What is endo and exo in chemistry?
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What is endo and exo in chemistry?
In the endo drawn below, the “outside” group on the diene (the hydrogens) points down, and the bond to the carbonyls on the dienophile point down as well. Same side of the new ring. In the exo the outside group (hydrogen) is down and the bond to the electron-withdrawing group points up.
What is endo and exo in Diels Alder reaction?
When two cyclic structures combine in a Diels Alder reaction, a third ring is formed in between the original ones. There are different ways the two original rings can combine, leading to different stereochemical outcomes. These two outcomes are called “exo” and “endo” addition.
Is Diels-Alder endo or exo?
Long story short: the Diels-Alder is another example of a reaction that can be run under kinetic or thermodynamic control, where the “endo” is the kinetic product and the “exo” is the thermodynamic product. ]
How do we know if a reaction is endothermic or exothermic?
So if the sum of the enthalpies of the reactants is greater than the products, the reaction will be exothermic. If the products side has a larger enthalpy, the reaction is endothermic.
Why is endo product formed?
The endo product is kinetically favored, which means that under conditions of low temperature and limited time, it will be the major product that is formed. This is because the transition state of the formation of the endo product is lower in energy due to overlap of secondary orbitals.
Why does Diels-Alder favor endo?
How do you know if a reaction is exothermic or endothermic without enthalpy?
Which event is an example of an exothermic reaction?
Difference between Exothermic and Endothermic Reactions
| Exothermic Reaction | Endothermic Reaction |
|---|---|
| Examples include rusting iron, settling, chemical bonds, explosions, and nuclear fission. | Examples include ice melting, evaporation, cooking, gas molecules, and photosynthesis. |
