Kodi formic acid imapereka mayeso a 2/4 DNP?
Kodi formic acid imapereka mayeso a 2/4 DNP?
Anonim

Ndi za ndi chifukwa chomwecho inu akhozaOsapanga ma amides kuchokera ku carboxylic asidi ndi amine: ndi amine deprotonate asidi. The carboxylate anion ndi resonance-stabilized ndi ndi carbonyl mpweya ndi electrophilic insufficiently. Chifukwa chake, formic acid adzakhala ayi pa 2,4 - Kuyesa kwa DNP.

Momwemonso wina angafunse, ndi ma reagents ati omwe angasokoneze mayeso a 2 4 Dnph?

Aldehydes ndipo ma ketoni amachitira ndi 2, 4-dinitrophenylhydrazine reagent kuti apange mpweya wachikasu, lalanje, kapena wofiira-lalanje, pamene mowa sumachita. Kupangidwa kwa mpweya kumasonyeza kukhalapo kwa aldehyde kapena ketone. The precipitate from this test also serve as a strong derivative.

Momwemonso, zikutanthawuza chiyani ngati mpweya wopangidwa mu 2 4 DNP mayeso ndi wachikasu? Brady ndi mayeso 2, 4-Dinitrophenylhydrazine akhoza kugwiritsidwa ntchito kuti azindikire momwe carbonyl imagwirira ntchito pagulu la ketone kapena aldehyde. Ngati carbonyl pawiri ndi onunkhira, ndiye kufuna kukhala wofiira; ngati aliphatic, ndiye kufuna kukhala ndi zambiri yellow mtundu.

Pambuyo pake, wina angafunsenso, kodi carboxylic acid imapereka mayeso a 2/4 DNP?

2, 4-DNPH ndi osachita ndi ma amides, esters kapena carboxylic acid. Monga momwe zilili pansipa kwa ndi mlandu wa ester, mawonekedwe owonjezera a resonance akhoza kujambulidwa pamitundu itatu iyi yamankhwala poyerekeza ndi ketone.

Kodi mayeso a 2 4 Dinitrophenylhydrazine 2 4 DNP angasiyanitse pakati pa aldehydes ndi ketoni?

Ku mayeso kwa a aldehyde kapena ketone inu angatero ntchito 2, 4-Dinitrophenylhydrazine (2, 4-DNP). 2, 4-DNP Wosakaniza ndi methanol ndi sulfuric acid amadziwika kuti ndi Brady's reagent. Ngati siliva imvi olimba kapena galasi ngati zotsatira apangidwa, ndi aldehyde alipo. Ngati a ketone alipo, apo adzatero osachitapo kanthu.

Yotchuka ndi mutu