Reaction of the format preparation reagent and the keto
Grignard reagents were generally made by reacting an alkyi radical with metallic aluminum (usually fine wire or powder to increase the surface area) in absolute ether or in the presence of lithium ether (CHF). The preparation method was to slowly add the ether solution of a class of aromatic alcohol (commonly used class of aromatic alcohol or class of aromatic alcohol) into the mixture of the ether soaked in the ether. The speed of adding the ether should be able to maintain the ether boiling slightly until the mixture of the ether and the ether disappeared, and then the Grignard reagent was obtained. The reaction is an exhalation of heat. If the reaction is slow to start, a small particle of iodine-can be added to start it. Once the reaction begins, after the ether boils, the ether vapor is enough to eliminate the air in the system, but water is not allowed. Vinegar and the chorine bound to the ene carbon could not react with lithium in ether. If the ether was replaced by potassium ether, the reagent of lithium could be prepared. Grignard reagents could react with ketones. Under suitable reaction conditions, such as the Grignard reagent prepared by the researchers of Hokkaido University in Japan using ball mill technology, in the presence of a small amount of potassium furane (TH F) or cyclopentyl methylether (CPME), the prepared Grignard reagent reacted with an electrophile reagent such as a keto to construct a C-C bond to obtain the corresponding alcohol product. Read more exciting novels for free
Nessler's reagent preparation
There were two ways to prepare the Nessler's reagent: 1. Mercuric chloride-potassium iodine-potassium hydrogen solution: Weigh 15.0 g of potassium-potassium hydrogen solution, dissolve it in 50 ml of water, and cool it to room temperature. Weigh 5.0 g of potassium iodate (Ki) and dissolve it in 10 ml of water. Under stirring, add 2.50 g of mercury dioxide powder into the solution of potassium iodate several times until the solution becomes dark yellow or a light red deposit appears. When the solution is slowly dissolved, stir and mix thoroughly, and then add the saturated solution of mercury dioxide. When a small amount of vermillion deposit no longer melts, stop dripping. Under stirring, slowly add the cooled solution of potassium ether into the mixture of mercury dichloride and potassium iodate, and dilute it to 100ml. Let it stand in the dark for 24h, pour out the supernate, and store it in a polythene bottle. Cover it tightly with a rubber stopper or a polythene cap, and store it in the dark. It can be stable for one month. 2. Mercuric iodide-kalium iodide-soda solution: Weigh 16.0 g of soda ash, dissolve in 50 ml of water, and cool to room temperature. Weigh out 7.0 g of potassium-iodate (Ki) and 10.0 g of mercury-iodate (HgI <2>), dissolve them in water, and then slowly add this solution into the 50 ml of the above-mentioned solution of the sodium-oh solution while stirring, and dilute it to 100 ml with water. Store in a polythene bottle, tightly closed with a rubber stopper or a polythene cap, and store in a dark place. The shelf life is 1 year. Another preparation method was to weigh 60g of potassium hydrogen, dissolve it in about 250ml of aqua-free water, and cool it to room temperature. In addition, weigh 20g of potassium iodate and dissolve it in 100ml of aqua-free water. While stirring, gradually add mercury dicloride-crystallized powder (about 10g). When a vermilion deposit is difficult to dissolve, add a saturated mercury dicloride-solution drop by drop and keep stirring. When a small amount of vermilion deposit is difficult to dissolve, stop adding the saturated mercury dicloride-solution drop by drop. The solution was then slowly injected into the cooled solution of the above-mentioned solution of the potash, stirred thoroughly as it was injected, diluted to 400ml with an aqua-free solution, and then allowed to stand overnight. Finally, the solution was transferred to a plastic bottle and stored at room temperature in the dark. "Little Fox Fairy" is equally exciting. Everyone is welcome to click and read it!
Reaction of Tolens 'reagent with Formalin
Torrens 'reagent was a solution of silver, and its chemical formula was [(AgNH3) 2) Ox]. The reaction equation between Torrens reagent and Formalin is (HCHO +4(Ag(NH_3)_2)OH---(NH_4)_2CO_3 + 4Ag↓+ 6NH_3 +2H_2O\) The reaction would produce a silver mirror phenomenon. This was because the formalin had a reducing property. During the reaction, the formalin was oxided, and the silver ions in the Torrens reagent were reduced to silver, which was deposited on the wall of the glass reaction vessel to form a silver mirror. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The value of the reaction rate of the reagent
The value of the rate of an alcoholic reaction is usually expressed by the increase in the concentration of the product in a unit of time (it can also be expressed by the decrease in the concentration of the substance in a unit of time, but it is generally not used because it is not easy to measure), that is, v = dt (the concentration of change/the corresponding time of the reaction). The unit of concentration is usually in the form of mole/liter, mole/liter, mole/milliliter, or mole/milliliter, and the unit of time is in the form of seconds or minutes. However, the rate of the fermentation reaction was affected by many factors, such as temperature, concentration of the reagent, concentration of the reagent, and so on. The value would vary greatly under different conditions, and there was no fixed specific value. In the optimal temperature range, when other conditions remained unchanged, the reaction rate increased with the increase of temperature, and the fastest reaction rate was reached when the optimal temperature was reached. Under the condition of sufficient substances, the higher the concentration of the catalyst, the faster the reaction rate. Within a certain range of the concentration of the substances, the reaction rate increased with the increase of the concentration of the catalyst, and the reaction rate reached the fastest and no longer changed when the concentration reached the optimal concentration. The reaction rate would be reduced by the initiator, and the reaction rate would be accelerated by the initiator. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
A product of the reaction of alcohol with a Grignard reagent.
The alcohol reacted with the Grignard reagent to give the alkyls and the alkoxypidium. The reaction formula is RMengX + ROH → RHmX + ROMengX, where RMengX is a Grignard reagent, R is an fatty or aromatic radical, and X is a halo (Cl-I, Br-I). <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Reaction of Fehling's reagent with an aldo
The reaction between Fehling's reagent and an aldo will produce a brick-red copper dioxide (Cu2 O). During the reaction, the color of the solution may gradually change from blue to green to yellow to red. If the reaction is fast, the red deposit can be directly observed. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Rearrangement reaction, amount of reagent used
Different rearrangements required different amounts of the catalyst. For example, in the synthesis reaction of erythromyrin A{E}}, the amount of alcohol used was 1ml/1 g of erythromyrin A thianate; in the liquid-phase rearranged reaction of 2,102 epoxipinane, the amount of the catalyst used would affect the rearranged reaction, but the specific amount was not specified; in the use of the Curtius rearranged reaction, the amount of the catalyst used was not specified; in the Hofmann rearranged reaction, when water was used as the catalyst, the amount of water was not specified. Therefore, the amount of the rearranged reaction's reagent used varied according to the specific type of the rearranged reaction. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The reaction of the name of the organic zincate reagent
The name of the reaction related to the organic zincate reagent was the Reformasky reaction (Reformaskii reaction), which was a reaction in which an organic zincate reagent prepared from an alpha halo ester and a titanium powder carried out a nuclopathic addition reaction on a carbonyl-based compound (aldo, keto, ester) to form a beta-hy-droxy ester. There was also the Fukuyama (Fukuyama) couple reaction, which referred to the reaction of an organic zincate compound and a thionate ester to form a keto under a palladium-based catalyst. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Reaction conditions of protein and biuret reagent
The reaction condition of the protein and biuret reagent was room temperature (no heating was needed). During the reaction, solution A (0.1 g/mL of either lithium or potassium) was added first, followed by solution B (0.01 g/mL of copper sulphate), and the reaction needed to be carried out in an acidic environment. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The Reaction Rate of the Reaction of Keto and Bihydrogen Sulphite
In the addition reaction of the carbonyl-like group of the acid, the reaction rate was different. Propional reacted the fastest with bisulfuric acid, followed by Cyclohexuron, methylethyluron, and dibenzone. Among the alkahedes, the reaction rate of the addition of formalin to the nucleus was the fastest. Because the hydrogen atom attached to the carbonyl-group was the smallest, the steric hindrance was the smallest, so the reaction was the fastest. Aldes, fatty methyls, and cycloketones with less than eight carbon atoms could undergo an addition reaction with saturated water-based bisulphite solution (about 40%). The reaction rate of different alkyls and methyls was different, which was related to the atoms or groups connected to the carbonyls. The smaller the steric hindrance caused by the atoms or groups, the faster the reaction rate. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Biuret reagent test protein reaction conclusion
When the biuret reagent was used to detect protein, when the base contained a peptidic bond (a peptidic bond), the copper in the test solution would coordinate with the peptidic bond, and the complex would turn purple. The color of the purple complex produced by the reaction was directly proportional to the concentration of the protein, and it had nothing to do with the molecular weight of the protein and the composition of the protein. The concentration could be analyzed by a prismatic method, and the wave-length in the ultraviolet-visible spectrum was 540mn. The sensitivity of the identification reaction was 5 - 160g/ml, and the identification reaction protein unit was 1 - 10g. Moreover, the compound molecules that could produce a purple reaction with the biuret reagent contained at least two peptidic bonds, so dipeptides could not be tested with it. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>