Likokoana-hloko tsa pyrethroid li na le litšobotsi tse matla tsa chiral 'me hangata li na le li-enantiomers tse ngata tsa chiral.Leha li-enantiomers tsena li na le thepa e tšoanang hantle ea 'mele le ea lik'hemik'hale, li bonts'a mesebetsi e fapaneng ka ho felletseng ea ho bolaea likokoanyana le thepa ea tlhaho ka har'a vivo.Chefo le maemo a masalla a tikoloho.Tse kang Cypermethrin, Beta-Cypermethrin, Alpha-cypermethrin;beta-cypermethrin, cyhalothrin;Beta Cyfluthrin, cyfluthrin, joalo-joalo.

Cypermethrin
Cypermethrin ke sebolaea-likokoanyana se sebelisoang ka ho fetisisa sa pyrethroid.Sebopeho sa eona sa limolek'hule se na le litsi tse 3 tsa chiral le li-enantiomers tse 8.Li-enantiomers tse fapaneng li bonts'a phapang e kholo ts'ebetsong ea tlhaho le chefo.
Li-isomers tse 8 tsa mahlo tsa Cypermethrin li etsa lipara tse 4 tsa li-racemates.Ho na le phapang e totobetseng ea phello ea ho bolaea le lebelo la photolysis la li-isomer tse fapaneng tsa Cypermethrin ka likokoanyana.Mosebetsi oa bona oa ho bolaea likokoanyana ho tloha ho matla ho isa ho a fokolang ke cis, trans Formula, cis-trans cypermethrin.
Har'a li-isomers tse robeli tsa Cypermethrin, tse peli ho tse 'nè tsa li-isomers le li-cis isomers tse' nè li sebetsa hantle haholo.
Leha ho le joalo, haeba isomer e le 'ngoe e sebetsang hantle haholo ea Cypermethrin e sebelisoa e le chefo e bolaeang likokoanyana, ha se feela hore ts'ebetso ea eona ea ho bolaea likokoanyana e ka ntlafatsoa haholo, empa hape le chefo ho likokoana-hloko tse sa lebelloang le liphello tse mpe tikolohong li ka fokotseha.Ka hona, Beta-Cypermetrin le Alpha-cypermetrin li ile tsa hlaha:

Alpha-cypermetrin
Alpha-cypermethrin e arola mefuta e 'meli e fokolang kapa e sa sebetseng hantle ho tloha motsoako o nang le li-cis-isomers tse' nè, 'me e fumana motsoako oa 1: 1 o nang le li-cis-isomers tse peli feela tse sebetsang hantle.
Alpha-cypermethrin e na le ts'ebetso ea Cypermethrin ka makhetlo a mabeli.

Beta-Cypermetrin
Beta-Cypermethrin, lebitso la Senyesemane: Beta-Cypermethrin
Beta-Cypermethrin e boetse e bitsoa ts'ebetso e phahameng ea cis-trans cypermethrin.E fetola mofuta o sa sebetseng oa cypermethrin ea tekheniki e nang le li-isomers tse 8 hore e be sebopeho se sebetsang hantle ka ho sebelisa catalytic isomerization, ka hona ho fumana li-isomers tsa cis tse sebetsang hantle le cypermethrin e sebetsang hantle.Motsoako oa lipara tse peli tsa racemates tsa trans isomers e na le li-isomers tse 4, 'me karolelano ea cis le trans e ka ba 40:60 kapa 2:3.
Beta-Cypermethrin e na le thepa ea ho bolaea likokoanyana joalo ka Cypermethrin, empa katleho ea eona ea ho bolaea likokoanyana e batla e phahame ka makhetlo a 1 ho feta Cypermethrin.
Beta-Cypermethrin ha e na chefo e ngata ho batho le liphoofolo, 'me chefo ea eona ho likokoanyana tsa bohloeki e lekana kapa e kholo ho feta Alpha-cypermethrin, kahoo e na le melemo e itseng ho thibela le ho laola likokoanyana tse senyang bohloeki.

Akaretsa
Kaha ts'ebetso ea likokoana-hloko ea mofuta oa cis-high-efficiency ka kakaretso e phahame ho feta ea mokhoa oa trans-high-efficiency, taelo ea ts'ebetso ea likokoana-hloko ea banab'abo ba bararo ba cypermethrin e lokela ho ba: Alpha-cypermethrin≥Beta-Cypermethrin>Cypermethrin.
Leha ho le joalo, Beta-Cypermethrin e na le phello e betere ea taolo ea likokoanyana ho feta lihlahisoa tse ling tse peli.