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Appendices 1-18 to: Report on the Health Effects of Selected Pesticide Coformulants

Appendix 18: 1-Hydroxy-4-methyl-2-pentanone (HMP) 
136     General description

136.1     Identity   

Molecular formula:          C₆H₁₂O₂

Structural formula:

Molecular weight:            116

CAS-no.:                               123-42-2

Synonyms:                      Diacetone alcohol

                                      4-Hydroxy-2-keto-4-methylpentane

                                      2-Methyl-2-pentanol-4-one

                                      Acetonyldimethylcarbinol

                                      Diketone alcohol

                                      2-Hydroxy-2-methyl-4-pentanone

                                      4-Hydroxy-4-methylpentan-2-one

                                      4-Hydroxymethyl isobutyl ketone

136.2     Physico / chemical properties

Description:                    4-Hydroxy-4-methyl-2-pentanone (HMP) is a colourless liquid with a sweetish odour.

Melting point:                         - 44 °C

Boiling point:                   169 °C

Density:                          0.93 g/ml at 25°C

Vapour pressure:             0.97 mmHg (129 Pa) at 20°C

Concentration of

saturated vapours:           6165 mg/m³ (1276.3 ppm) (calculated)

                                      1550 ppm at 20°C and 760 mmHg (Patty)

Conversion factor:           1 ppm = 4.83 mg/m³ at 20°C and 760 mmHg

                                      1 mg/m³ = 0.21 ppm

Solubility:                        Completely miscible in water at 20°C. Also readily soluble in e.g., alcohol and ether.

Partition coefficient:        Log P_o/w =  -0.098 (estimated)

References:                    A&H (1989), DPIMR (1996), HSDB (2001).

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