mannich reaction वाक्य
उदाहरण वाक्य
मोबाइल
- The Mannich reaction is also considered a condensation reaction.
- Mannich reaction with dimethylamine and formaldehyde was described.
- Overman has also worked extensively on the aza-Cope-Mannich reaction, originally designed
- A related reaction is the Mannich reaction.
- Like the Mannich reaction, aldehydes give good yields while ketones tend to give lower conversion.
- This is suitable for cleaving glycols and alpha-hydroxy ketones in ring opening and Mannich reaction.
- In the Mannich reaction, primary or secondary amines or ammonia, are employed for the activation of formaldehyde.
- Gramine, a useful synthetic intermediate, is produced via a Mannich reaction of indole with dimethylamine and formaldehyde.
- Additional reactions include aldol reactions, Mannich reaction, Michael reaction, amination, ?-oxyamination, and ?-halogenation.
- The Mannich reaction is an example of nucleophilic addition of an amine to a carbonyl group followed by dehydration to the Schiff base.
- This process occurs through an oxidation, which regenerates the pyrrolinium cation and formation of an enolate anion, and an intramolecular Mannich reaction.
- The compound is formed by reaction of ethylene urea with a 37 % solution of formalin and hydrochloric acid in a sequence of Mannich reactions.
- Biosynthesis of monoterpenoid indole alkaloids begins with the Mannich reaction of tryptamine and secologanin; it yields strictosidine which is converted to 4, 21-dehydrogeissoschizine.
- Imines synthesized in this fashion have been shown to undergo a one-pot Mannich reaction with 1, 3-dicarbonyl compounds, such as protected imine.
- To obtain the primary thia-?-Ala-OMe intermediate, a sequence of condensation, Mannich reaction, and palladium-catalyzed decarboxylation steps were performed.
- Chloroiodomethane is used in cyclopropanation ( " Simmon-Smith reaction " ), Mannich reaction, aminomethylation, epoxidation, ring opening and addition to terminal alkenes.
- The two reactants ( imine and enamine ) line up for the Mannich reaction with Si facial attack of the imine by the Si-face of the enamine-aldehyde.
- A reverse Pictet-Spengler reaction cleaves the C2 C3 bond, while a subsequent Mannich reaction forms the C3 C7 bond, and a Michael addition forms the C2 C16 bond to provide dehydropreakuammicine.
- The aza-Cope / Mannich reaction shows high diastereoselectivity, generally in accordance the results of allyl and amine substituents are installed on a ring, and thus cis or trans to one another.
- "' Acrylophenone "'is an organic compound with the formula C 9 H 8 O . It is prepared using acetophenone, formaldehyde, and an amine hydrochloride in a Mannich reaction.
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