YELLOW FINE CRYSTALLINE POWDER
CQ-amines are used as a photo initiators for free radical polymerization. CQ was used as an initiator in the preparation of silver nanoparticle/silica/ polymer nanocomposites. Photopolymerization kinetics of dimethacrylates were studied using the CQ/amine initiator system.
Camphorquinone derivative (i.e. carboxylated camphorquinone) is used as visible-light photoinitiator in biomedical applications. It is also used in dentistry and is often used in conjunction with hydrogen donating amine.
initiator for visible-light-cured dental acrylic-composite materials.
ChEBI: Bornane-2,3-dione is a bornane monoterpenoid that is bicyclo[2.2.1]heptane substituted by methyl groups at positions 1, 7 and 7 and oxo groups at positions 2 and 3. It is a bornane monoterpenoid and a carbobicyclic compound.
Camphorquinone (CQ) absorbs UV radiation in the region of 200-300nm due to the ΠΠ* transition and visible light (400-500nm) due to the n, Π* transition of the α-dicarbonyl chromophore.
In 1934, Evans et al. found that the direct oxidation of camphor with selenium dioxide in acetic acid can obtain camphor quinone. Typical conditions of the reaction is at 140-150 , heating 3-4h, to be the end of the reaction with acetic acid extraction, the extract is neutralized with concentrated alkali, the camphor quinone is insoluble in water and precipitated. Then it can be purified by sublimation method or recrystallization method. This method has simple steps and high yield, up to about 90%, so it is still widely used. However, the selenium dioxide used in the method is a highly toxic compound, and there is selenium residue in the product, which will limit the application of camphor quinone in medicine.
Purification is the same as for above enantiomers. [Huckel & Fichtig Justus Liebigs Ann Chem 628 81 1962, Evans et al. J Chem Soc 137 1939, Beilstein 7 I 325.]
