Allylic Carbon: Meaning, Example, Hydrocarbon, Allylic Carbocation

Vinyl carbons and allylic carbons are two types of double-bonded carbon atoms. The general formula for a vinyl group is R-CH=CH2, where both carbon atoms are joined by double bonds and R is attached to the vinyl position. The modern periodic table in which all currently known elements are arranged in ascending order of atomic number. 18 vertical columns are there and they are called groups and 7 horizontal rows are known as periods.

Two rows of 14 elements, referred to as the f-block elements, make up the bottom of the periodic table. The current periodic table has a predominantly metal-filled left side and a non-metallic right side. Some substances have characteristics that fall between those of metals and nonmetals. These substances, known as metalloids, are located between metals and nonmetals in a zigzag pattern.

Meaning Of Allylic Carbon

• Vinyl and allyl carbon atoms can be found among the double-bonded carbon atoms. R-CH=CH2 is the standard formula for a vinyl group, where both carbon atoms are joined by double bonds and R is attached to the vinyl position.

• Both sp2 hybridised carbon atoms form a covalent double bond. The allylic position is also similar to the vinylic position. A double bond between two carbon atoms holds an allylic carbon to one of them.

• The allylic carbon atom is represented by the asterisk in the generic formula for allyl, which is R-CH2-CH=CH2. The allylic carbon atom is joined to CH=CH2 by a single covalent connection, as opposed to the vinyl group, which results in the formation of an sp3 hybrid.

• It gives the allyl group its unique chemical properties, and the presence of this group in various compounds results in the formation of allyl compounds, which are used in the production of various natural products such as natural rubber, terpenes, etc.

Allylic Carbon Atoms

The sp3 hybridised carbon atom of the allyl group RCH2-CH=CH2 linked to the -CH=CH2 group is known as the allyl carbon atom.

For instance, the allylic carbon atom (CH3-CH=CH2) is indicated in propene. Similar to this, the allylic carbon atoms are next to the double bond in cyclohexene.

Hydrocarbon

Organic compounds are composed of various elements with parent carbon chains. Hydrocarbons are the most common organic compounds. Carbon and hydrogen atoms are present in hydrocarbons.

• Carbon exhibits tetravalence and can form four covalent bonds with the same or different elements.

• Being tetravalent, carbon can exhibit chains and form various organic compounds.

• Chaining is the property of a carbon or other element to form a covalent bond with the same element.

• It is possible to categorise carbon atoms as primary, secondary, or tertiary depending on how many carbon atoms are linked to each one.

• A primary carbon atom is a carbon atom that is bound to another carbon atom.

For instance, both carbon atoms are significant carbon atoms in the ethane molecule (CH3-CH3) since they are both connected to another carbon atom. A tertiary carbon atom forms a bond with three other carbon atoms, while a secondary carbon atom forms a bond with two additional carbon atoms.

Allylic Carbocation

Allyl groups form allylic carbocations when the allylic carbon atom has a positive charge.