What Is Vinylic Atom

The general formula for allyl is r ch 2 ch ch 2 in which the asterisk carbon atom is an allylic carbon atom.

What is vinylic atom.

Allylic carbon atom can form stable carbocations due to electron delocalization. In chemistry vinyl or ethenyl abbreviated as vi is the functional group with the formula c h ch 2 it is the ethylene iupac ethene molecule h 2 c ch 2 with one fewer hydrogen atom. The libretexts libraries are powered by mindtouch and are supported by the department of education open textbook pilot project the uc davis office of the provost the uc davis library the california state university affordable learning solutions program and merlot. Carbanion any member of a class of organic compounds in which a negative electrical charge is located predominantly on a carbon atom carbanions are formally derived from neutral organic molecules by removal of positively charged atoms or groups of atoms and they are important chiefly as chemical intermediates that is as substances used in the preparation of other substances.

An allylic hydrogen is a hydrogen atom that is bonded to an allylic carbon in an organic molecule. Notice that the proton closest to the carbonyl group is at a higher chemical shift than the proton in cyclohexene 6 05 ppm for cyclohexenone vs. Key difference allylic vs vinylic carbons functional groups are very important in understanding the different physical and chemical properties of organic molecules the terms allylic and vinyl carbons indicate whether the carbon atom is bonded directly or indirectly to a double bond in a molecule. Any carbon atom which is attached to a carbon which is linked with another carbon atom via double bond is called vinylic carbon.

The allylic carbon is bonded to a carbon atom which is doubly bonded to another carbon atom. In the given compound carbon at number 3 is known as vinylic carbon because it is bonded to double bonded carbon atom. This is not surprising since the proton is not only vinylic but it is also alpha to a carbonyl group. Vinylic compounds can produce vinylic polymers such as pvc pvf pvac etc.

The allylic position is also like a vinylic position. Now consider 2 cyclohexenone below. We also acknowledge previous national science foundation support under grant numbers 1246120 1525057 and 1413739. An industrially important example is vinyl chloride precursor to pvc a plastic.

The key difference between allylic and vinylic carbon is that allylic carbon is the carbon. On a carbon skeleton sp 2 hybridized carbons or positions are often called vinylic. The name is also used for any compound containing that group namely r ch ch 2 where r is any other group of atoms. We also acknowledge previous national science foundation support under grant numbers 1246120 1525057 and 1413739.