منابع مشابه
On the photoelectron spectrum of p-benzoquinone
A high-resolution photoelectron spectrum of p-benzoquinone in the low energy ~9.5–11.5 eV! region is reported and analyzed with the aid of simulations based on high-level ab initio calculations. The results generally support the notion that the two prominent spectral features in this region are each due to a pair of final ion states. The lower energy feature beginning near 10 eV is due to oxyge...
متن کاملTransformation of acetaminophen by chlorination produces the toxicants 1,4-benzoquinone and N-acetyl-p-benzoquinone imine.
The reaction of the common pain reliever acetaminophen (paracetamol, 4-acetamidophenol) with hypochlorite was investigated over time under conditions that simulate wastewater disinfection. Initially, the reaction was studied in pure water at neutral pH (7.0), a range of reaction times (2-90 min), and a molar excess of hypochlorite (2-57 times) relative to the acetaminophen concentration. The re...
متن کاملAssignments of the II%* Singlet States of p-Benzoquinone
The vapor phase fluorescence spectra of p-benzoquinone-84 and & are reported and discussed in relation to the assignment of the low lying singlet states. The low temperature, polarized single crystal electronic absorption spectra of p-benzoquinone and several of its isotopic derivatives are reported. From the isotope shifts and band polarizations of the various vibronic origins, a detailed vibr...
متن کاملHypervalent iodine mediated synthesis of carbamate protected p-quinone monoimine ketals and p-benzoquinone monoketals.
A simple and efficient method for the synthesis of p-quinone monoimide ketals and p-benzoquinone monoketals by using a hypervalent iodine reagent, diacetoxyiodobenzene, has been developed. These two types of ketals are achieved from a single starting material by varying the reaction conditions.
متن کاملThe Conversion of P-hydroxybenzaldehyde to the Benzoquinone Ring of Ubiquinone in Rhodospirillum Rubrum.
The pathways involved in the biosynthesis of the benzoquinone ring of the ubiquinones have not been established. Recognition of the inability of mammals to synthesize aromatic rings de nova has led to the supposition that, in mammals, the benzoquinone ring of the ubiquinones arises from dietary aromatic amino acids. In support of this theory, Bentley et al. (1) administered phenylalanine-U-Cl4 ...
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ژورنال
عنوان ژورنال: Acta Chemica Scandinavica
سال: 1954
ISSN: 0904-213X
DOI: 10.3891/acta.chem.scand.08-1943