The mechanism of the substitution reaction is
There were two mechanisms for the substitution reaction: 1. ** Bimoleral Nucleic Substitution Reaction (Sn2)**: - This was a bimoleral reaction, and the reaction rate depended on the concentration of the halon and the concentration of the nuclophile. - The reaction was completed in one step. During the reaction process, the central carbon atom of the cleaved carbon dioxide was attacked by the nuclophile and left by the leaving group at the same time, and it would go through a transition state. In the transition state, the nuclophile and the cleaved carbon dioxide were connected by a partial bond, and the leaving group and the cleaved carbon dioxide were also connected by a partial bond. - The reaction process was accompanied by a transformation of the configuration, known as the Walden transformation, which was an important sign of the Sn2 reaction. For example, R - 2 -Bromobutan would be converted to S - 2 -Butanol when 2 -Bromobutan was being digested. 2. ** Unimoleral Nucleophile Substitution Reaction (sn1)**: - The reaction was carried out in two steps. The first step was to undergo a slow reaction of heterocracking of the aromatic compounds to form the active intermediate carbon ions. This step was the step that determined the reaction rate. The second step was to combine the carbon ions with the nuclophile to form a product. - The product was racemized. Read more exciting novels for free
The mechanism of the cycloaddition reaction
The cycloaddition reaction was a bimoleral reaction in which the carbon atoms of the end groups of two molecules in a Conjugated System joined together to form a ring. For the cycloaddition reaction, from the perspective of the molecular orbital symmetries conservation principle, when the sum of the number of carbon atoms in the two reaction molecules was an integral multiple of four, the thermochemical reaction was mainly carried out in the same face-different face or different face-same face mode, and the photochemical reaction was mainly carried out in the same face-same face or different face-different face mode. When the sum of the number of carbon atoms in the two reaction molecules is an even number other than four, the thermochemical reaction is mainly carried out in the same face-same face or different face-different face mode, and the biochemical reaction is mainly carried out in the same face-different face or different face-same face mode. The frontier orbital (FMO) theory believed that in a bimoleral photoreaction, both components were excited molecules with two single electrons. The Mo occupied by a single electron was also called SOMO. The cycloaddition method under illumination was: The two SOMOs with higher energy of the two components combined to form a single bond. However, this was only a part of the general bimoleral photoreaction. It was related to the cycloaddition reaction. The specific reaction mechanism was more complicated and different reagent systems might be different. Fantasy Realm is equally exciting. Everyone is welcome to click and read it!
mechanism of the cycloaddition reaction
The cycloaddition reaction was a bimoleral reaction in which the carbon atoms of the end groups of two molecules in a Conjugated System joined together to form a ring. When forming a sigma-bond in the cycloaddition reaction, the carbon atoms of each pair of end groups could be in the same or different faces. If the polyene reagent has a substitution, then the product molecules may have different, recognizable structural characteristics. According to the principle of conservation of molecular orbit, the main way of cycloaddition reaction could be determined: when the sum of the number of carbon atoms in the two reaction molecules was an integral multiple of four, the thermochemical reaction was mainly carried out in the same face-different face or different face-same face way, and the photochemical reaction was mainly carried out in the same face-same face or different face-different face way. When the sum of the number of carbon atoms in the two reaction molecules is an even number that is not an integral multiple of four, the thermochemical reaction is mainly carried out in the same face-same face or different face-different face manner, and the biochemical reaction is mainly carried out in the same face-different face or different face-same face manner. For example, the sum of the number of carbon atoms in the Diels-Alder reaction was 6, which was an even number that was not an integral multiple of four. The thermochemical reaction was mainly carried out in the same face-same face or different face-different face manner. In addition, taking the "cycloaddition/ring-opening" reaction of bicyclo [1.1.0] butanes (BCPs) and triazinane reported by Peng Shiyong's research group of Wuyi University as an example, the cycloaddition followed a step-by-step (3 + 2 + 2) instead of (4 + 3) cycloaddition. It involved the SSN2-like addition of formaldimine and Lewis acid activated BCPs. The possible mechanism was: first, B(C6F5)3 activated 2a to form complex I; then, formaldimine (formed in place from triazinane 1a) and I carried out a N-like addition to form intermediate II; then, it reacted with another formaldimine to form intermediate III; finally, the molecular cycle released the B(C6F5)3 catalyst to form product 3a. Fantasy Realm is equally exciting. Everyone is welcome to click and read it!
Diels Alder reaction mechanism
The reaction mechanism of the Diels-Alder reaction was generally considered to be a cycloidal reaction through a circular transition state. During the reaction, the two reagents were close to each other and interacted with each other to form a ring-shaped transition state, and then gradually transformed into product molecules. That is, the breaking of the old bond and the formation of the new bond were coordinated and completed in the same step. There was no intermediate formation. From the perspective of orbital theory, when a dienophile with an electron donating group and a dienophile with an electron withdrawing group were reacting, the smaller the energy difference between the frontier orbitals (the HOMO of the diene and the LUMO of the dienophile), the more stable the interaction between the orbitals was, thus making the reaction easier to carry out (electron demanding type). Similarly, the reaction between a dienophile with an electron donating group and a dienophile with an electron withdrawing group was also easier to carry out (anti-electron demanding type). The reaction was carried out according to the cis-addition of the cooperative reaction, and the endo addition product was generated first (endo rule). However, in the Diels-Alder reaction, although the second-order orbital interaction could roughly explain this rule, the endo/exo selectively generated exo products were also affected by the size. In addition, the Diels-Alder reaction within the molecules was not completely applicable to the endo rule due to the fixed ring structure and the low degree of freedom of the configuration. According to the theory of organic electrons, the addition product of the Diels-Alder reaction was more likely to place the substitution group in the ortho-or para-position (ortho-and para-rules). The details could be explained by the frontier orbital theory, that is, the reaction points with large HOMO-LUMO coefficient were easy to overlap and add. The cyclo-transition state of the diene could be added when the s-cisoid structure, but the s-transoid structure could not undergo the Diels-Alder reaction. Fantasy Realm is equally exciting. Everyone is welcome to click and read it!
The mechanism of the browning reaction of Ascorbic acid
The mechanism of the inhibition of the browning of the body by the ester was that it was both an organic acid and a reducing agent. It could reduce the oxided Quinones to the vitamins and prevent the Quinones from further spontaneously agglomerating to form a coloring substance, thereby suppressing the activity of the Polygala Oxidases (PPO). It could also reduce the oxygen content to suppress the browning reaction. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The reaction between ethene and alcohol is a substitution reaction
The reaction between ethene and ethanoi was an electropathic addition reaction, not a substitution reaction. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Substitution Reaction of Sodium-ethanate
The reaction between alcohol and Na was a substitution reaction, and the reaction equation was C Chi H Oh + 2Na -> C Chi H ONa + Chi H. In this reaction, the alcohol was replaced by a hydrogen atom, forming a mixture of hydrogen and ethanate. It could be used as a reducing agent, a catalyst, and a catalyst. It could also be used to prepare other compounds such as acetate-ether and acetate-ether. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Explain the substitution reaction of alkyls
The substitution reaction of alkyls had the following phenomena and characteristics: 1. ** Reaction conditions ** - Requires light (no reaction in the dark at room temperature, but direct light cannot be used, otherwise it will explode). 2. ** Reactants ** - The reagent was a pure elemental gas, such as a gaseous mixture of sulfur and hydrogen. 3. ** Reaction progress ** - The reaction wouldn't stop at a single step. It would proceed step by step, and the final product would be a mixture of many substances. For example, if one hydrogen atom (1 mole of H) was replaced, one mole of Cl2 was needed. It was wrong to think that one Cl2 could replace two H atoms. For example, in the substitution reaction of methane, the atoms in the Cl3 could "seize" a hydrogen atom in the methane, and then compensate a Cl3 atom to the methane to form methachloromethanes. The reaction would continue, gradually forming various products such as methylethylane, methylethylane, and methachloromethanes. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Reaction mechanism of alcohol and aluminum trioxid under heating
When alcohol was dehydrated into ene, aluminum dioxide was used as a dehydration agent. The alcohol molecules were absorbed on the surface of aluminum dioxide and then dehydrated. The water removed formed aluminum dioxide with aluminum dioxide. This was different from the mechanism of concentrated sulfuric acid protonating the alcohol's hydrogen and then removing water to form carbon ions. However, he did not find out more about the reaction mechanism of the heating reaction of alcohol and aluminum dioxide, so he could not answer accurately. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Substitution Reaction of Butane and Bromine Steam
Butane and Bromine vapor would undergo a substitution reaction under light conditions. During the reaction, the hydrogen atoms in the Butane molecules would gradually be replaced by Bromine atoms, forming a variety of Bromobutane products. For example, n-Butane produced various kinds of chloride-Butane through free radical substitution reaction. The reaction between Butane and Bromine vapor was similar. During the reaction, similar free radical would participate in the reaction, gradually forming products such as monobromobutane and producing Brr. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Alkane substitution reaction consumes the most Cl2
In the substitution reaction between an alkyls and a hydrogen atom, one hydrogen atom could only be replaced by one hydrogen atom. To maximize the consumption of Cl2, all the hydrogen atoms in the alkyls were replaced by Cl2 atoms. According to the general formula of alkyls, the larger the number of hydrogen atoms, the more hydrogen atoms there were, and the more Cl2 would be consumed during the complete substitution. Theoretically, alkyls with infinite carbon number would consume the most Cl2 during the complete substitution reaction, but there was no specific alkyls with the largest number of hydrogen atoms. As long as the carbon number continued to increase, the amount of Cl2 consumed would continue to increase. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>