Ko ngā ketone me ngā ester he rōpū mahi tino nui i roto i te matū waro. Ka kitea rātou i roto i te tini o ngā pūhui waro, ā, he mahi nui tā rātou i roto i ngā tukanga koiora me ngā tukanga matū. Ahakoa ō rātou āhua rite, he rerekē rawa ō rātou āhuatanga me ā rātou whanonga. Me tūhuratia he aha ngā ketone me ngā ester, he aha ō rāua rerekētanga, he aha ō rāua āhua rite, me te tikanga o rāua i roto i te matū me te koiora.
Ko ngā Ketone he momo matū waro kei roto he rōpū mahi carbonyl (C=O) kei waenganui o te ngota ngota. E rua ngā rōpū alkyl, aryl rānei o ngā Ketone e piri ana ki te waro carbonyl. Ko te mea māmā rawa ko te acetone, ko tōna tauira (CH3)2CO. Ka puta mai ēnei mā te pakaru o te ngako i roto i te tinana. E mōhiotia ana hoki ko ngā tinana ketone, he matū ka puta mai ngā ketone ina tīmata tō tinana ki te pakaru i te ngako, kaua ki ngā warowaihā hei pūngao.
Ka hangaia ngā ketone mai i ngā waikawa ngako i roto i te ate, ka tukuna ki roto i te toto, ka taea te whakamahi hei puna pūngao mō ngā pūtau me ngā whekau o te tinana. Ina kei roto te tinana i te ketosis, ka whakawhirinaki ki ngā ketone hei puna wahie matua, kaua ki te hukahuka, koia te take i tino rongonui ai te kai ketogenic i ngā tau tata nei. Heoi, ehara i te mea ka puta noa ngā ketone i te wā nohopuku, i te kai ketogenic rānei. Ka taea hoki te whakaputa i te wā e pāngia ana te tinana e te ahotea, pērā i te wā e whakakorikori tinana ana, i te wā rānei e kore e nui te insulin i roto i te tinana, ka pā pea tēnei ki te hunga mate huka.
E toru ngā ketone ka puta i te wā ketosis: te acetone, te acetoacetate, me te beta-hydroxybutyrate (BHB). I roto i ēnei, ko te acetone he ketone ka puta mai i te tinana mā te manawa, ka puta he kakara hua, he kakara reka rānei i roto i te manawa, e mōhiotia whānuitia ana ko te "manawa keto". He tohu pea tēnei kua uru tō tinana ki te āhua ketosis. Ko te Acetoacetate, tētahi atu ketone, ka puta i roto i te ate, ā, ka whakamahia e ngā pūtau tinana hei pūngao. Heoi, ka huri anō hoki ki te BHB, te momo ketone tino noa i roto i te toto i te wā ketosis. Ka taea e te BHB te whiti ngāwari i te arai toto-roro, ka whakahihiko i te roro, ā, ka taea te whakapai ake i te māramatanga hinengaro me te arotahi.
He pūhui waro ngā ester me te mahi RCOOR', ā, ko R me R' tētahi rōpū waro. Ka hangaia ngā ester ina tauhohe ngā waikawa carboxylic me ngā waipiro i raro i ngā āhuatanga waikawa, ā, ka whakakorea he ngota wai. He mea noa ēnei i roto i ngā hinu kakara me te maha o ngā hua. Hei tauira, ko te kakara o ngā panana pakari i ahu mai i tētahi ester e kiia nei ko te isoamyl acetate. He āhuatanga ahurei ō ngā ester e whai hua ai rātou i roto i ngā momo ahumahi.
1. Ngā kakara
Ko tētahi o ngā whakamahinga tino noa o ngā esters ko ngā mea kakara me ngā hinu kakara nā te mea he reka, he hua, he reka hoki te kakara, ā, ka āwhina anō hoki ki te whakarei ake i te kakara whānui o tētahi hua, kia ataahua ake ai ki ngā kaiwhakamahi.
2. Te reka o te kai
Nā te hanganga matū ahurei o ngā ester ka taea e rātou te whakaputa kakara hua me te kakara putiputi, nō reira ka whakamahia hoki ngā ester i roto i te umanga kai, inā koa i roto i ngā mea kakara. He mea noa tēnei i roto i te maha o ngā kai tae atu ki ngā mea reka, ngā kai tunutunu me ngā inu. I roto i te oranga o ia rā, kua whakamahia ngā ester ki te hanga kakara horihori, ā, kua noho hei kai matua i roto i te maha o ngā kai.
3. Kirihou
Hei mea hanga kirihou, ka ngāwari ake, ka roa ake hoki ngā kirihou mā ngā ester. Nō reira, ka whakamahia ngā ester ki te hanga i ngā momo kirihou, ā, ka āwhina hoki ki te ārai i te pakarukaru o ngā kirihou i te roanga o te wā. He mea nui tēnei mō ngā hua pakari pērā i ngā wāhanga motuka, ngā taputapu hauora rānei.
4. Whakarewa
Nā te mea ka taea e ngā ester te whakarewa i ngā matū waro pēnei i te hinu, te kapia me te ngako. Nō reira, he pai ngā ester i roto i te maha o ngā ahumahi hei whakarewa mō te whakarewa i ētahi atu matū. He pai ngā ester hei whakarewa, ā, he pai hoki mō te hanga peita, wanihi me ngā piripiri.
Mā te whakataurite i ngā ketone me ngā esters, ka kitea e tātou ko te rerekētanga i waenga i ngā ketone me ngā esters kei roto i ngā āhuatanga e whai ake nei:
1. Ko te rerekētanga matua i waenga i ngā ketone me ngā esters kei roto i te hanganga matū. Kei waenganui o te mekameka waro te rōpū carbonyl o ngā ketone, ko te rōpū carbonyl ia o ngā esters kei te pito o te mekameka waro. Nā tēnei rerekētanga hanganga ka rerekē ō rātou āhuatanga ā-tinana me te matū.
●Ko ngā ketone he pūhui waro kei a rātou he rōpū carbonyl e tito ana i te ngota hāora e hono rua ana ki te ngota waro kei waenganui o te mekameka waro. Ko tō rātou tauira matū ko R-CO-R', ko R me R' he alkyl, he aryl rānei. Ka hangaia ngā ketone mā te waikura o ngā waipiro tuarua, mā te wehenga rānei o ngā waikawa carboxylic. Ka pāngia hoki rātou e te tautomerism keto-enol, arā, ka taea e rātou te noho i roto i ngā āhua ketone me te enol. He mea noa te whakamahi i ngā ketone i roto i te hanga o ngā whakarewa, ngā rauemi polymer me ngā rongoā.
●Ko ngā ester he pūhui waro kei te pito o te mekameka waro he rōpū carbonyl me te rōpū R e piri ana ki te ngota hāora. Ko tō rātou tauira matū ko R-COOR', ko R me R' he alkyl, he aryl rānei. Ka hangaia ngā ester mā te tauhohenga o ngā waikawa carboxylic me ngā waipiro i te aroaro o tētahi whakakorikori. He kakara hua tō rātou, ā, he maha ngā wā ka whakamahia ki te hanga hinu kakara, ngā waikano me ngā mea whakakorikori.
2.Ko te rerekētanga tino kitea i waenga i ngā ketone me ngā esters ko tō rātou pāmahana kohua. He teitei ake te pāmahana kohua o ngā ketone i ō ngā esters nā te mea he kaha ake ō rātou kaha i waenga i ngā ngota ngota. Ka taea e te rōpū carbonyl i roto i te ketone te hanga hononga hauwai me ngā ngota ketone tata, ka hua ake he kaha ake ngā kaha i waenga i ngā ngota ngota. He rerekē, he ngoikore ake ngā kaha i waenga i ngā esters nā te kore e taea e ngā ngota hāora i roto i te rōpū R te hanga hononga hauwai me ngā ngota esters tata.
3.Hei tāpiritanga, he rerekē te tauhohenga o ngā ketone me ngā esters. Nā te mea e rua ngā rōpū alkyl, aryl rānei i ia taha o te rōpū carbonyl, he nui ake te tauhohenga o ngā ketone i ngā esters. Ka taea e ēnei rōpū te tuku i ngā irahiko ki te carbonyl, ka ngawari ake te whakaeke i te nucleophilic. He rerekē, he iti ake te tauhohenga o ngā esters nā te mea he rōpū alkyl, aryl rānei kei runga i te ngota hāora. Ka taea e tēnei rōpū te tuku i ngā irahiko ki te ngota hāora, ka iti ake te ngoikore ki te whakaeke nucleophilic.
4. Nā te rerekētanga o ngā hanganga, ngā ira kohua me te tauhohenga o ngā ketone me ngā esters, ka whakatauhia ngā rerekētanga o ō rātou whakamahinga. He maha ngā wā ka whakamahia ngā ketone ki te hanga whakarewa, rauemi polymer me ngā rongoā, ko ngā esters ia he maha ngā wā ka whakamahia ki te hanga kakara, kakara me ngā mea hanga kirihou. Ka whakamahia hoki ngā ketone hei tāpiri wahie i roto i te penehīni, ko ngā esters ia he hinu whakahinuhinu i roto i ngā mīhini.
E mōhio ana tātou ki ngā taipitopito o ngā ketone me ngā esters, nō reira he aha te rerekētanga i waenga i ngā ketone, ngā esters me te ether?
Tuatahi, me mōhio tātou he aha te etera? Kei roto i te etera he ngota hāora e honoa ana ki ngā ngota waro e rua. He matū e mōhiotia ana mō ōna āhuatanga narcotic. Ko te etera he kore tae, he iti ake te matotoru i te wai, ā, he pai hoki hei whakarewa mō ētahi atu matū waro pēnei i te hinu me te ngako. Ka whakamahia hoki hei tāpiri wahie i roto i ngā miihini penehīni hei whakapai ake i te mahi a ngā miihini.
I muri i te mārama ki ngā hanganga matū me ngā whakamahinga o ēnei e toru, ka mārama tātou ko ngā rerekētanga i waenga i ngā ketone, ngā esters me te ether e whai ake nei:
1. Ko tētahi o ngā rerekētanga tino kitea i waenga i ngā ketone, ngā esters, me te ether ko ō rātou rōpū mahi. Kei roto i ngā ketone ngā rōpū carbonyl, kei roto i ngā esters ngā hononga ester-COO-, ā, kāore he rōpū mahi kei roto i ngā ether. He rite tonu ngā āhuatanga matū o ngā ketone me ngā esters. He polar ngā pūhui e rua, ā, ka taea te hanga hononga hauwai me ētahi atu ngota, engari he kaha ake ngā hononga hauwai i roto i ngā ketone i ērā i roto i ngā esters, ka hua ake he pāmahana kohua teitei ake.
2.Ko tētahi atu rerekētanga nui ko te rerekētanga o ngā whakamahinga e toru
(1)Ko tētahi o ngā whakamahinga tino noa o ngā ketone ko te whakarewa mō ngā kapia, ngā ware pi, me ngā hinu. Ka whakamahia hoki ēnei i roto i te hanga matū pai, ngā rongoā me ngā matū ahuwhenua. Ko ngā ketone pēnei i te acetone ka whakamahia i roto i te hanga kirihou, muka me ngā peita.
(2)E whakamahia whānuitia ana ngā ester i roto i ngā ahumahi kai me ngā ahumahi whakapaipai mō tō rātou kakara me te reka. E whakamahia ana hoki hei whakarewa mō ngā waituhi, ngā wanihi me ngā polymer. E whakamahia ana hoki ngā ester i roto i te hanga kapia, ngā mea hanga kirihou me ngā mea horoi.
(3)He whānuitia ngā whakamahinga o te etera nā ō rātou āhuatanga ahurei. Ka whakamahia hei whakarewa, hei rongoā whakangote me hei rongoā horoi, me ētahi atu. I roto i te umanga ahuwhenua, ka whakamahia hei whakakino hei tiaki i ngā hua kua rongoatia mai i ngā pepeke me ngā mate harore. Ka whakamahia hoki te etera i roto i te hanga kapia epoxy, ngā piripiri me ngā rauemi whakakikorua.
He whānuitia ngā whakamahinga o ngā ketone me ngā esters i roto i te matū waro, ā, he poraka hanga hoki mō ngā tukanga ahumahi maha. Hei tauira, ka whakamahia ngā ketone hei whakarewa, i roto i te hanga rongoā me ngā polymer. Ko ngā esters, i tētahi atu ringa, ka whakamahia i roto i te umanga hinu kakara me te whakapaipai, hei mea kakara i roto i te umanga kai, hei whakarewa, tae atu ki ngā peita me ngā paninga.
Wā tuku: Pipiri-14-2023
