1,3-Dimethyluracil

Synonym(s):1,3-Dimethyl-2,4(1H,3H)-pyrimidinedione;2,4-Dihydroxy-1,3-dimethylpyrimidine

CAS NO.：874-14-6
Empirical Formula: C6H8N2O2
Molecular Weight: 140.14
MDL number: MFCD00038065
EINECS: 212-856-4
SAFETY DATA SHEET (SDS)
Update Date: 2026-04-24 14:59:12

What is 1,3-Dimethyluracil?

Chemical properties

white to light yellow needles

The Uses of 1,3-Dimethyluracil

1,3-Dimethyluracil is suitable reagent used to investigate the steady-state absorption and fluorescence spectra of uracil derivatives. It may be used in the preparation of 2,6-dihydroxynicotinamide.

Definition

ChEBI: 1,3-dimethyluracil is a pyrimidone that is uracil with methyl group substituents at positions 1 and 3. It has a role as a metabolite. It is functionally related to a uracil.

General Description

1,3-Dimethyluracil is a pyrimidine derivative. Stability of the C6-centered carbanions derived from 1,3-dimethyluracil has been investigated in the gas phase and in DMSO and water solutions. The excited state structural dynamics of 1,3-dimethyluracil (DMU) in water and acetonitrile has been studied by resonance Raman spectroscopy. Crystal structure of 1,3-dimethyluracil has been reported. Ultraviolet irradiation of aqueous 1,3-dimethyluracil results in hydration of the 5:6 double bond of the uracil ring to form 1,3-dimethyl-6-oxy-hydrouracil.

Purification Methods

Crystallise it from EtOH/ether. [Beilstein 24 III/IV 1196.]

Properties of 1,3-Dimethyluracil

Melting point:	119-122 °C (lit.)
Boiling point:	256.63°C (rough estimate)
Density	1.2850 (rough estimate)
refractive index	1.5010 (estimate)
storage temp.	Sealed in dry,Room Temperature
pka	-2.04±0.20(Predicted)
form	powder to crystal
color	White to Almost white
Water Solubility	almost transparency
BRN	124074
CAS DataBase Reference	874-14-6(CAS DataBase Reference)
NIST Chemistry Reference	2,4(1H,3H)-Pyrimidinedione, 1,3-dimethyl-(874-14-6)
EPA Substance Registry System	2,4(1H,3H)-Pyrimidinedione, 1,3-dimethyl- (874-14-6)

Safety information for 1,3-Dimethyluracil

Signal word	Warning
Pictogram(s)	Exclamation Mark Irritant GHS07
GHS Hazard Statements	H319:Serious eye damage/eye irritation
Precautionary Statement Codes	P261:Avoid breathing dust/fume/gas/mist/vapours/spray. P271:Use only outdoors or in a well-ventilated area. P280:Wear protective gloves/protective clothing/eye protection/face protection. P312:Call a POISON CENTER or doctor/physician if you feel unwell. P302+P352:IF ON SKIN: wash with plenty of soap and water. P304+P340:IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. P403+P233:Store in a well-ventilated place. Keep container tightly closed.