen. This rearrangement can be because of the movement of a carbocation to attain stability in the compound. Such structural reorganization movement is called a shift within molecules. After the shifting of carbocation over the different carbon then they form structural isomers of the previous existing molecule.
Vinylic Carbocation
A carbocation where the positive charge is on the alkene carbon is known as the vinyl carbocation or vinyl cation. The empirical formula for vinyl cation is C2H3+. In the vinyl carbocation, the positive charge is on the carbon atom with the double bond therefore it is sp hybridized. It is known to be a part of various reactions, for example, electrophilic addition of alkynes and solvolysis as well. It plays the role of a reactive intermediate in these reactions.
Cycloheptatrienyl Cation
It is an aromatic carbocation having a general formula, [C7 H7]+. It is also known as the aromatic tropylium ion. Its name is derived from the molecule tropine, which is a seven membered carbon atom ring. Cycloheptatriene or tropylidene was first synthesized from tropine.
Stability of Vinyl Carbocation
Carbocations are positively charged carbon atoms. It is also known as a carbonium ion.
![* Pill in the following blanks A cycloalkadiene with 8 cartons will have the molecular formula
CH An alkene cowtains wo dirferent bonds between Csp carbons called a
bond
and a
bond. The double bonds in vegetable oils and natural rubber all have the
configuration. Oily liquid fatty acid esters in peanut butter can be turned into solids by catalytic
over a metallic Pd (or Ni) catalyst. The anti-addition of bromine to cyclohexene
gives
-1,2-dibromocyclohexane. A 2° alkyl bromide is produced when
is
added to a trans-disubstituted alkene.
2. Answer the following questions using only the terms Less or More.
heat is evolved
during catalytic hydrogenation of disubstituted alkene than with a trisubstituted alkene. In addition
reactions of H-X to an alkene, the proton is attached to the
-substituted carbon. The
addition of borane (BH3) to a 1-alkene gives an alkylborane with the boron bonded to the
substituted carbon. A 3° carbocation is
stable than a 2° carbocation.
3. Given the following names of organic compounds, draw a suitable structure using wedges and
hashed lines only where necessary: (Remember, 6 atoms lie in the plane of each double bond!)
(a) 3,3-dimethyl-1-pentene
emes if approprate
(b) R-1,4-dimethylcyclohexene
(c) 2-trans-4-cis-2,4-heptadiene
the following
(d) cis-2,3-diethyloxirane
4. Name the following compounds:
(a)
(6)
(c)
+H-
(d)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F7f01331f-9204-46ba-8f7f-7cff9b618bbc%2F5b8f8168-305b-48e4-844b-3017c61fab1a%2Fo70oz5g_processed.jpeg&w=3840&q=75)
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