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Z420505

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Takže pred časom mi jedna spoločnosť poslala súpravu 5clad, ale namiesto 5bromopenténu použili fluropentén a aj tak to vyšlo slabé a pri rozklade v acetóne to celé len zbelelo. Takže môj ideál bol objednať 5bromo a viac dmf a prevariť a dúfam, že to vyjde lepšie. Čo si o tom myslíte?
 

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Myslím si, že problém je v niečom inom. Fluorizovaná verzia by nemala byť problémom.
 

HerrHaber

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Podľa môjho úprimného názoru som prekvapený, že to vôbec fungovalo, a zatiaľ čo terminálny atóm fluóru je známy v tomto kontexte, bromid aspoň môže byť (dobrou) odchádzajúcou skupinou, ale fluorid nikdy nie, kvôli pevnosti väzby C-F. Dvojná väzba je reaktívna za iných podmienok, preto nemôže byť najlepším miestom reakcie. Urobte malú dávku s 5-Bromo-1-penténom a uvidíte, či sa produkt zlepší... Zbeľovanie pri kontakte s acetónom jasne naznačuje, že produkt je iný, ale vo vašom optimistickom pohľade ho môžem nazvať neúplným, preto chýba "chvost", ako naznačuje to, čo opisujete, a vysvetľuje veľký pokles účinnosti. Pre pravdepodobnejšie zlepšenie kvality by ste mali použiť buď 5-bróm-1-pentén, alebo 1-bróm-5-pentán. Nie som odborník presne v tejto oblasti, ale chémia mi dáva určitý zmysel, pretože sa mi tiež zdá nezvyčajné, aby ľudia opisovali svoje prípravné chyby takýmto reverzibilným spôsobom. Myslím si, že skončíte buď s lepšou potenciou, ako je, alebo bez výraznejšej zmeny prípadu, v ktorom odporúčam nepredávať, pretože problém nie je ani zďaleka vyriešený.
 

Z420505

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It worked, the batch after recooking turned right color in solvent. Also, had a very good affect. Had a white residue at bottom but I’m going to say that was a bonding problem with first cook. 5-bromo should not be substituted with fluropentane. It’s just weak and create a different chemical that what attendended.
 

HerrHaber

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if Fuoride was substituted as Bromide was intended to, you deserve some place in a decent journal publish about it. Instead the double bond reacted (most likely), which is also great for you and the anticipated product can't be else than potent by S.A.R. be careful with the side products though, (more potent is not necessarily more pure or safe). Cheers!
 

Z420505

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A lot of these Chinese companies just send whatever, most are just selling without knowing exactly what they are selling. Look at the ingredients list and discovered an error in list prior to previous orders.
 

HerrHaber

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Like one of those shops with a big advert saying "translate server error" instead the name of the shop in English
 

HerrHaber

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I accidentally treated this as a joke when in fact it isn't that much to laugh about when knowing details of how some work as I tend not to perform any tests on my regular known materials unless something seems wrong to me.
 
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