1-Fenil-2-propanona (P2P) aminação de Leuckart a anfetamina e metanfetamina. Escala de Smale.

Selassi

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O Swim recebeu uma pergunta sobre uma variação diferente deste método:

Após o primeiro passo (ebulição com fórmico e formamida), voltam a ferver a fase orgânica com água e NaOH em vez do refluxo com HCl.

Alguém me pode explicar a métrica deste segundo passo diferente? A Swim nunca o fez desta forma, mas parece poupar muito tempo em comparação com o método antigo com HCl em refluxo.

Qual a concentração de soda cáustica/água e qual a quantidade introduzida no reator por L de produto?
Durante quanto tempo se deve ferver esta mistura de reação e a que temperatura?
 

Curiousonion

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Porquê um rendimento tão baixo para isto, alguém tem um método de rendimento mais elevado para a metanfetamina?
 

Saul

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isso não está certo informação errada esse tipo de tese comete grandes erros

o carbonato de amónio nunca é utilizado diretamente com o p2p.
Primeiro, é feito o formato de amónio.
O formato de amónio é facilmente obtido através do carbonato de amónio e do ácido fórmico. Titular
para um bom pH de 7 e remover a água.
Só então pode ser utilizado com o p2p
 

waltjr5858

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Yes ammonium carbonate can completely be used in this reaction directly it's actually a very popular method in many countries and makes ammonium formate in situ.... if you're not 100% sure what you're saying on here don't
 

G.Patton

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Utiliza o condensador de refluxo e a hotte de exaustão?
 

waltjr5858

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In a write up that most people are reading to do this leuckart with formamide and p2p specifically... what is the purpose of a 15 min reflux with 30% h2O2 with the reaction mixture after you have already done the first reflux with formamide and p2p. Does it clean up or oxidize something? I mean this is prior to the hydrolysis. I just can't think of what it would do. I mean most people do it without it but it was obviously added for a reason in a actual professional write-up.
 
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G.Patton

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Sorry, but I don't clearly understand about what "15 mix reflux" are you talking about? Can you be more precise. Refer to a step number.
 

waltjr5858

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It's not on these instructions. When making amphetamine after the first 24 hour reflux on a different set of instructions they would reflux for 15 minutes with 30% hydrogen peroxide and then go on with hydrolysis. What was the point of the peroxide?
 

G.Patton

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I have no Idea about what "different set of instructions" are you talking and hence can't answer your question.
 

waltjr5858

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Ok... but in general then what would happen to the resulting solution if spun up with 30% peroxide?
 

William Dampier

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A utilização de uma quantidade adicional de água na reação de Leuckart pode aumentar o rendimento. Quem o fez, pode escrever sobre isso aqui.
 

TheNut22

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Sim. Em Leuckart, temos de nos certificar de que não há água.
 

southcost

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But we have a 12% water at least in our formic acid, isn't it?
 

TheNut22

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Eu fiz os meus peróxidos de hidrogénio mais fortes a partir de H2O2 a 12%. Evaporei cuidadosamente a água.
Pedi cálculos à IA-robô assistente em química. É bom em cálculos, mas não esperes obter respostas correctas
de halogenações ou similares ...
 
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loadingST

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Ainda não experimentei a reação, mas com uma boa hidrólise com KOH e depois com HCL deve dar um rendimento elevado, e receio que trabalhando com h2o2 não se formem peróxidos explosivos e que, após a destilação, não explodam
 

YenaneY

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This questions are mainly regarding the actual chemistry behind the synthesis...
Why does one for the formation of the amine from the intermediate need H2O2 and HCl in the synthesis of amphetamine but only HCl in the synthesis of methamphetamine?
 

waltjr5858

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I saw the same thing and nobody has an answer for it but it was done by actual professional chemist.... not clandestine hackers so id say its there for a reason but it will work without it. Probably to kill off so.e kind of side product or something.
 

YenaneY

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I think it really is because the hydrogen peroxide helps promote the reaction, but the reaction of deformylation is generally easier on tertiary amines compared with secondary ones, which is why it happens more readily if N-methylformamide is used for methamphetamine.
 

Pinkbay

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sir, In step 3, is heating required?
 

rampage

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can you replace n-methylformamide with dimethylformamide?
 
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