Vinyl group

It is the ethylene (IUPAC name: ethene) molecule (H2C=CH2) with one fewer hydrogen atom.

Then in 1839 it was renamed by Justus von Liebig to "acetyl", because he believed it to be the radical of the acetic acid.

[4] The modern term was coined by German chemist Hermann Kolbe in 1851, who rebutted Liebig's hypothesis.

[5] However even in 1860 Marcellin Berthelot still based the name he coined for acetylene on Liebig's nomenclature and not on Kolbe's.

The etymology of "vinyl" is the Latin vinum = "wine", and the Greek word "hylos" 'υλος (matter or material), because of its relationship with ethyl alcohol.