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- Of the 4 atoms directly attached to the alkene in the major product, 3 of them are carbon and 1 is hydrogen. In the minor product, 2 carbon atoms and 2 hydrogen atoms are directly attached to the alkene.
www.masterorganicchemistry.com/2012/08/31/elimination-reactions-2-zaitsevs-rule/Elimination Reactions (2): The Zaitsev Rule – Master Organic ...
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Which atoms are directly attached to the alkene in elimination reactions?
Which atom is a in an elimination reaction?
Which elimination reaction gives the least substituted alkene product in the highest yield?
What atoms are bonded in elimination reactions?
Which carbon atom is bonded to the leaving group of alkyl halide?
Which haloalkane gives the most substituted (most stable) alkene product?
The most common elimination reactions are dehydrohalogenation and dehydration. In the mechanism above, X could be Cl, Br, or I for the dehydrohalogenation where there is a loss of HX from an alkyl halide. For dehydration, X would be an OH group in the above mechanism where the overall loss is water from an alcohol.
E2 elimination reactions in the laboratory are carried out with relatively strong bases, such as alkoxides (deprotonated alcohols, – OR). 2-Bromopropane will react with ethoxide, for example, to give propene.
When atoms are an \(sp^2\) hybrid they have a trigonal planar structure. These structures are very similar to a 'peace' sign, there is a central atom with three atoms around it, all on one plane. Trigonal planar molecules have an ideal bond angle of 120° on each side.
The two atoms directly connected to each alkene are compared. The atom with higher atomic number has higher priority. The position of the high priority groups are compared. If they are on the same side the compound is (Z) – otherwise it is (E).
In many elimination reactions that give alkenes, A (or B) is an H atom. In those cases we can represent the overall elimination reaction as we show below where we replace A by H, and B by the general leaving group symbol L. Figure 9.02. HH L. | | R2C CR2. HH L. fi R2C=CR2.
For an elimination reaction of alkyl halides, the major product alkene is produced together with the small HX (X is halogen) molecule, which is the side inorganic product. Such reaction with removal of a proton and a halide ion is called dehydrohalogenation.
