<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1405-888X</journal-id>
<journal-title><![CDATA[TIP. Revista especializada en ciencias químico-biológicas]]></journal-title>
<abbrev-journal-title><![CDATA[TIP]]></abbrev-journal-title>
<issn>1405-888X</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Facultad de Estudios Superiores Zaragoza]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-888X2006000100019</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Espectroscopía y teoría de la regioquímica en la nitración de las benzopiridinas]]></article-title>
<article-title xml:lang="en"><![CDATA[Spectroscopy and regiochemistry theory in the benzopyridines nitration]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez-Viesca]]></surname>
<given-names><![CDATA[Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Berros]]></surname>
<given-names><![CDATA[Martha]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,UNAM Facultad de Química División de Estudios de Posgrado]]></institution>
<addr-line><![CDATA[México, D.F ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2006</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2006</year>
</pub-date>
<volume>9</volume>
<numero>1</numero>
<fpage>19</fpage>
<lpage>29</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-888X2006000100019&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-888X2006000100019&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-888X2006000100019&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen En la presente comunicación se da una explicación teórica de la regioquímica observada en la nitración de las benzopiridinas, así como de los rendimientos relativos de los productos obtenidos. Se hizo una revisión de los métodos de preparación y de la espectroscopia de los compuestos estudiados. Un estudio cuidadoso de los espectros de RMN de 1H reveló la existencia en estos nitro compuestos de puentes de hidrógeno, del tipo C-H--'0-N=0, localizándose el átomo de hidrógeno en la posición peri al grupo nitro. La presencia de estas ligaduras secundarias explica los corrimientos a campo bajo observados en las señales de (dichos protones. Se determinaron los espectros de masas de la 5-nitro- y de la 8-nitroquinolina y se proponen los mecanismos de fragmentación de las rupturas típicas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract In this communication we provide a theoretical explanation to the regiochemistry in the nitration of the benzopyridines as well as to the relative yields of the obtained products. A review of the preparation procedures of the compounds under study is given, as well as the related spectroscopy. A careful study of 1 H NMR spectra revealed the existence of hydrogen bonds in these compounds. They are of the type &#1057;-&#919;-0-N=0, the hydrogen being at peri position to the nitro group. The existence of these bonds explains the down-field shifts observed in the signals of the involved protons. The mass spectra of 5-nitro- and 8-nitroquinoline were determined. The fragmentation mechanisms of the typical ruptures are advanced.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Espectrometría de masas]]></kwd>
<kwd lng="es"><![CDATA[nitroquinolinas]]></kwd>
<kwd lng="es"><![CDATA[nitroisoquinolinas]]></kwd>
<kwd lng="es"><![CDATA[puentes de hidrógeno]]></kwd>
<kwd lng="es"><![CDATA[resonancia magnética nuclear]]></kwd>
<kwd lng="en"><![CDATA[Hydrogen bonds]]></kwd>
<kwd lng="en"><![CDATA[mass spectrometry]]></kwd>
<kwd lng="en"><![CDATA[nitroquinolines]]></kwd>
<kwd lng="en"><![CDATA[nitroisoquinolines]]></kwd>
<kwd lng="en"><![CDATA[nuclear magnetic resonance]]></kwd>
</kwd-group>
</article-meta>
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