Cresol

Isomers of Cresol[1][2][3][4]
Skeletal formula
Ball-and-stick model
General
Common name o-cresol m-cresol p-cresol
Preferred IUPAC name 2-methylphenol 3-methylphenol 4-methylphenol
Systematic name 2-methylbenzenol 3-methylbenzenol 4-methylbenzenol
Other names ortho-cresol
2-hydroxytoluene
meta-cresol
3-hydroxytoluene
para-cresol
4-hydroxytoluene
Molecular formula C7H8O
SMILES oc1c(C)cccc1 oc1cc(C)ccc1 oc1ccc(C)cc1
Molar mass 108.14 g/mol
Appearance at room
temperature and pressure
colorless crystals thicker liquid greasy-looking solid
CAS number [95-48-7] [108-39-4] [106-44-5]
mixture of cresols (tricresol): [1319-77-3]
Properties
Density and phase 1.05 g/cm3, solid 1.03 g/cm3, liquid 1.02 g/cm3, liquid
Solubility in pure water
at 20−25 °C
2.5 g/100 ml 2.4 g/100 ml 1.9 g/100 ml
soluble in strongly alkaline water
Melting point 29.8 °C (303.0 K) 11.8 °C (285.0 K) 35.5 °C (309.7 K)
Boiling point 191.0 °C (464.2 K) 202.0 °C (475.2 K) 201.9 °C (475.1 K)
Acidity (pKa) 10.287 10.09 10.26
Viscosity solid at 25 °C ? cP at 25 °C solid at 25 °C
Structure
Dipole moment 1.35 D 1.61 D 1.58 D
Hazards
SDS
Main hazards flammable, ingestion and inhalation toxicity hazard
Flash point 81 °C c.c. 86 °C 86 °C c.c.
GHS pictograms GHS05: CorrosiveGHS06: Toxic
RTECS number GO6300000 GO6125000 GO6475000
Related compounds
Related phenols xylenols
Related compounds bromocresol green, cresol red
Except where noted otherwise, data are given for
materials in their standard state (at 25 °C, 100 kPa)
Infobox disclaimer and references

Cresols (also known as hydroxytoluene, toluenol, benzol or cresylic acid) are a group of aromatic organic compounds. They are widely-occurring phenols (sometimes called phenolics) which may be either natural or manufactured. They are also categorized as methyl phenols. Cresols commonly occur as either solids or liquids because their melting points are generally close to room temperature. Like other types of phenols, they are slowly oxidized by exposure to air, and the resulting impurities often give the samples a yellow to brownish red tint. Cresols have an odor characteristic to that of other simple phenols, reminiscent to some of a "coal tar" smell. The name "cresol" is an adduct of phenol and their traditional source, creosote.

  1. ^ o-CRESOL (ICSC)
  2. ^ m-CRESOL (ICSC)
  3. ^ p-CRESOL (ICSC)
  4. ^ Pubchem. "o-cresol". pubchem.ncbi.nlm.nih.gov. Retrieved 2018-01-16.