Representations in Organic Chemistry Textbooks: Nucleophilic Substitution and Elimination Reactions of Alkyl Halides

Öz

Nucleophilic substitution and elimination reactions of alkyl halides are one of the major reactions encountered many times in organic chemistry course content. It is important to include different representations of these reactions, which have an essential place in organic chemistry lessons, in the textbooks, and to integrate them. Therefore, this study aims to reveal what kind of representations are used regarding the nucleophilic substitution and elimination reactions of alkyl halides in textbooks frequently used in organic chemistry courses in the departments of Chemistry Education in Turkey. For this purpose, how these reactions were represented according to verbal, symbolic, and visual representation types in four textbooks was examined descriptively. Analysis results revealed that verbal representations were mostly used in both substitution and elimination reactions, followed by symbolic representation. Furthermore, the study showed that visual representations were given extremely little space in all textbooks, even in very abstract subject content such as stereochemistry. Finally, the study revealed that there were fewer visual representations in elimination reactions than nucleophilic substitution reactions.

Anahtar Kelimeler

• alkyl halides
• textbook
• elimination reactions
• nucleophilic substitution reactions
• organic chemistry

Organik Kimya Ders Kitaplarındaki Gösterimler: Alkil Halojenürlerin Nükleofilik Yer Değiştirme ve Ayrılma Tepkimeleri

Öz

Alkil halojenürlerin nükleofilik yer değiştirme ve ayrılma tepkimeleri, organik kimya dersi içerisinde pek çok kez karşılaşılan temel tepkimelerin başında gelmektedir. Bu açıdan ders kitaplarında organik kimya dersi açısından son derece önemli yere sahip olan bu tepkimelerde farklı gösterimlere yer verilmesi ve bunların birbiriyle bütünleştirilmesi önem taşımaktadır. Bu nedenle, bu araştırmada Türkiye’deki Kimya Eğitimi Anabilim Dallarında organik kimya derslerinde sıklıkla yararlanılan ders kitaplarında alkil halojenürlerin nükleofilik yer değiştirme ve ayrılma tepkimelerine ilişkin ne tür gösterimlerin kullanıldığının ortaya konulması amaçlanmıştır. Bu amaçla, dört ders kitabında bu tepkimelerin sözel, sembolik ve görsel gösterim türlerine göre nasıl temsil edildiği betimsel olarak incelenmiştir. Analiz sonuçları, hem yer değiştirme hem de ayrılma tepkimelerinde en çok sözel gösterimlere yer verildiğini, bunun ardından sembolik gösterimin geldiğini ortaya koymuştur. Ayrıca araştırmada stereokimya gibi oldukça soyut olan konu içeriğinde dahi görsel gösterimlere tüm ders kitaplarında son derece az yer verildiği belirlenmiştir. Son olarak araştırma, ayırma reaksiyonlarında nükleofilik yer değiştirme reaksiyonlarından daha az görsel temsil olduğunu ortaya koymuştur.

Anahtar Kelimeler

• Alkil halojenürler
• ayrılma
• ders kitabı
• nükleofilik yer değiştirme
• organik kimya

Kaynakça

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