Kokk on läinud valesti

Z420505

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Nii et mul oli üks ettevõte mõni aeg tagasi saatis mulle 5clad-komplekti, kuid 5bromopenteeni asemel kasutasid nad fluropenteeni ja igatahes tuli see nõrk ja atsetoonis lagunedes muutub see lihtsalt kõik valgeks. Nii et minu ideaal oli tellida 5bromo ja rohkem dmf ja uuesti keeta ja loodetavasti tuleb parem välja. Mõtteid?
 

WillD

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Ma arvan, et probleem on midagi muud. Fluoritud versioon ei tohiks olla probleemiks.
 

HerrHaber

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Minu ausa arvamuse kohaselt olen üllatunud, et see üldse töötas, ja kuigi terminaalne fluori aatom on teadaolevalt selles kontekstis toimiv Bromiid võib vähemalt olla (hea) lahkuv rühm, kuid fluoriid ei ole kunagi C-F sideme tugevuse tõttu. Kaksikside on reaktiivne teistsugustes tingimustes, seega ei saa see olla parim reaktsioonikoht. Tehke väike partii 5-Bromo-1-penteeniga ja vaadake, kas toode muutub paremaks... valgeks muutumine kokkupuutel atsetooniga näitab selgelt, et toode on erinev, kuid teie optimistlikus vaates võin ma seda nimetada ebatäielikuks, mistõttu "saba" puudub, nagu teie kirjeldatud ja seletab suurt tugevuse langust. Kvaliteedi tõenäolisemaks parandamiseks peaksite kasutama kas 5-bromo-1-pentaani või 1-bromo-5-pentaani. Ma ei ole ekspert selles täpses valdkonnas, kuid keemia on minu jaoks mõnevõrra mõistlik, kuna minu arvates on ka ebatavaline, et inimesed kirjeldavad oma preparatiivseid eksimusi sellisel pöördelisel viisil. Ma arvan, et te lõpetate kas parema kui see on potentsi või ei ole märkimisväärset muutust juhul, kus ma soovitan mitte müüa seda, kuna probleem on kaugel lahendatud.
 

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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