Six new naphthylphenols , bearing bulky hydroxymethyl substituents on the naphthalene, were synthesized and their photoreactivity was investigated by preparative irradiation, fluorescence measurements, and laser flash photolysis. All derivatives (in S1) undergo deprotonation of the phenolic OH in the aqueous solution. Also, fluorescence quenching with HClO4 in the pH range 2-4 indicates that can be protonated in S1. Formation of QMs most probably takes place sequentially, triggered by the phenol deprotonation. However, with the present data, a mechanism that involves simultaneous deprotonation and the loss of OH(-) cannot be ruled out. Photodehydration takes place only for , , and , delivering the corresponding QMs which react with nucleophilic solvents giving the corresponding photosolvolysis products. The other less likely option for the formation of the observed solvolysis products from , , and may involve some radical species. Photodehydration of and was not observed which may be due to the anticipated high energy of the corresponding sterically-congested and . The most efficient photosolvolyses were observed for the 2,6-substituted naphthalenes.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1039/c3pp50190f | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
α-Synuclein interaction with POPC/POPS vesicles.
Soft Matter
January 2025
Physical Chemistry, Chemistry Centre, Lund University, SE-22100 Lund, Sweden.
We have investigated the adsorption of the amyloid-forming protein α-Synuclein (αSyn) onto small unilamellar vesicles composed of a mixture of zwitterionic POPC and anionic POPS lipids. αSyn monomers adsorb onto the anionic lipid vesicles where they adopt an α-helical secondary structure. The degree of adsorption depends on the fraction of anionic lipid in the mixed lipid membrane, but one needs to consider the electrostatic shift of the serine p with increasing fraction of POPS.
View Article and Find Full Text PDFSong acquisition behavior observed in the songbird system provides a notable example of learning through trial- and-error which parallels human speech acquisition. Studying songbird vocal learning can offer insights into mechanisms underlying human language. We present a computational model of song learning that integrates reinforcement learning (RL) and Hebbian learning and agrees with known songbird circuitry.
View Article and Find Full Text PDFSeparation Time of Aluminothermic Reduction Products for Sustainable Silicon Production.
Open Res Eur
January 2025
Universidad Politecnica de Madrid Departamento de Ingenieria Geologica y Minera, Madrid, Community of Madrid, 28003, Spain.
Background: This work was carried out within the framework of the SisAl Pilot project, which is devoted to the environmentally friendly production of silicon. This new method relies on the aluminothermic reduction of quartz in slag, offering a more sustainable alternative to the traditional reduction of silica with carbon in submerged arc furnaces.
Methods: The process takes place in a rotary kiln producing silicon (Si) and alumina slag (actually, a CaO - Al O slag), which must be separated at the end to extract the silicon.
Solitary Osteochondroma in Uncommon Sites- A Rare Case Report.
J Orthop Case Rep
January 2025
Department of Orthopedics, Stanley Medical College, Chennai, Tamil Nadu, India.
Introduction: Osteochondroma is a bony lesion arising from the surface of the bone. It com-prises a large percentage of all benign bone tumors. A unique feature of this tumor is the conti-nuity of cortical and medullary components between the normal bony tissue and aberrant tissue of osteochondroma.
View Article and Find Full Text PDF.
Compr Psychoneuroendocrinol
November 2024
School of Social Sciences, University of Westminster, London, UK.
Cortisol awakening response (CAR) research relies upon self-collected saliva sampling during the post-awakening period. It is unknown how the CAR protocol is perceived and how they may affect typical routines relevant to CAR methodology. CAR assessment is sensitive to state variables, suggesting that CAR measurement may be affected by research participation.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!