Magungunan kashe qwari na Pyrethroid suna da halaye masu ƙarfi na chiral kuma yawanci suna ƙunshi enantiomers da yawa.Ko da yake waɗannan enantiomers suna da daidai gwargwado na zahiri da sinadarai iri ɗaya, suna baje kolin ayyukan kashe kwari daban-daban da kaddarorin halittu a vivo.Guba da matakan saura muhalli.Irin su Cypermethrin, Beta-Cypermethrin, Alpha-cypermethrin;beta-cypermethrin, cyhalothrin;Beta Cyfluthrin, cyfluthrin, da dai sauransu.

Cypermethrin
Cypermethrin shine maganin kashe kwari na pyrethroid da aka fi amfani dashi.Tsarin kwayoyin halittarsa ​​ya ƙunshi cibiyoyin chiral 3 da 8 enantiomers.Daban-daban masu haɓakawa suna nuna bambance-bambance masu mahimmanci a cikin ayyukan nazarin halittu da guba.
Isomers na gani guda 8 na Cypermethrin suna samar da nau'i-nau'i 4 na abokan tsere.Akwai bambance-bambance a bayyane a cikin tasirin kisa da saurin photolysis na isomers na Cypermethrin daban-daban akan kwari.Ayyukan su na kwari daga karfi zuwa rauni shine cis, trans Formula, cis-trans cypermethrin.
Daga cikin isomers takwas na Cypermethrin, biyu daga cikin isomers huɗu na trans isomers da cis isomers huɗu suna da inganci sosai.
Koyaya, idan ana amfani da isomer mai inganci guda ɗaya na Cypermethrin azaman maganin kashe qwari, ba wai kawai za'a iya inganta ayyukansa na kwari ba, har ma da guba ga ƙwayoyin da ba su da manufa da kuma illa ga muhalli na iya ragewa.Don haka Beta-Cypermethrin da Alpha-cypermethrin sun kasance:

Alpha-cypermethrin
Alpha-cypermethrin ya raba nau'i-nau'i biyu masu sauƙi ko rashin tasiri daga cakuda mai dauke da cis-isomers guda hudu, kuma ya sami 1: 1 cakuda mai dauke da cis-isomers guda biyu kawai.
Alpha-cypermethrin yana da aikin kwari sau biyu na Cypermethrin.

Beta-cypermethrin
Beta-Cypermethrin, Turanci sunan: Beta-Cypermethrin
Beta-Cypermethrin kuma ana kiransa babban inganci cis-trans cypermethrin.Yana jujjuya nau'in cypermethrin na fasaha mara amfani wanda ke dauke da isomers 8 a cikin nau'i mai inganci ta hanyar isomerization na catalytic, don haka samun babban cis isomers da cypermethrin mai inganci.Cakuda nau'i-nau'i biyu na abokan tsere na trans isomers ya ƙunshi isomers 4, kuma rabon cis da trans shine kusan 40:60 ko 2:3.
Beta-Cypermethrin yana da kaddarorin kwari iri ɗaya kamar Cypermethrin, amma tasirin maganin kashe kwari yana kusan sau 1 sama da na Cypermethrin.
Beta-cypermethrin ba shi da guba sosai ga mutane da dabbobi, kuma gubarsa ga kwari masu tsafta daidai yake da ko girma fiye da Alpha-cypermethrin, don haka yana da wasu fa'idodi a cikin rigakafi da kula da kwari masu tsafta.

Takaita
Tun da aikin nazarin halittu na cis-high-efficiency form ne kullum mafi girma fiye da na trans-high-efficiency form, oda na insecticidal aiki na 'yan'uwa uku na cypermethrin ya kamata: Alpha-cypermethrin≥Beta-Cypermethrin>Cypermethrin.
Koyaya, Beta-Cypermethrin yana da mafi kyawun tasirin kula da kwari fiye da sauran samfuran biyu.