<?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>0370-3908</journal-id>
<journal-title><![CDATA[Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. acad. colomb. cienc. exact. fis. nat.]]></abbrev-journal-title>
<issn>0370-3908</issn>
<publisher>
<publisher-name><![CDATA[Academia Colombiana de Ciencias Exactas, Físicas y Naturales]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0370-39082021000401232</article-id>
<article-id pub-id-type="doi">10.18257/raccefyn.1465</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Using a warm dioxane/MeOH/NaBH4 mixture as convenient medium for the selective chemical reduction of the C=C double bond in &#945;,&#946;-unsaturated systems]]></article-title>
<article-title xml:lang="es"><![CDATA[Uso de una mezcla dioxane/MeOH/NaBH4 en caliente como un medio conveniente para la reducción química selectiva del doble enlace C=C en sistemas &#945;,&#946;-insaturados]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Abonia]]></surname>
<given-names><![CDATA[Rodrigo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Garcia]]></surname>
<given-names><![CDATA[Andres C.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad del Valle Department of Chemistry Research Group of Heterocyclic Compounds]]></institution>
<addr-line><![CDATA[Cali ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad del Valle Department of Chemistry ]]></institution>
<addr-line><![CDATA[Cali ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<volume>45</volume>
<numero>177</numero>
<fpage>1232</fpage>
<lpage>1245</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0370-39082021000401232&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0370-39082021000401232&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0370-39082021000401232&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Diversely substituted Knoevenagel products were subjected to reduction with NaBH4 in MeOH/p-dioxane solution at 70 oC. Selectively reduction of their C=C double bond was achieved in all cases. Reduction conditions tolerated a variety of functional groups although simple aldolic or Claisen-Schmidt products showed to be less selective toward C=C reduction and on the contrary C=O bond was reduced under these reaction conditions. Additionally, selectivity of the NaBH4-mediated chemical reduction was compared with the classical Raney-Nickel-mediated catalytic hydrogenation in order to find similarities and differences. Moreover, trying to explain the selective NaBH4-mediated reductive process a plausible mechanistic pathway was proposed in this regard.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Productos de Knoevenagel diversamente sustituidos fueron sometidos a reducción con una solución de NaBH4 en MeOH/p-dioxano a 70 oC. A través de este proceso, se alcanzó la reducción selectiva de sus dobles enlaces C=C en todos los casos. Las condiciones de reducción establecidas toleró una variedad de grupos funcionales, aunque productos simples de condensación aldólica o de Claisen-Schmidt mostraron menos selectividad hacia la reducción del doble enlace C=C, y por el contrario, condujo específicamente a la reducción de los grupos C=O. Adicionalmente, la selectividad de nuestras condiciones de reducción mediadas por NaBH4 fue comparada con la clásica hidrogenación catalítica mediada por Raney-Nickel para encontrar algunas similitudes y diferencias. Así mismo, se propuso una secuencia de pasos mecanísticos, con el fin de intentar explicar el proceso de reducción selectiva mediada por NaBH4.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Chalcones]]></kwd>
<kwd lng="en"><![CDATA[Knoevenagel products]]></kwd>
<kwd lng="en"><![CDATA[&#945;,&#946;-Unsaturated systems]]></kwd>
<kwd lng="en"><![CDATA[Selective reductions]]></kwd>
<kwd lng="en"><![CDATA[NaBH4-mediate reductions]]></kwd>
<kwd lng="en"><![CDATA[Catalytic hydrogenation]]></kwd>
<kwd lng="es"><![CDATA[Chalconas]]></kwd>
<kwd lng="es"><![CDATA[Productos de condensación de Knoevenagel]]></kwd>
<kwd lng="es"><![CDATA[Sistemas &#945;,&#946;-insaturados]]></kwd>
<kwd lng="es"><![CDATA[Reducciones selectivas]]></kwd>
<kwd lng="es"><![CDATA[Reducciones mediadas por NaBH4]]></kwd>
<kwd lng="es"><![CDATA[Hidrogenación catalítica]]></kwd>
</kwd-group>
</article-meta>
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