N,N-Dimethylformamide CAS 68-12-2
Whakataki hua
Ko te Dimethylformamide e kiia nei ko te DMF. He matū tēnei e whakakapia ana te rōpū hydroxyl o te waikawa formic e te rōpū dimethylamino, ko te tātai ngota HCON(CH3)2. He wai kore tae, mārama hoki, he nui te kohua, he kakara amine māmā, ā, ko te mātotoru whanaunga he 0.9445 (25℃). Te pūwāhi rewa -61℃. Te pūwāhi koropupū 152.8℃. Te pūwāhi mura 57.78℃. Te mātotoru kohu 2.51. Te pēhanga kohu 0.49kpa (3.7mmHg25℃). Ko te pūwāhi mura aunoa he 445℃. Ko te rohe pahūtanga o te ranunga mamaoa me te hau he 2.2~15.2%. Mēnā ka pāngia e ngā mura tuwhera me te wera nui, ka mura pea, ka pahū. Ka taea e ia te tauhohe kaha ki te waikawa whanariki kukū me te waikawa hauota paowa, ā, ka pahū anō hoki. Ka taea te whakaranu ki te wai me te nuinga o ngā whakarewa waro. He whakarewa noa mō ngā tauhohenga matū. Kāore he kakara o te dimethylformamide parakore, engari he kakara ika te dimethylformamide kounga ahumahi, kua pirau rānei, nā te mea he paru dimethylamine kei roto. I ahu mai te ingoa i te mea he whakakapinga dimethyl o te formamide (amide o te waikawa formic), ā, kei runga i te ngota N (hauota) ngā rōpū methyl e rua. Ko te Dimethylformamide he whakarewa aprotic polar (hydrophilic) me te ira kohua teitei, ka taea te whakatairanga i te tikanga tauhohenga SN2. Ka hangaia te Dimethylformamide mai i te waikawa formic me te dimethylamine. Kāore te Dimethylformamide i te pumau (ina koa i ngā pāmahana teitei) i te aroaro o ngā turanga kaha pēnei i te konutai hauwai, ngā waikawa kaha pēnei i te waikawa hauwaiora, te waikawa whanariki rānei, ā, ka waikura hei waikawa formic me te dimethylamine.
He tino pumau i te hau, ā, ina werahia kia koropupū. Ina neke ake te pāmahana i te 350°C, ka ngaro te wai, ka puta he hauota waro me te dimethylamine. He tino pai te whakarewa porotaka aprotic te N,N-dimethylformamide e taea ai te whakarewa i te nuinga o ngā matū waro me ngā matū kore-waro, ā, ka taea te whakaranu ki te wai, ngā waipiro, ngā ether, ngā aldehyde, ngā ketone, ngā esters, ngā hauwaiwaro halogenated me ngā hauwaiwaro kakara. . Ko te pito pai o te ngota ngota N,N-dimethylformamide e karapotia ana e ngā rōpū methyl, e hanga ana i tētahi arai ā-wāhi e ārai ana i ngā katote kino mai i te whakatata mai, ā, ka hono noa i ngā katote pai. He nui ake te kaha o ngā anion tahanga i ngā anion kua whakarewahia. He māmā ake te mahi i ngā tauhohenga ionic maha i roto i te N,N-dimethylformamide i ngā whakarewa protic whānui. Hei tauira, ka tauhohe ngā carboxylates me ngā hauwaiwaro halogenated i roto i te N,N-dimethylformamide i te pāmahana rūma. , ka taea te whakaputa i ngā esters me ngā hua teitei, ā, he tino pai mō te hanga i ngā esters aukati-sterically.
Mara tono
He wai mārama, kore tae te Dimethylformamide. Ehara i te mea he rauemi matū whānuitia anake, engari he whakarewa pai hoki me te whānuitanga o ngā whakamahinga. He rauemi mata nui te Dimethylformamide i roto i ngā ahumahi rongoā, hinu matū, hiako me ētahi atu ahumahi.
Whakaahuatanga hanga
N,N-Dimethylformamide
CAS 68-12-2
Nama CBN: CB2854115
Tātai ngota: C3H7NO
Taumaha ngota 73.09
Te pūwāhi rewa: -61°C (iritihia)
Hurihanga motuhake: 0.94º
Te pāmahana koropupū: 153°C (iritihia)
Kiato: 0.944g/mL (rita) V
Te mātotoru o te kohu apor Chemicalbook: 2.5 (vsair)
Pēhanga kohu: 2.7mmHg (20°C) Taupū whakaata: n20/D1.430(rita)
Pūwāhi mura: 136°
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