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Chapitre 3

Alcanes et cycloalcanes

Structure des alcanes
Structure des alcanes
The formation of carbon-carbon bonds leading to the creation of the carbon chain is the basis of organic chemistry. August Kekulé and Archibald Scott ...
Isomères constitutionnels des alcanes
Isomères constitutionnels des alcanes
Organic compounds of the same molecular formula can have different structural formulas called constitutional isomers, and the phenomenon is known as ...
Nomenclature des alcanes
Nomenclature des alcanes
In the late 19th-century, the number of new chemical compounds discovered increased tremendously. Hence, the necessity arose to develop a naming system ...
Propriétés physiques des alcanes
Propriétés physiques des alcanes
Alkanes are nonpolar molecules due to the presence of only carbon and hydrogen atoms. The electronegativity difference between carbon and hydrogen is ...
Projections de Newman
Projections de Newman
Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used ...
Conformations de l'éthane et du propane
Conformations de l'éthane et du propane
In an organic molecule, free rotation about the carbon-carbon single bond results in energetically different conformers of the molecule. Due to this ...
Conformations du butane
Conformations du butane
Unlike ethane and propane that have only two major conformations, butane has more than two conformers. The staggered form of butane in which the bulky ...
Cycloalcanes
Cycloalcanes
Cycloalkanes are saturated cyclic hydrocarbons with carbon atoms arranged in the form of rings. They have two fewer hydrogen atoms than the corresponding ...
Conformations des cycloalcanes
Conformations des cycloalcanes
Adolf von Baeyer attempted to explain the instabilities of small and large cycloalkane rings using the concept of angle strain — the strain caused ...
Conformations du cyclohexane
Conformations du cyclohexane
Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts ...
Conformation chaise du cyclohexane
Conformation chaise du cyclohexane
The chair conformation is the most stable form of cyclohexane due to the absence of angle and torsional strain. The absence of angle strain is a result of ...
Stabilité des cyclohexanes substitués
Stabilité des cyclohexanes substitués
This lesson discusses the stability of substituted cyclohexanes with a focus on energies of various conformers and the effect of 1,3-diaxial ...
Cyclohexanes disubstitués : isomérie <em> cis-trans</em>
Cyclohexanes disubstitués : isomérie cis-trans
Depending upon the different spatial orientation of the substituents, the disubstituted cycloalkanes exhibit two types of stereoisomers. The cis isomers ...
Énergie de combustion : mesure de la stabilité des alcanes et des cycloalcanes
Énergie de combustion : mesure de la stabilité des alcanes et des cycloalcanes
The low reactivity in alkanes can be attributed to the non-polar nature of C–C and C–H σ bonds. Alkanes, therefore, were  initially ...
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