Dimethyl carbonate CAS: 616-38-6
Dimethyl carbonate (DMC), zinthu zopangira mankhwala zokhala ndi kawopsedwe kochepa, chitetezo chabwino kwambiri choteteza chilengedwe komanso kugwiritsa ntchito kwambiri, ndizofunikira zapakatikati pakupanga organic.Mapangidwe ake a maselo ali ndi magulu ogwira ntchito monga carbonyl, methyl ndi methoxy, ndipo ali ndi machitidwe osiyanasiyana.Ili ndi mawonekedwe otetezeka, osavuta, odetsedwa pang'ono komanso mayendedwe osavuta popanga.Dimethyl carbonate ndi mankhwala "obiriwira" odalirika chifukwa cha kawopsedwe kakang'ono.
Mapangidwe a maselo: C3H6O3;(CH3O)2CO ;CH3O-COOCH3
Molecular kulemera: 90.07
Chiwerengero cha 616-38-6
Nambala ya EINECS: 210-478-4
Kugwiritsiridwa ntchito kwachilengedwe Makhalidwe abwino kwambiri ndi mawonekedwe apadera a mamolekyu a DMC amatsimikizira kugwiritsa ntchito kwake, komwe kungathe kufotokozedwa mwachidule motere:
Bwezerani phosgene yopindidwa ngati carbonylation agent.
Ngakhale phosgene (Cl-CO-Cl) imakhala ndi reactivity yapamwamba, zopangira zake zapoizoni kwambiri komanso zowononga zimapangitsa kuti ikumane ndi zovuta zachilengedwe, motero imachotsedwa pang'onopang'ono.DMC(CH3O-CO-OCH3) ili ndi nucleophilic reaction center.Gulu la carbonyl la DMC likagwidwa ndi ma nucleophiles, mgwirizano wa acyl-oksijeni umasweka kuti apange mankhwala a carbonyl, ndipo mankhwala ake ndi methanol.Choncho, DMC akhoza m'malo phosgene monga reagent otetezeka anachita kupanga zotumphukira carbonic asidi, monga mankhwala carbamate, polycarbonates, isocyanates, etc., amene polycarbonate adzakhala munda ndi kufunika yaikulu kwa DMC.Zinanenedweratu kuti mu 2005.
Bwezerani dimethyl sulfate yopindidwa ngati methylating agent.
Pazifukwa zofanana ndi phosgene, dimethyl sulfate (CH3O-SO-OCH3) ikukumananso ndi vuto la kuthetsa.Pamene methyl carbon ya DMC igwidwa ndi ma nucleophiles, mgwirizano wake wa alkyl-oxygen umasweka ndipo mankhwala a methylated amapangidwanso.Komanso, zomwe zokolola za DMC ndizokwera kwambiri ndipo njira yake ndi yosavuta kuposa ya dimethyl sulfate.Zomwe zimagwiritsidwa ntchito kwambiri zimaphatikizapo kupanga organic intermediates, mankhwala, mankhwala ophera tizilombo, etc.
