2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Cov tshuaj tiv thaiv Schmidt yog cov tshuaj tiv thaiv organic uas an azide reacts nrog carbonyl derivative, feem ntau yog ib qho aldehyde, ketone, los yog carboxylic acid, nyob rau hauv acidic tej yam kev mob los muab ib tug amine los yog amide, nrog tshem tawm ntawm nitrogen.
Schmidt kev hloov kho yog dab tsi?
Cov tshuaj tiv thaiv Schmidt xa mus rau acid-catalyzed cov tshuaj tiv thaiv ntawm hydrazoic acid nrog electrophiles, xws li carbonyl compounds, tertiary alcohols thiab alkenes. Cov substrates no tau kho dua tshiab thiab extrusion ntawm nitrogen los muab amines, nitriles, amides lossis imines.
Qhov nruab nrab twg yog tsim los ntawm Schmidt rov kho cov tshuaj tiv thaiv?
Ib qho nruab nrab hauv Schmidt rearrangement tau pom tias yog an acyl azide, thiab qhov nruab nrab isocyanate feem ntau tsis cais raws li cov xwm txheej no.
Tus reagent twg yog siv rau Schmidt cov tshuaj tiv thaiv?
Cov tshuaj tiv thaiv Schmidt [1] yog cov tshuaj tiv thaiv organic cuam tshuam nrog alkyl / aryl tsiv teb tsaws hla cov pa roj carbon-nitrogen hauv azide nrog kev tshem tawm cov nitrogen. Ib qho tseem ceeb reagent qhia cov pab pawg azide no yog hydrazoic acid, thiab cov khoom siv tshuaj tiv thaiv nyob ntawm qhov xwm txheej ntawm substrate.
Qhov twg yog Curtius rov kho cov tshuaj tiv thaiv?
Lub Curtius rearrangement yog ntau yam tshuaj tiv thaiv uas a carboxylic acid tuaj yeem hloov mus rau ib qho isocyanate los ntawm acyl azide intermediate nyob rau hauv cov mob me. Qhov tshwm sim ruaj khov isocyanate tuaj yeem hloov pauv mus rau hauv ib qhoNtau yam ntawm amines thiab amine derivatives suav nrog urethanes thiab ureas.
Pom zoo:
Cov tshuaj tiv thaiv dab tsi rau kev txhaj tshuaj tiv thaiv thib ob?
Cov tshuaj tiv thaiv COVID-19 thib ob yog dab tsi? Cov kev mob tshwm sim feem ntau tom qab koob thib ob yog qhov mob ntawm qhov chaw txhaj tshuaj (92.1% tshaj tawm tias nws kav ntev dua 2 teev); qaug zog (66.4%); mob lub cev lossis leeg nqaij (64.
Puas yog lub cev tiv thaiv kab mob hauv lub cev puas tsim cov tshuaj tiv thaiv?
Lub cev tiv thaiv kab mob tau txais, nrog kev pab los ntawm lub cev hauv lub cev, tsim cov hlwb (tshuaj tiv thaiv kab mob) los tiv thaiv koj lub cev los ntawm ib tus neeg invader tshwj xeeb. Cov tshuaj tiv thaiv no yog tsim los ntawm cov hlwb hu ua B lymphocytes tom qab lub cev tau raug rau cov neeg ua phem.
Vim li cas cov tshuaj tiv thaiv combustion yog cov tshuaj tiv thaiv oxidation?
Kev sib xyaw ua ke ib txwm ua rau muaj oxygen lossis huab cua. … Hauv combustion cov tshuaj tiv thaiv oxygen yog ua ke nrog cov roj qhov chaw feem ntau carbon thiab hydrogen raws li ua rau carbon dioxide thiab dej thiab yog li qhov no yog cov tshuaj tiv thaiv oxidation.
Cov tshuaj twg yog cov tshuaj uas tsis yog tshuaj tiv thaiv inflammatory analgesic?
Txhua yam koj yuav tsum paub txog NSAIDs. Nonsteroidal anti-inflammatory tshuaj (NSAIDs) yog cov tshuaj uas txo qis lossis txo qhov mob. Cov piv txwv nrov tshaj plaws ntawm cov tshuaj hauv pawg no yog aspirin thiab ibuprofen. NSAIDs tuaj nyob rau hauv lub ntsiab lus dav ntawm non-opioid analgesics.
Yuav ua li cas cov tshuaj tiv thaiv coagulants tiv thaiv cov ntshav txhaws?
Anticoagulants tseem hu ua ntshav thinners yog cov tshuaj uas siv los kho thiab tiv thaiv cov ntshav txhaws. Lawv cuam tshuam cov txheej txheem kev koom tes hauv kev tsim cov ntshav txhaws thiab ua haujlwm los ntawm kev tsom mus rau cov ntshav txhawsyam xws li thrombin, fibrin, thiab vitamin K.
