TMHPO
GENERAL
TMHPO is an orange red crystal. It is an important intermediate for the synthesis of HALS and also can
be used as a pharmaceutical intermediate. It can prevent alkenes from self-polymerisation or control and
adjust the degree of polymerisation.
CHEMICAL NAME : 4-Hydroxy-2,2,6,6-tetramethylpiperidinyloxy
SYNONYMS : 4-Hydroxy-TEMPO or 4-OH-TEMPO
CHEMICAL FORMULA : C9H18NO2
MOLECULAR WEIGHT : 172.25
CAS NUMBER : 2226-96-2
APPEARANCE : Orange red crystal
SPECIFICATIONS
PROPERTIES TYPICAL VALUE
Assay, % (Gas Chromatography) ≥99.0%
Appearance Orange red crystal
Melting Point 69-72 C
Weight loss ≥ 0.5%
Ash ≤ 0.1%
Appearance, 10% solution Clear
in Deionized water
Tetramethylpiperidinol ≤ 1.0%
(TMHPP) content,
(Gas Chromatography)