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Dental and Maxillofacial Surgery Applications of Polymers
Published in Severian Dumitriu, Valentin Popa, Polymeric Biomaterials, 2020
It needs to be recognized that not all double bonds react in free radical addition polymerization. In the case of the polymerization of methyl methacrylate, there is always a certain amount of residual monomer. This may have deleterious biological consequences. In the case of dimethacrylates, the degree of conversion of –C=C– bonds may influence biocompatibility, mechanical properties and durability of the material [11].
An Insight into Green Microwave-Assisted Techniques
Published in Banik Bimal Krishna, Bandyopadhyay Debasish, Advances in Microwave Chemistry, 2018
Natalia A. Gomez, Maite V. Aguinaga, Natalia Llamas, Mariano Garrido, Carolina Acebal, Claudia Domini
AOPs refer to chemical procedures that are able to generate highly reactive free radicals, especially the hydroxyl and hydroperoxyl radicals (⋅OH, ⋅HOO) and the superoxide radical anion (⋅O2−), which can degrade many persistent organic pollutants. Once generated, these free radicals can react with organic compounds by electron transfer, radical addition and/or hydrogen abstraction [26]. The AOPs have certain advantages such as high reaction rates, elevated oxidation potential and non-selective oxidation, which means that multiple pollutants can be simultaneously treated [26–28]. Figure 3.2 shows a scheme with the most common AOPs used to degrade different organic compounds [26].
A walk around the decarboxylative C-S cross-coupling reactions
Published in Journal of Sulfur Chemistry, 2019
Akram Hosseinian, Parvaneh Delir Kheirollahi Nezhad, Sheida Ahmadi, Zahra Rahmani, Aazam Monfared
Inspired by this work, Rokade and Prabhu discovered that heating of cinnamic acids 53 with aromatic sulfinic acid sodium salts 54 in the presence of a catalytic amount of |Cu(ClO4)2+6H2O, 1,10-phenanthroline as a ligand, and TBHP as an oxidant in MeCN afforded corresponding vinyl sulfones 55 in modestly poor to good yields (Scheme 25) [41]. It is important to note that the reaction is effective only with electron-rich cinnamic acids (except with OH and NH2 substitution). Interestingly, the products were isolated exclusively in the E-form even from cis-cinnamic acids. A gram-scale reaction was also successfully reported. Mechanistically the reactions proceed via the radical addition-elimination mechanism (Scheme 26).