{"id":12241,"date":"2023-02-13T04:17:49","date_gmt":"2023-02-12T20:17:49","guid":{"rendered":"https:\/\/www.pyrazoles-derivatives.com\/?p=12241"},"modified":"2023-02-13T04:17:49","modified_gmt":"2023-02-12T20:17:49","slug":"luijten-w-c-m-m-et-al-published-their-research-in-organic-mass-spectrometry-in-1982-cas-5334-39-4","status":"publish","type":"post","link":"https:\/\/www.pyrazoles-derivatives.com\/?p=12241","title":{"rendered":"Luijten, W. C. M. M. et al. published their research in Organic Mass Spectrometry in 1982 | CAS: 5334-39-4"},"content":{"rendered":"<p>Mass spectrometry of nitroazoles. 4. Ortho effects: the loss of CHO\u95b3?and formaldehyde from methyl-substituted nitrodiazoles was written by Luijten, W. C. M. M.;Van Thuijl, J.. And the article was included in Organic Mass Spectrometry in 1982.<a href=\"https:\/\/www.ambeed.com\/products\/5334-39-4.html\">Recommanded Product: 5334-39-4<\/a> This article mentions the following:<\/p>\n<p>The interaction between Me and NO<sub>2<\/sub> groups in some Me-substituted nitropyrazoles and -imidazoles caused the expulsion of CHO\u95b3?and HCHO during electron-impact mass spectroscopy. This occurred when the 2 substituents were adjacent. Labeling with D and <sup>13<\/sup>C showed that the loss of CHO\u95b3?and HCHO originates exclusively from the substituents. The isotope effects observed in partially deuterated 3(5)-methyl-4-nitropyrazole were consistent with H transfer prior to fragmentation. In the experiment, the researchers used many compounds, for example, 3-Methyl-4-nitro-1H-pyrazole (cas: 5334-39-4<a href=\"https:\/\/www.ambeed.com\/products\/5334-39-4.html\">Recommanded Product: 5334-39-4<\/a>).<\/p>\n<p>3-Methyl-4-nitro-1H-pyrazole (cas: 5334-39-4) belongs to pyrazole derivatives. The 1H-pyrazole provides an excellent means by which to provide the requisite hydrogen bond acceptor\u95b3\u30e6\u5f86onor motifs, whether as a monocyclic ring or as a fused indazole ring. 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\/5334-39-4.html\">Recommanded Product: 5334-39-4<\/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>3-Methyl-4-nitro-1H-pyrazole (cas: 5334-39-4) belongs to pyrazole derivatives. The 1H-pyrazole provides an excellent means by which to provide the requisite hydrogen bond acceptor\u95b3\u30e6\u5f86onor motifs, whether as a monocyclic ring or as a fused indazole ring. 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\/5334-39-4.html\">Recommanded Product: 5334-39-4<\/a><\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[216,131],"tags":[128],"class_list":["post-12241","post","type-post","status-publish","format-standard","hentry","category-5334-39-4","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>Luijten, W. C. M. M. et al. published their research in Organic Mass Spectrometry in 1982 | CAS: 5334-39-4 | pyrazoles-derivatives<\/title>\n<meta name=\"description\" content=\"Mass spectrometry of nitroazoles. 4. Ortho effects: the loss of CHO\u95b3?and formaldehyde from methyl-substituted nitrodiazoles was written by Luijten, W. C. M. M.;Van Thuijl, J.. And the article was included in Organic Mass Spectrometry in 1982.Recommanded Product: 5334-39-4 This article mentions the following:\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.pyrazoles-derivatives.com\/?p=12241\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Luijten, W. C. M. M. et al. published their research in Organic Mass Spectrometry in 1982 | CAS: 5334-39-4 | pyrazoles-derivatives\" \/>\n<meta property=\"og:description\" content=\"Mass spectrometry of nitroazoles. 4. Ortho effects: the loss of CHO\u95b3?and formaldehyde from methyl-substituted nitrodiazoles was written by Luijten, W. C. M. M.;Van Thuijl, J.. 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