Abstract The aim of the present study was to develop a level of competence that is not normally found in graduate or post-graduate chemistry courses, through a didactic intervention in the discipline of spectrometric analysis of organic compounds. The methodology of the work consisted in the analysis of a sample of a compound unknown individually by each student. Whereas organic compounds spectroscopy is most often learned and practiced, this intervention allows students to become comfortable with 1H and 13C NMR, and IR spectroscopy, in addition to mass spectrometry. Throughout the didactic intervention the students, through a thematic seminary, presented the results of the analysis of the spectra from the different techniques used. With the skills acquired from completing this laboratory work, the students become well-prepared to perform spectroscopic analyzes in subsequent experiments encountered in the organic chemistry laboratory.

Resumen El objetivo del presente estudio fue desarrollar un nivel de competencia que no se encuentra normalmente en los cursos de química de posgrado o postgrado, a través de una intervención didáctica en la disciplina de análisis espectrométrico de compuestos orgánicos. La metodología del trabajo consistió en el análisis de muestra de compuesto desconocido individualmente por cada estudiante. Mientras que la espectroscopía de compuestos orgánicos es más a menudo aprendida y practicada, la intervención permite que los estudiantes se sientan cómodos con la RMN 1H y 13C, y la espectroscopía IR, además de la espectrometría de masas. A lo largo de la intervención didáctica los estudiantes a través del seminario temático presentaron los resultados del análisis de los espectros de las diferentes técnicas utilizadas. Con las habilidades adquiridas de completar este laboratorio, están bien preparados para realizar análisis espectroscópicos en experimentos posteriores encontrados en el laboratorio de química orgánica.

Resumo: Partindo das ideias de Bakhtin e inserindo-as no quadro mais amplo dos estudos discursivos, este trabalho analisa os elementos dos gêneros de discurso encontrado em textos de livros didáticos de química. Foram analisados 12 livros de química, destinados a estudantes da 1.a série do ensino médio, de escolas públicas e particulares. Três livros foram recomendados pelo Programa Nacional do Livro Didático (PNLD) 2012 e escolhidos por um número expressivo de professores da rede pública. O conteúdo objeto do estudo foi: ligações químicas. Foi possível identificar recapitulações, chamadas e metáforas (elementos do gênero didático); descrição, classificação, explicação e definição (elementos do gênero científico). O elemento contextualização foi pouco descrito nos livros analisadas. O uso de metáforas foi predominante no livro H.

Abstract: Using the ideas of Bakhtin and inserting them in the broader frame of discursive studies, this paper analyzes the elements of discursive genres found in chemistry textbooks texts. Chemistry twelve books were analyzed, aimed at students of the first high school series of public and private schools. Three books have been recommended by the National Textbook Program ‒ PNLD/2012 and chosen by a large number of public school teachers. The object of the study was content Chemical Bonds. It was possible to identify recaps, calls and metaphors (the didactic genre elements); description, classification, explanation and definition (the scientific genre elements). The context element was just described in the analyzed books. The use of metaphor was predominant in the book H.

We describe the application of an amidoxime as catalyst in the synthesis of homoallylic alcohols from the allylation reaction of aldehydes with different features using potassium allyltrifluoroborate. The reaction was conducted with a catalytic amount of the appropriate amidoxime in a biphasic system (water:dichloromethane), open atmosphere and ambient temperature. The products were obtained in yields ranging from moderate to excellent in short reaction times without the need for further purifications for almost all examples. Additionally, the reaction has proved chemo- and regioselective.