<?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>1870-249X</journal-id>
<journal-title><![CDATA[Journal of the Mexican Chemical Society]]></journal-title>
<abbrev-journal-title><![CDATA[J. Mex. Chem. Soc]]></abbrev-journal-title>
<issn>1870-249X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Química de México A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1870-249X2006000200001</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Effect of Aryl Substituents on the Reactivity of the Captodative Olefins 1-Acetylvinyl Arenecarboxylates]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mendoza]]></surname>
<given-names><![CDATA[Jorge A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Pérez]]></surname>
<given-names><![CDATA[Enrique]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jiménez-Vázquez]]></surname>
<given-names><![CDATA[Hugo A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tamariz]]></surname>
<given-names><![CDATA[Joaquín]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Politécnico Nacional Escuela Nacional de Ciencias Biológicas Departamento de Química Orgánica]]></institution>
<addr-line><![CDATA[México Distrito Federal]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2006</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2006</year>
</pub-date>
<volume>50</volume>
<numero>2</numero>
<fpage>47</fpage>
<lpage>56</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-249X2006000200001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-249X2006000200001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-249X2006000200001&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[With the aim of evaluating the effect of substitution at the aryl moiety of the aroyloxy group of captodative olefins 1 on their reactivity in Diels-Alder and other reactions, the new series of olefins 1-acetylvinyl arenecarboxylates 1c-1k were prepared. No correlation was found between 13C NMR chemical shifts of the carbon atoms of the double bond and the electronic effects of the diverse substituents. However, an excellent correlation was observed between the energies of the FMOs (HF/6-31G*), or the corresponding atomic coefficients or the Mülliken charges at the carbon atoms of the double bond, and the Hammett &#963;m and &#963;p constants of the phenyl ring substituents of some members of the series, and of some other calculated analogues. These results strongly suggest that, in addition to the major effect of the electron-withdrawing group, the reactivity of captodative olefins 1 is also controlled by the long-range inductive effects of the sub­stituent at the phenyl ring of the aroyloxy group.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Con el objeto de evaluar el efecto de la sustitución del fragmento arilo del grupo aroiloxi de las olefinas captodativas 1 sobre su reactividad en reacciones de Diels-Alder y otras reacciones, se pre­paró la nueva serie de olefinas 1-acetilvinil arencarboxilatos 1c-1k. No se encontró correlación alguna entre los desplazamientos químicos en RMN de 13C de los átomos de carbono del doble enlace y los efectos electrónicos de los diversos sustituyentes. Sin embargo, se encontró una excelente correlación entre las energías de los OMF (HF/6-31G*), o los coeficientes atómicos correspondientes o las car­gas de Mülliken en los átomos de carbono del doble enlace, y las constantes de Hammett &#963;m y &#963;p de los sustituyents del grupo fenilo de algunos miembros de la serie, y para algunos otros compuestos análo­gos que fueron calculados. Estos resultados sugieren fuertemente que además del efecto dominante del grupo electroatractor, la reactividad de las olefinas captodativas 1 está también controlada por el efecto inductivo a larga distancia de los sustituyentes en el fenilo del grupo aroiloxi.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Captodative olefins]]></kwd>
<kwd lng="en"><![CDATA[1-acetylvinyl arenecarboxylates]]></kwd>
<kwd lng="en"><![CDATA[FMO]]></kwd>
<kwd lng="en"><![CDATA[Hammett constants]]></kwd>
<kwd lng="en"><![CDATA[inductive effects]]></kwd>
<kwd lng="es"><![CDATA[Olefinas captodativas]]></kwd>
<kwd lng="es"><![CDATA[1-acetilvinil arencarboxilatos]]></kwd>
<kwd lng="es"><![CDATA[OMF]]></kwd>
<kwd lng="es"><![CDATA[constantes de Hammett]]></kwd>
<kwd lng="es"><![CDATA[efectos inductivos]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Article</font>	</p>     <p align="justify">&nbsp;</p> 	    <p align="center"><font face="verdana" size="4"><b>Effect of Aryl Substituents on the Reactivity of the Captodative Olefins 1-Acetylvinyl Arenecarboxylates</b></font></p>     <p align="center">&nbsp;</p> 	    <p align="center"><font face="verdana" size="2"> <strong>Jorge A. Mendoza, Enrique Garc&iacute;a-P&eacute;rez, Hugo A. Jim&eacute;nez-V&aacute;zquez*, and Joaqu&iacute;n Tamariz*</strong></font></p>     <p align="center">&nbsp;</p> 	    <p align="justify"><font face="verdana" size="2"> <em>Departamento de Qu&iacute;mica Org&aacute;nica, Escuela Nacional de Ciencias Biol&oacute;gicas, Instituto Polit&eacute;cnico Nacional, Prol. de Carpio y Plan de Ayala, 11340 M&eacute;xico, D.F., M&eacute;xico. Tels: (+5255) 5729-6300/62411 and (+5255) 5729-6300/62412; Fax: (+5255) 5396-3503;</em> <a href="mailto:jtamariz@woodward.encb.ipn.mx">jtamariz@woodward.encb.ipn.mx</a> and <a href="mailto:hjimenez@woodward.encb.ipn.mx">hjimenez@woodward.encb.ipn.mx</a></font></p>     <p align="justify">&nbsp;</p> 	    <p align="justify"><font face="verdana" size="2"> Recibido el 23 de abril del 2006.    ]]></body>
<body><![CDATA[<br> 	</font><font face="verdana" size="2">Aceptado el 6 de junio del 2006.</font></p>     <p align="justify">&nbsp;</p> 	    <p align="justify"><font face="verdana" size="2"> <b>Abstract</b></font></p> 	    <p align="justify"><font face="verdana" size="2"> With the aim of evaluating the effect of substitution at the aryl moiety of the aroyloxy group of captodative olefins <b>1</b> on their reactivity in Diels-Alder and other reactions, the new series of olefins 1-acetylvinyl arenecarboxylates <b>1c-1k</b> were prepared. No correlation was found between <sup>13</sup>C NMR chemical shifts of the carbon atoms of the double bond and the electronic effects of the diverse substituents. However, an excellent correlation was observed between the energies of the FMOs (HF/6-31G*), or the corresponding atomic coefficients or the M&uuml;lliken charges at the carbon atoms of the double bond, and the Hammett <i>&sigma;<sub>m</sub></i> and &sigma;<sub><em>p</em></sub> constants of the phenyl ring substituents of some members of the series, and of some other calculated analogues. These results strongly suggest that, in addition to the major effect of the electron-withdrawing group, the reactivity of captodative olefins <b>1</b> is also controlled by the long-range inductive effects of the sub&shy;stituent at the phenyl ring of the aroyloxy group.</font></p> 	    <p align="justify"><font face="verdana" size="2"> <b>Key words:</b> Captodative olefins, 1-acetylvinyl arenecarboxylates, FMO, Hammett constants, inductive effects.</font></p> 	    <p align="justify">&nbsp;</p>     <p align="justify"><font face="verdana" size="2"> <b>Resumen</b></font></p> 	    <p align="justify"><font face="verdana" size="2"> Con el objeto de evaluar el efecto de la sustituci&oacute;n del fragmento arilo del grupo aroiloxi de las olefinas captodativas <b>1</b> sobre su reactividad en reacciones de Diels-Alder y otras reacciones, se pre&shy;par&oacute; la nueva serie de olefinas 1-acetilvinil arencarboxilatos <b>1c-1k.</b> No se encontr&oacute; correlaci&oacute;n alguna entre los desplazamientos qu&iacute;micos en RMN de <sup>13</sup>C de los &aacute;tomos de carbono del doble enlace y los efectos electr&oacute;nicos de los diversos sustituyentes. Sin embargo, se encontr&oacute; una excelente correlaci&oacute;n entre las energ&iacute;as de los OMF (HF/6-31G*), o los coeficientes at&oacute;micos correspondientes o las car&shy;gas de M&uuml;lliken en los &aacute;tomos de carbono del doble enlace, y las constantes de Hammett <i>&sigma;<sub>m</sub></i> y<i> &sigma;<sub>p</sub></i> de los sustituyents del grupo fenilo de algunos miembros de la serie, y para algunos otros compuestos an&aacute;lo&shy;gos que fueron calculados. Estos resultados sugieren fuertemente que adem&aacute;s del efecto dominante del grupo electroatractor, la reactividad de las olefinas captodativas <b>1</b> est&aacute; tambi&eacute;n controlada por el efecto inductivo a larga distancia de los sustituyentes en el fenilo del grupo aroiloxi.</font></p> 	    <p align="justify"><font face="verdana" size="2"> <b>Palabras clave:</b> Olefinas captodativas, 1-acetilvinil arencarboxilatos, OMF, constantes de Hammett, efectos inductivos. </font></p> 	    <p align="justify">&nbsp;</p> 	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><a href="/pdf/jmcs/v50n2/v50n2a1.pdf" target="_blank">DESCARGAR ARCHIVO EN FORMATO PDF</a></font></p> 	    <p align="justify">&nbsp;</p> 	    <p align="justify"><font face="verdana" size="2"><b>Acknowledgments     </b></font></p> 	    <p align="justify"><font face="verdana" size="2">We thank Fernando Labarrios for his help in spectrometric  	  measurements. J.T. would like to acknowledge SIP-IPN  	  (Grants 921769 and 200410) and CONACYT (Grants 1570P,  	  32273-E, and 43508-Q) for financial support. H.A.J.-V.  	  thanks CONACYT (Grant 3251P) for financial support. J.M.	  	  and E.G.-P, are grateful to CONACYT (Grants 86038 and  	  91989) for graduate fellowships, and to the PIFI-IPN program	  for scholarships. J.M. also thanks the Ludwig K. Hellweg	  Foundation for a partial scholarship. J.T. and H.A.J.-V. are	  fellows of the EDI/IPN and COFAA/IPN programs.     </font></p> 	    <p align="justify">&nbsp;</p> 	    <p align="justify"><font face="verdana" size="2"><strong>References and Notes</strong></font></p> 	    <!-- ref --><p align="justify"><font face="verdana" size="2">1. (a) Reyes, A.; Aguilar, R.; Mu&ntilde;oz, A. H.; Zwick, J.-C.; Rubio, 	  M.; Escobar, J.-L.; Soriano, M.; Toscano, R.; Tamariz, J. <em>J.</em> <em>Org 	  Chem.</em> <strong>1990</strong>, 55, 1024-1034.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4894037&pid=S1870-249X200600020000100001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --> (b) Aguilar, R.; Reyes, A.; Tamariz, 	  J.; Birbaum, J.-L. <em>Tetrahedron Lett.</em> <strong>1987</strong>, 28, 865-868.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4894038&pid=S1870-249X200600020000100002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --> (c) 	  Garc&iacute;a de Alba, O.; Chanona, J.; Delgado, F.; Zepeda, G.;     Labarrios, F.; Bates, R. W.; Bott, S.; Juaristi, E.; Tamariz, J.<em> Anal. Qu&iacute;m., Int. Ed.</em> <strong>1996</strong>, 92, 108-117.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4894039&pid=S1870-249X200600020000100003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --> </font></p>     ]]></body>
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