97860-58-7Relevant academic research and scientific papers
First evidence of the formation of 5,8-endoperoxide from the oxidation of 1,4-disubstituted naphthalene by singlet oxygen
Pierlot, Christel,Aubry, Jean-Marie
, p. 2289 - 2290 (1997)
Bulky water-soluble 1,4-disubstituted naphthalenes react with singlet oxygen giving the usual 1,4- and the unexpected 5,8-endoperoxides and showing that the regioselectivity of the [4 + 2] cycloaddition of singlet oxygen depends on the steric hindrance of the substrate.
Quantification of Singlet Oxygen Generated by Thermolysis of 3,3'-(1,4-Naphthylidene)dipropionate. Monomol and Dimol Photoemission and the Effects of 1,4-Diazabicyclooctane
Di Mascio, Paolo,Sies, Helmut
, p. 2909 - 2914 (2007/10/02)
Singlet oxygen arising from the thermal decomposition of the water-soluble endoperoxide of 3,3'-(1,4-naphthylidene)dipropionate (NDPO2) or from hypochlorite/H2O2 was detected.Direct measurements of light emission due to the chemiluminescent transition of O2 (1δg)to the triplet ground state was monitored (a) by monomol emission in the near-infrared (1270 nm) with a liquid nitrogen cooled germanium diode and (b) by dimol emission in the visible spectral region (634 and 703 nm) with a red-sensitive photomultipler and photon counting.Chemical trapping of 1O2 generated by NDPO2 or by hypochlorite/H2O2 was used for quantification with the anthracene-9,10-diyldiethyl disulfate (EAS), yielding the endoperoxide (EASO2) as the specific oxidation product.The β value for EASO2 was calculated to be 7.7 x 1E-3 M and 8 x 1E-3 M when 1O2 was generated by NDPO2 or hypochlorite/H2O2, respectively.Due to the enhancement of the lifetime of 1O2, the β values were lower in D2O.The yields od 1O2 were measured, showing the one-half of the O2 liberated by thermolysis of NDPO2 was in the singlet state, whereas the yield for hypochlorite/H2O2 was near unity.The addition of 1,4-diazabicyclooctane (DABCO) increased dimol emission with a concomitant decrease of monomol light emission, but left the yield of EASO2 unchanged.Similar results were obtained with hypochlorite/H2O2.A calibration of the photoemission was performed, based on the 1O2 yield of NDPO2 thermodissociation.
