{"id":11517,"date":"2022-11-28T04:26:49","date_gmt":"2022-11-27T20:26:49","guid":{"rendered":"https:\/\/www.pyrazoles-derivatives.com\/?p=11517"},"modified":"2022-11-28T04:26:49","modified_gmt":"2022-11-27T20:26:49","slug":"cox-paul-a-s-team-published-research-in-journal-of-the-american-chemical-society-in-138-cas-763120-58-7","status":"publish","type":"post","link":"https:\/\/www.pyrazoles-derivatives.com\/?p=11517","title":{"rendered":"Cox, Paul A.&#8217;s team published research in Journal of the American Chemical Society  in 138 | CAS: 763120-58-7"},"content":{"rendered":"<p>Cox, Paul A. published the artcile<b><i>Protodeboronation of Heteroaromatic, Vinyl, and Cyclopropyl Boronic Acids: pH-Rate Profiles, Autocatalysis, and Disproportionation<\/i><\/b>,  <a href=\"https:\/\/www.ambeed.com\/products\/763120-58-7.html\">Quality Control of 763120-58-7<\/a>,  the publication is  Journal of the American Chemical Society (2016), 138(29), 9145-9157, database is CAplus and MEDLINE.<\/p>\n<p>PH-rate profiles for aqueous-organic protodeboronation of 18 boronic acids, many widely viewed as unstable, have been studied by NMR and DFT. Rates were pH-dependent, and varied substantially between the boronic acids, with rate maxima that varied over 6 orders of magnitude. A mechanistic model containing five general pathways (k<sub>1<\/sub>-k<sub>5<\/sub>) has been developed, and together with input of [B]<sub>tot<\/sub>, K<sub>W<\/sub>, K<sub>a<\/sub>, and K<sub>aH<\/sub>, the protodeboronation kinetics can be correlated as a function of pH (1-13) for all 18 species. Cyclopropyl and vinyl boronic acids undergo very slow protodeboronation, as do 3- and 4-pyridyl boronic acids (t<sub>0.5<\/sub> &gt; 1 wk, pH 12, 70 \u00b0C). In contrast, 2-pyridyl and 5-thiazolyl boronic acids undergo rapid protodeboronation (t<sub>0.5<\/sub> \u2248 25-50 s, pH 7, 70 \u00b0C), via fragmentation of zwitterionic intermediates. Lewis acid additives (e.g., Cu, Zn salts) can attenuate (2-pyridyl) or accelerate (5-thiazolyl and 5-pyrazolyl) fragmentation. Two addnl. processes compete when the boronic acid and the boronate are present in sufficient proportions (pH = pK<sub>a<\/sub> \u00b1 1.6): (i) self-\/autocatalysis and (ii) sequential disproportionations of boronic acid to borinic acid and borane.<\/p>\n<p>Journal of the American Chemical Society published new progress about 763120-58-7. 763120-58-7 belongs to pyrazoles-derivatives, auxiliary class Pyrazole,Boronic acid and ester,Boronic Acids,Boronic acid and ester, name is 1H-Pyrazole-4-boronic acid, and the molecular formula is C3H5BN2O2, <a href=\"https:\/\/www.ambeed.com\/products\/763120-58-7.html\">Quality Control of 763120-58-7<\/a>.<\/p>\n<p>Referemce:<br \/><a href=\"https:\/\/en.wikipedia.org\/wiki\/Pyrazole\">https:\/\/en.wikipedia.org\/wiki\/Pyrazole<\/a>,<br \/><a href=\"Pyrazole - Wikipedia\">Pyrazoles &#8211; an overview | ScienceDirect Topics<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Journal of the American Chemical Society published new progress about 763120-58-7. 763120-58-7 belongs to pyrazoles-derivatives, auxiliary class Pyrazole,Boronic acid and ester,Boronic Acids,Boronic acid and ester, name is 1H-Pyrazole-4-boronic acid, and the molecular formula is C3H5BN2O2, <a href=\"https:\/\/www.ambeed.com\/products\/763120-58-7.html\">Quality Control of 763120-58-7<\/a>.<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[802,131],"tags":[732],"class_list":["post-11517","post","type-post","status-publish","format-standard","hentry","category-763120-58-7","category-pyrazoles-derivatives","tag-m-w100-150"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.9 - 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