Mibvunzo yeMienzaniso neKukurukurirana kweMabatiro Akananga muMapoka Anoshanda
Mumakemikari echisikigo, boka rinoshanda iboka remaatomu ari mukati memorekuru rine basa remakemikari ayo uye reactivity yayo. Kunzwisisa kwakakwana maitiro chaiwo anosanganisira mapoka akasiyana-siyana ekushanda kwakakosha kuti uzive basa iri. Chinyorwa chino chichataura nezvemienzaniso yakati wandei uye chichakurukura maitiro chaiwo anosanganisira mapoka akawanda ekushanda akajairika, anosanganisira alkanes, alkenes, alkynes, alcohols, ethers, aldehydes, ketones, carboxylic acids, esters, uye amines.
1. Maitiro ekuchinjana muAlkanes
Muenzaniso wezvinetso
Kuita kwemethane (CH₄) nechlorine (Cl₂) pasi pesimba rechiedza che ultraviolet (UV) kunoburitsa zvinhu zvakasiyana-siyana. Nyora maitiro anoitika uye ratidza chigadzirwa chikuru.
Kukurukurirana
MaAlkanes kazhinji haashande zvakanyanya, asi anogona kuita kuburikidza ne free radical substitution reactions. Pano, methane inobatana ne chlorine muitiro unozivikanwa se free radical halogenation, iyo inogona kupatsanurwa seinotevera:
1. Kutanga: Kuumbwa kwe chlorine radicals nekuparadzaniswa kwe homolytic kuburikidza nekutorwa kwesimba reUV.
\[
Cl_2 \museve wekurudyi 2Cl^\bara
\]
2. Kupararira: Chlorine radicals inorwisa mamorekuru emethane kuti igadzire methyl radicals uye hydrochloric acid:
\[
Cl^\bara + CH_4 \museve wekurudyi CH_3^\bara + HCl
\]
Tevere, methyl radical inopindirana neimwe chlorine molecule kuti igadzire chloromethane uye chlorine radical itsva:
\[
CH_3^\bara + Cl_2 \museve wekurudyi CH_3Cl + Cl^\bara
\]
3. Kugumiswa: MaRadicals anosangana uye anoumba zvigadzirwa zvakagadzikana:
\[
Cl^\bara + Cl^\bara \museve wekurudyi Cl_2
\]
\[
CH_3^\bara + Cl^\bara \museve wekurudyi CH_3Cl
\]
\[
CH_3^\bara + CH_3^\bara \museve wekurudyi C_2H_6
\]
Chinhu chikuru chinobva mukuita uku ichloromethane (CH₃Cl).
2. Kuwedzera Maitiro muAlkenes
Muenzaniso wezvinetso
Propylene (C₃H₆) inopindirana nebromine (Br₂) mumamiriro ezvinhu asiri epolar. Nyora maitiro anoitika uye taura chigadzirwa chikuru.
Kukurukurirana
MaAlkenes anogona kutora chikamu mukuita electrophilic addition reactions. Mumamiriro ezvinhu asiri epolar, reaction nebromine inosanganisira kuumbwa kwebromonium ion se intermediate:
1. Kuumbwa kwemaion ebromonium:
\[
C_3H_6 + Br_2 \rightarrow [C_3H_6Br]^+ + Br^-
\]
2. Iyo bromide ion inobva yarwisa imwe yemacarbon ari muiyo bromonium ion, yogadzira chigadzirwa chekuwedzera 1,2-dibromoalkane:
\[
[C_3H_6Br]^+ + Br^- \rightarrow C_3H_6Br_2
\]
Chigadzirwa chikuru i1,2-dibromopropane (C₃H₆Br₂).
3. Kuwedzera Maitiro eAlkynes
Muenzaniso wezvinetso
Ethylene (C₂H₂) inopindirana nemvura kana paine sulfuric acid yakawanda uye mercury(II) sulfate. Nyora mashandiro anoita reaction uye zvigadzirwa zvikuru.
Kukurukurirana
MaAlkynes anoita zvinoenderana nemvura kuburikidza nekuwedzera sulfuric acid ne mercury (II) se catalyst, zvichigadzira vinyl alcohol, iyo inobva yashanduka kuita ketone (auto-tautomerization). Matanho acho ndeaya anotevera:
1. Kuumbwa kwe alkenyl mercury complex:
\[
HC \equiv CH + HgSO_4 \rightarrow [HC=CH_2Hg]SO_4
\]
2. Kuwedzera mvura:
\[
[HC=CH_2Hg]SO_4 + H_2O \museve wekurudyi [CH_3CH_2OH]SO_4
\]
3. Kugadziriswa kwetautomerization kunogadzira acetaldehyde:
\[
CH_3CHO
\]
Chigadzirwa chikuru chemuitiro uyu iacetaldehyde (CH₃CHO).
4. Maitiro eOxidation muDoro
Muenzaniso wezvinetso
Kutanga, butanol (1-butanol, CH₃(CH₂)₃OH) inosanganiswa neacidic ne potassium permanganate (KMnO₄). Nyora maitiro anoitika uye chigadzirwa chekupedzisira.
Kukurukurirana
1-butanol ichaoxidation kuenda ku-butanal (aldehyde) uye yozoenda ku-butanoic acid (carboxylic acid):
1. Kuoxidation kwekutanga kuita aldehyde (butanal):
\[
CH₃(CH₂)₂CH₂OH \museve wekurudyi CH₃(CH₂)₂CHO
\]
2. Kuwedzera oxidation ku carboxylic acid (butanoic acid):
\[
CH₃(CH₂)₂CHO + [O] \museve wekurudyi CH₃(CH₂)₂COOH
\]
Chibereko chekupedzisira chemuitiro uyu ibutanoic acid (CH₃(CH₂)₂COOH).
5. Kuchinja kweHydrolysis kweEsters
Muenzaniso wezvinetso
Methyl acetate (CH₃COOCH₃) inonyungudika mumvura kana paine acidity. Nyora mhinduro inoitika wobva waona chinhu chikuru chiri kuigadzira.
Kukurukurirana
MaEsters anozoitwa hydrolysis kana paine acidity kuti agadzire carboxylic acids uye alcohols:
1. Kuumbwa kwemaester:
\[
CH₃COOCH₃ + H^+ \rightarrow [CH₃COOHCH₃]^+
\]
2. Kuwedzera mvura uye kurasikirwa kwemethanol:
\[
[CH₃COOHCH₃]^+ + H_2O \museve wekurudyi CH₃COOH + CH₃OH
\]
Zvigadzirwa zvikuru zvemuitiro uyu iacetic acid (CH₃COOH) uye methanol (CH₃OH).
6. Maitiro ekuchinjana kweNucleophilic muEthers
Muenzaniso wezvinetso
Dimethyl ether (CH₃OCH₃) inopindirana nehydroiodic acid (HI) pakupisa kwakanyanya. Nyora maitiro anoitika uye chigadzirwa chikuru.
Kukurukurirana
MaEther achasangana nemaitiro ekutsiva nucleophilic pasi pesimba remaacids akadai sehydroiodic acid:
1. Kuumbwa kweEther:
\[
CH₃OCH₃ + HI \museve wekurudyi [CH₃OHCH₃]^+I^-
\]
2. Kurasikirwa kwe iodomethyl uye kuumbwa kwe methanol:
\[
[CH₃OHCH₃]^+I^- \rightarrow CH₃OH + CH₃I
\]
Zvigadzirwa zvikuru zvemuitiro uyu methanol (CH₃OH) uye iodomethane (CH₃I).
Nekunzwisisa kwakasimba kwemaitiro chaiwo emapoka akasiyana-siyana anoshanda, tinogona kugadzira nzira dzekugadzira, kufanotaura zvigadzirwa zvemaitiro, uye kunzwisisa hunhu hwemakemikari emamorekuru akaomarara. Maitiro ataurwa pano akakosha uye ane mashandisirwo akakura mumapazi akasiyana-siyana emakemikari eorganic nebiochemistry.
