{"id":11925,"date":"2023-01-04T08:11:31","date_gmt":"2023-01-04T00:11:31","guid":{"rendered":"https:\/\/www.pyrazoles-derivatives.com\/?p=11925"},"modified":"2023-01-04T08:11:31","modified_gmt":"2023-01-04T00:11:31","slug":"terekhova-m-i-et-al-published-their-research-in-khimiya-geterotsiklicheskikh-soedinenii-in-1979-cas-15953-73-8","status":"publish","type":"post","link":"https:\/\/www.pyrazoles-derivatives.com\/?p=11925","title":{"rendered":"Terekhova, M. I. et al. published their research in Khimiya Geterotsiklicheskikh Soedinenii in 1979 | CAS: 15953-73-8"},"content":{"rendered":"<p>Equilibrium nitrogen acidity of nitrogen heterocycles was written by Terekhova, M. I.;Petrov, E. S.;Rokhlina, E. M.;Kravtsov, D. N.;Shatenshtein, A. I.. And the article was included in Khimiya Geterotsiklicheskikh Soedinenii in 1979.<a href=\"https:\/\/www.ambeed.com\/products\/15953-73-8.html\">Application In Synthesis of 4-Chloro-3,5-dimethyl-1H-pyrazole<\/a> This article mentions the following:<\/p>\n<p>The acid pK values of 18 heterocycles were determined in Me<sub>2<\/sub>SO by spectral observation of the transmetalation equilibrium with indicator CH acids. The pK values ranged from 23.3 for pyrrole to 7.8 for 2,4,5-tribromoimidazole. The pK decreased as the number of N atoms in the ring and the number of annulated benzene rings increased. LFER between pK and \u03a3\u03c3<sub>m<\/sub> were found for imidazoles and pyrazoles. The pK were lower in MeOCH<sub>2<\/sub>CH<sub>2<\/sub>OMe than in Me<sub>2<\/sub>SO. In the experiment, the researchers used many compounds, for example, 4-Chloro-3,5-dimethyl-1H-pyrazole (cas: 15953-73-8<a href=\"https:\/\/www.ambeed.com\/products\/15953-73-8.html\">Application In Synthesis of 4-Chloro-3,5-dimethyl-1H-pyrazole<\/a>).<\/p>\n<p>4-Chloro-3,5-dimethyl-1H-pyrazole (cas: 15953-73-8) belongs to pyrazole derivatives. Pyrazoles, a five-membered heterocycle containing two adjacent nitrogen atoms, are the core structures found in a number of molecules that possess a wide range of pharmaceutical and agricultural activities. The presence of both electronegative nitrogen atoms in the pyrazole ring reduces the electron density of the C3- and C5-positions leaving electron density of C4-position unaltered. Thus the C4-position is vulnerable to electrophilic attack. The C3 electrophilic-position may undergo deprotonation in the presence of a strong base leading to ring opening.<a href=\"https:\/\/www.ambeed.com\/products\/15953-73-8.html\">Application In Synthesis of 4-Chloro-3,5-dimethyl-1H-pyrazole<\/a><\/p>\n<p>Referemce:<br \/><a href=\"https:\/\/en.wikipedia.org\/wiki\/Pyrazole\">Pyrazole &#8211; Wikipedia<\/a>,<br \/><a href=\"https:\/\/www.sciencedirect.com\/topics\/chemistry\/pyrazoles\">Pyrazoles &#8211; an overview | ScienceDirect Topics<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>4-Chloro-3,5-dimethyl-1H-pyrazole (cas: 15953-73-8) belongs to pyrazole derivatives. Pyrazoles, a five-membered heterocycle containing two adjacent nitrogen atoms, are the core structures found in a number of molecules that possess a wide range of pharmaceutical and agricultural activities. The presence of both electronegative nitrogen atoms in the pyrazole ring reduces the electron density of the C3- and C5-positions leaving electron density of C4-position unaltered. Thus the C4-position is vulnerable to electrophilic attack. The C3 electrophilic-position may undergo deprotonation in the presence of a strong base leading to ring opening.<a href=\"https:\/\/www.ambeed.com\/products\/15953-73-8.html\">Application In Synthesis of 4-Chloro-3,5-dimethyl-1H-pyrazole<\/a><\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[131],"tags":[128],"class_list":["post-11925","post","type-post","status-publish","format-standard","hentry","category-pyrazoles-derivatives","tag-100-200"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Terekhova, M. 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