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where the six carbon atoms are arranged in a cyclic ring structure. It is in the Aryl group. It is highly stable, and is also a member of the aromatic family of compounds. This hydrophobic and aromatic hydrocarbon unit can be found in many organic compounds. It can be thought of as being derived from benzene (C6H6). In fact, in chemical literature benzene itself is sometimes denoted as Ph. One of the simplest phenyl containing compounds is phenol, C6H5OH. The resonance stability of phenol makes it a stronger acid than that of another alcohol (pKa = 10 vs. 16-18).
Presence of a phenyl group typically results in an 1H-NMR shift around 7.7ppm.