2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
-NH2 pawg hauv aniline yog o thiab p- directing nyob rau hauv cov xwm raws li nws nce electron ceev ntawm o- thiab p- txoj hauj lwm vim resonance.
Vim li cas NH2 pawg hauv aniline yog ortho thiab para directing ntawm electrophilic aromatic hloov?
NH2 pab pawg hauv aniline yog ortho thiab para guiding pawg vim vim muaj suab nrov, lawv yuav tso cov hluav taws xob rau lub nplhaib thiab tib lub sijhawm tshem tawm cov electrons ntawm lawv tus kheej vim +1 cuam tshuam los ntawm lub nplhaib aromatic. … Tus hloov pauv yog hu ua pawg tswj hwm meta yog tias pom qhov tsis sib xws.
Puas yog NH2 pawg meta directing?
Nyob rau hauv NH2 cov nitrogen txuas rau lub nplhaib benzene muaj ntau tshaj ntawm electron li no nws yog + R directing pawg. Thaum nyob rau hauv NO2 cov nitrogen txuas rau lub nplhaib benzene tsis muaj ib khub ntawm electrons ntxiv li nws yog -R effecting pab pawg uas yog meta directing.
Vim li cas NH2 yog ortho thiab directing group?
Yog li, pawg amino xws li −NH2 tam sim no hauv aniline yog ib pawg muaj zog ua kom muaj zog thiab yog ortho thiab para directing vim rau nws muaj zog +R nyhuv. … Vim hais tias ntawm no, muaj zog acidic tej yam kev mob raug siv vim hais tias ib co ntawm cov aniline molecules tau protonated rau anilinium ion.
Yuav ua li cas thiaj li muaj txiaj ntsig ntawm NH2 pawg hauv aniline tswj tau?
Teb: Cov txiaj ntsig ntawm -NH 2 pab pawg tuaj yeem tswj hwm los ntawm tiv thaiv -NH2 pab pawg los ntawm acetylation nrogacetic anhydride, thiab tom qab ntawd ua tiav qhov kev hloov pauv uas xav tau ua raws li hydrolysis ntawm cov hloov pauv amide mus rau qhov hloov pauv amine.
Pom zoo:
Thaum lub sijhawm nitration ntawm aniline cov amino pawg tiv thaiv los ntawm?
Cov nyom rau nitration ntawm aniline tau kov yeej los ntawm kev tiv thaiv ntawm cov amino pawg los ntawm acetylation. Cov acetyl pawg txo cov reactivity ntawm lub nplhaib thiab yog li nws oxidation tsis tshwm sim yooj yim nrog nitric acid HNO3.
Nyob hauv ib pab pawg abelian txhua pawg sub yog?
Txhua pab pawg ntawm pawg neeg abelian yog ib txwm, yog li txhua pab pawg ua rau nce mus rau ib pawg neeg. Subgroups, quotients, thiab ncaj qha sums ntawm abelian pawg yog dua abelian. Cov pab pawg abelian yooj yim kawg nkaus yog cov pab pawg cyclic ntawm kev txiav txim thawj zaug.
Puas pab pawg pab pawg txhawb nqa pawg?
khoom plig stacks txhua lub sijhawm. Tam sim no, thaum koj qhib MyPlayer nav, nco ntsoov xyuas nrog koj cov xwm txheej. Feem ntau koj tsis tas yuav ua dab tsi kom tau txais koj VC los ntawm lawv, tab sis nws yuav pab tau rau hauv cov ntaub ntawv.
Nyob hauv glycerine uas oh pawg twg muaj nyob?
Teb: Cov molecule ntawm glycerol muaj ob pawg thawj cawv (-OH) thiab ib pawg cawv thib ob (-OH) yog li nws qhia cov yam ntxwv ntawm cov cawv thawj thiab theem nrab. Thawj pawg -OH pawg muaj ntau dua reactive dua pawg -OH pawg. Puas muaj pes tsawg pawg thawj thiab theem nrab hydroxyl muaj nyob hauv glycerine?
Pawg ntseeg hauv pawg ntseeg yog dab tsi?
Pawg pawg yog tsawg kawg ntawm cov tswv cuab ntawm lub rooj sib tham txiav txim siab (ib lub koom haum uas siv cov txheej txheem kev cai lij choj, xws li kev tsim cai lij choj) tsim nyog los ua lag luam ntawm pab pawg ntawd. pawg ntseeg txhais li cas hauv txoj cai?
