<?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>S1870-249X2007000400015</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Enantioselective Addition of Et2Zn to Benzaldehyde Activated by Benzamides Containing the (S)-&#945;-Phenylethyl Group]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Huelgas]]></surname>
<given-names><![CDATA[Gabriela]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Quintero]]></surname>
<given-names><![CDATA[Leticia]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Anaya de Parrodi]]></surname>
<given-names><![CDATA[Cecilia]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de las Américas Departamento de Ciencias Químico-Biológicas ]]></institution>
<addr-line><![CDATA[Cholula Puebla]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Benemérita Universidad Autónoma de Puebla Facultad de Ciencias Químicas ]]></institution>
<addr-line><![CDATA[Puebla ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2007</year>
</pub-date>
<volume>51</volume>
<numero>4</numero>
<fpage>249</fpage>
<lpage>251</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-249X2007000400015&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-249X2007000400015&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-249X2007000400015&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Application of atropisomeric ligands, i.e. 2-aminobenzamides 1a-e and 2-sulfonamidobenzamides 2a-e, in the addition of Et2Zn to benzaldehyde afforded low to moderate enantioselectivities (up to 63% ee).]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[La aplicación de los ligantes atropoisoméricos, 2-aminoobenzamidas 1a-e y 2-sulfonamidobenzamidas 2a-e, en la adición de Et2Zn a benzaldehído condujo a enantioselectividades de bajas a moderadas (hasta 63% ee).]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[atropisomers]]></kwd>
<kwd lng="en"><![CDATA[benzamides]]></kwd>
<kwd lng="en"><![CDATA[chiral ligands]]></kwd>
<kwd lng="en"><![CDATA[diethylzinc]]></kwd>
<kwd lng="en"><![CDATA[enantioselective addition]]></kwd>
<kwd lng="es"><![CDATA[atropoisómeros]]></kwd>
<kwd lng="es"><![CDATA[benzamidas]]></kwd>
<kwd lng="es"><![CDATA[ligantes quirales]]></kwd>
<kwd lng="es"><![CDATA[dietilzinc]]></kwd>
<kwd lng="es"><![CDATA[adición enantioselectiva]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Article</font></p>      <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="4"><b>Enantioselective Addition of Et<sub>2</sub>Zn to Benzaldehyde Activated by Benzamides Containing the (<i>S</i>)&#45;&#945;&#45;Phenylethyl Group</b></font></p>  	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>Gabriela Huelgas,<sup>1,2</sup> Leticia Quintero,<sup>2</sup> Cecilia Anaya de Parrodi*<sup>1</sup></b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><sup>1</sup>&nbsp;<i>Universidad de las Am&eacute;ricas Puebla, Departamento de Ciencias Qu&iacute;mico&#45;Biol&oacute;gicas, Santa Catarina M&aacute;rtir s/n, C.P. 72820, Cholula, Puebla, M&eacute;xico. Telephone: +(52)222&#45;229 2670, Fax: +(52)222&#45;229 2419</i>, e&#45;mail: <a href="mailto:cecilia.anaya@udlap.mx">cecilia.anaya@udlap.mx</a></font></p>  	    <p align="justify"><font face="verdana" size="2"><sup>2</sup>&nbsp;<i>Benem&eacute;rita Universidad Aut&oacute;noma de Puebla, Facultad de Ciencias Qu&iacute;micas, Av. San Claudio y 14 Sur, C.P. 72570, Puebla, Puebla, M&eacute;xico.</i></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Recibido el 4 de octubre de 2007    <br> 	Aceptado el 19 de diciembre de 2007</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Application of atropisomeric ligands, i.e. 2&#45;aminobenzamides <b>1a&#45;e</b> and 2&#45;sulfonamidobenzamides <b>2a&#45;e,</b> in the addition of Et<sub>2</sub>Zn to benzaldehyde afforded low to moderate enantioselectivities (up to 63% ee).</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> atropisomers, benzamides, chiral ligands, diethylzinc, enantioselective addition.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p> 	    <p align="justify"><font face="verdana" size="2">La aplicaci&oacute;n de los ligantes atropoisom&eacute;ricos, 2&#45;aminoobenzamidas <b>1a&#45;e</b> y 2&#45;sulfonamidobenzamidas <b>2a&#45;e,</b> en la adici&oacute;n de Et<sub>2</sub>Zn a benzaldeh&iacute;do condujo a enantioselectividades de bajas a moderadas (hasta 63% ee).</font></p>      <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> atropois&oacute;meros, benzamidas, ligantes quirales, dietilzinc, adici&oacute;n enantioselectiva.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><a href="/pdf/jmcs/v51n4/v51n4a15.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Acknowledgments</b></font></p>  	    <p align="justify"><font face="verdana" size="2">We thank CONACYT, Consejo Nacional de Ciencia y Tecnolog&iacute;a (Project No. 55802 and GH scholarship No 144893) for financial support.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>References</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">1.&nbsp;Mukaiyama, T.; Soai, K.; Sato, T.; Shimizu, H.; Suzuki, K. <i>J. Am. Chem. 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