Riba:
- Ƙarfin fahimtar bambanci tsakanin tsinkayar amsawar gaba da retrosynthesis da kuma tambayar basirar wucin gadi don madadin hanyoyin da mataki mafi haɗari.
- Sanin cewa lambobin yanayin, yawan amfanin ƙasa da sunaye masu rarrafe suna da rauni a cikin basirar wucin gadi da tabbatar da su tare da wallafe-wallafe da kasida.
- Ikon tsara tsabtar samfur da aminci daga farkon ta hanyar tambayar halayen gefe daban da bayyane
Hasashen Amsa da Makanikai: Samfura, Yanayi da Hasashen Hasashen Aiki tare da AI
Akwai tambayoyi guda biyu da masanin ilmin sinadarai ke yi akai-akai: "Me zai faru idan na haxa waɗannan abubuwa?" da "Me zan yi don samun samfurin da nake so?" Na farko shine tambayar tsinkayar amsawar gaba (daga kayan farawa zuwa samfurin), na biyu shine tambayar retrosynthesis (daga baya daga samfurin zuwa kayan farawa). AI abokin haɗin gwiwa ne mai mahimmanci a cikin duka biyu: lissafin samfuran yuwuwar, yana nuna yanayi, yana haifar da halayen gefe. Amma gwaje-gwaje da wallafe-wallafe sun yanke shawarar ko amsawar za ta yi aiki da gaske, menene ingancinsa zai kasance, da ko yana da aminci. A cikin wannan rukunin, za mu koyi amfani da AI a cikin shirin amsawa cikin ƙarfi amma sarrafawa.
Bambanci tsakanin tsinkayar gaba da retrosynthesis
Hasashen gaba: Kuna da kayan farawa da reagents; "Menene samfurin?" ka tambaya. Alal misali, idan kun bi da barasa na farko tare da oxidant, za ku iya ƙare tare da aldehyde ko carboxylic acid; Wanne yake zuwa ya dogara da reagent da yanayin. AI yawanci ya san wannan rarrabuwa da kyau, amma yana iya zama kuskure akan cikakkun bayanai.
Retrosynthesis: Kuna da kwayoyin manufa; "Wane sassa mafi sauƙi zan iya yin wannan daga?" ka koma. Kowane mataki na baya yana ba da shawarar "yanke" (katsewa). AI yana da kyau a rarraba ta hanyoyi daban-daban; Amma wajibi ne a tabbatar da wallafe-wallafen cewa kowane mataki na hanyar da ya ba da shawara yana aiki a zahiri.
Tukwici: Maimakon tambayar AI don kawai "hanya mafi kyau," tambayi 2-3 madadin hanyoyi da raunin kowane ("wane mataki ne mai haɗari?"). Zaba tsakanin hanyoyin ya fi aminci fiye da bin hanya ɗaya makauniyar hanya.
Mechanism: fahimtar dalilin da yasa yake faruwa
Tsarin amsawa yana nuna mataki zuwa mataki inda electrons ke tafiya da kuma cikin wane tsari. AI malami ne mai kyau a cikin bayanin tsarin: yana bayyana kawai ra'ayoyin nucleophile (mai arzikin lantarki, nau'in ba da gudummawar lantarki), electrophile (matalauta, nau'in karɓa na lantarki), samfurin tsaka-tsaki da yanayin canji. Duk da haka, yana iya zana "kibiyoyi" masu banƙyama a cikin hadaddun dabaru ko na zamani. Kwatanta bayanin tsarin tare da tushen sinadarai na halitta.
Mataki-mataki: Tsarin amsawa tare da AI
- Ba da manufa daidai: Ƙayyade samfur da kayan farawa, idan akwai, tare da SMILES (naúrar da ta gabata).
- Matsalolin jiha: sikelin (mmol/mol), reagents don gujewa, akwai sauran kaushi, iyakokin aminci.
- Nemi madadin: Hanyoyi 2-3 da tsammanin inganci da haɗarin kowane.
- Tambayi game da amsawar gefe: Abubuwan da ke yiwuwa a kowane mataki da yadda za a rage su.
- Tabbatarwa tare da wallafe-wallafe: Tabbatar da matakin maɓalli da aka tsara tare da ainihin labarin/babban bayanai (Reaxys, SciFinder da sauransu).
- Duban tsaro: Bincika SDS na kowane reagent (raka'a 9).
Samfura huɗu masu kwafi
1) Hasashen martani na gaba:
Farawa kayan (SMILES): Benzyl barasa: Occ1ccccc1Reagent: PCC (pyridinium chlorochromate), a cikin dichloromethane.Task: 1) Mene ne babban samfurin (SMILES + ad)? 2) Me ya sa wannan samfurin ya kafa, aldehyde ko carboxylic acid, barata? 3) Yiwuwa ta-samfurori? game da.
2) Retrosynthesis:
Kwayoyin manufa (SMILES): O = C (c1ccccc1) c1ccc (OC) cc1 (4-methoxybenzophenone) Ƙuntatawa: Sikelin 10 mmol; Ana iya amfani da reagents na Grignard. Aiki: Ba da madadin hanyoyin retrosynthesis guda 2. Ga kowane hanya: yanke yanke, kayan farawa da ake buƙata (SMILES), reagent + yanayin kowane mataki da ƙimar yawan amfanin ƙasa. Alama mataki mafi haɗari.
3) Bayanin injina:
Reaction: Acid-catalyzed dehydration na barasa na biyu (E1). Aiki: Bayyana tsarin, mataki-mataki, tare da motsi na lantarki. A kowane mataki: wane nau'in nucleophile / electrophile, wanda matsakaicin samfurin ya kasance. Hakanan nuna fifikon samfuran ku na Zaitsev/Hofmann. Harshe: Baturke a sarari, ayyana kalmomi lokacin da aka fara ambata.
4) Haɓaka yanayi (ƙarar tunani):
Amsa: Samar da haɗin amide (carboxylic acid + amine). Haɗin kai reagents muna da: EDC, DCC, HATU. Aiki: Ba da tebur na abũbuwan amfãni / rashin amfani (samarwa, sauƙi na tsarkakewa, farashi, aminci) ga kowane reagent. Wanne za ku zaɓa a cikin wane yanayi? Lura: Kada ku yi da'awar ainihin inganci; Zan tabbatar da wallafe-wallafe.
Rauni mai ƙarfi / Ƙarfi mai ƙarfi
Rauni:
Me zai faru idan kun haɗa waɗannan abubuwa biyu?
Ba a bayyana abin da abubuwa (babu tsarin), wanda rabo, wanda yanayin, wanda sauran ƙarfi. AI yana samar da kasawa kuma yana iya isar da samfurin da bai dace ba.
Mai ƙarfi:
Mai farawa: acetic anhydride (CC (= O) OC (= O) C) + salicylic acid (OC (= O) c1ccccc1O), mai kara kuzari: sulfuric acid mai mahimmanci ('yan saukad da), ~ 85 ° C, 15 min. Aiki: 1) Babban samfuri (SMILES + ad), 2) taƙaitaccen tsari, 3) samfuri da tsarkakewa, 4) gargaɗin aminci. Yi alama a inda ba ku da tabbas.
Bambanci: kowane fara magana tare da SMILES, ƙima / yanayi a kunne, an daidaita fitarwa, tsaro da ake buƙata. (Wannan misalin shine haɗin aspirin.)
Inda AI ke da ƙarfi da rauni a cikin tsinkayar amsawa
Magana
Shin AI mai ƙarfi ne?
Bayanan kula
Gane nau'in amsawa
mai karfi
Oxidation, ester samuwar, da dai sauransu sanannun
Hasashen babban samfurin (classic)
Gabaɗaya mai ƙarfi
Dogara a cikin ingantaccen rubuce-rubucen halayen
Daidaitattun yawan amfanin ƙasa/lambobin yanayi
mai rauni
Zazzabi, tsawon lokaci, inganci akai-akai ba daidai ba ne
Sabo/sabuwar amsawa
mai rauni
Akwai babban haɗari na ƙirƙira, wallafe-wallafen dole ne
Tunatar amsawar gefe
matsakaici-karfi
Mai kima a matsayin jerin abubuwan dubawa
Zaɓin Regio/Stereo
Mai canzawa
Dokokin masu sauƙi suna da kyau, masu rikitarwa ba su da talauci
kananan lokuta
Case 1 - Samfurin daidai, yanayin da ba daidai ba. Wani ɗalibi ya shirya fischer esterification. YZ ya ba da samfurin daidai amma ya ce "za'a kammala shi a cikin mintuna 10 a zafin jiki". Littattafai sun nuna cewa wannan daidaitaccen amsa yana ɗaukar sa'o'i a reflux kuma yana buƙatar cire ruwa. Idan ɗalibin bai gyara yanayin ba, da ya ci karo da 5% yawan amfanin ƙasa. Darasi: koda samfurin daidai ne, tabbatar da lambobi tare da adabi.
Case na 2 - Ƙwararren mai haɓakawa. YZ ya samar da sunan mai kara kuzari mara wanzuwa don amsawar haɗin gwiwa a cikin nau'in "Pd(XYZ)4". Lokacin da ɗalibin ya bincika a cikin kasida, bai same shi ba; AI ya sanya sunan. Haƙiƙanin haɓakawa shine Pd(PPh3)4. Darasi: tabbatar da reagent da sunaye masu haɓakawa a cikin ainihin kasida.
Hali na 3 - Halin da ba a kula da shi ba. A cikin haɓakar amine na farko, AI ya ba da babban samfuri amma da farko ya ketare haɗarin acylation biyu tare da wuce gona da iri. Idan mai amfani ya tambayi "samfuran da za a iya samu?" Lokacin da na yi tambaya a sarari, AI ta ƙara wannan kuma ta ba da shawarar iyakance stoichiometry zuwa daidai 1.05. Darasi: Yi tambaya game da martanin gefe daban kuma a sarari, maiyuwa ba zai zo da gaggawa ɗaya ba.
Kuskuren gama gari
- Amfani da lambobi kamar yadda yake. Zazzabi, lokaci, daidai da inganci sune yankuna mafi rauni a cikin AI; Tabbatar da wallafe-wallafe.
- Hanya guda ita ce tambaya. Shirin ba tare da madadin ba yana sa matakin haɗari marar ganuwa.
- Ba tambaya game da martanin gefe ba. Ko da babban samfurin ya dubi daidai, samfurori na samfurori sun ƙayyade tsabta.
- Ba tabbatar da sunan reagent ba. Za a iya yin sunaye masu haɓakawa/ligand waɗanda ba su wanzu ba.
- Yin la'akari da tsarin a matsayin shaida. Hanya da ake ganin ta dace ba ta bada garantin cewa za a ci gaba da amsawa ba.
- Ba a tantance ma'auni ba. Abin da ke da aminci akan ma'aunin MG na iya zama haɗari akan ma'aunin kilogiram.
Hankali: Kawai saboda AI ya gabatar da shawarar da aka gabatar a matsayin "akwai a cikin wallafe-wallafen" baya nufin cewa akwai gaske. Tabbatar da dangana maɓalli matakin zuwa ingantaccen tushe (labarin DOI, sanannen hanya).
A takaice
- AI abokin haɗin gwiwa ne mai ƙarfi a cikin tsinkayar gaba da retrosynthesis; Yana tsinkayar nau'in samfurin da kyau.
- Lambobin yanayi ba su da kyau a yawan amfanin ƙasa da halayen da ba kasafai ba; tabbatar da waɗannan da wallafe-wallafen.
- Maimakon hanya ɗaya, nemi madadin 2-3 kuma sanya su alama mafi haɗari mataki.
- Bayar da halayen gefe daban kuma a bayyane; Tabbatar da reagent / masu haɓaka sunaye a cikin kasida.
- Tsarin yana hanzarta fahimta, amma ba hujja ba ce cewa amsawar za ta yi aiki.
Aikin aikace-aikace
Zaɓi kwayoyin da kuka sani. Tambayi AI don madadin hanyoyin retrosynthesis guda biyu; Tambaye shi/ta ya nuna abubuwan farawa, yanayi da mataki mafi haɗari ga kowace hanya tare da MURMUSHI. Sannan gwada tabbatar da maɓalli na kowane hanya tare da tushen wallafe-wallafe (ainihin DOI). Wace hanya ce ta fi ƙarfi? Nawa ne daga cikin sharuɗɗan da AI suka bayar sun yi daidai da wallafe-wallafen, kuma nawa ne ke buƙatar gyara? Rubuta kwatancen shafi ɗaya.
jerin abubuwan dubawa
- [ ] Na san bambanci tsakanin tsinkayar gaba da retrosynthesis.
- [ ] Na bayyana kwayoyin halitta tare da SMILES da ƙuntatawa (ma'auni, ƙarfi).
- [ ] Ba na son hanya daya tilo, ina son mafita da matakai masu hadari.
- [ ] Na bar halayen gefe a cikin wata tambaya daban.
- [ ] Na tabbatar da lambobin yanayi da sunayen reagents tare da wallafe-wallafe/ kasidar.
- [ ] Ina amfani da shi don fahimtar tsarin, ba a matsayin shaida ba.