Ukwenziwa kweAlkyl polyglycoside carbonates

I-Alkyl polyglycoside carbonates yalungiswa nge-transesterification ye-alkyl monoglycosides kunye ne-diethyl carbonate (Umfanekiso 4). Ngomdla wokuxutywa ngokucokisekileyo kwe-reactants, kubonakalise ukuba luncedo ukusebenzisa i-diethyl carbonate ngokugqithisileyo ukuze isebenze njengenxalenye ye-transesterification kunye ne-solvent. I-2Mole-% yesisombululo se-sodium hydroxide ye-50% yongezwa kwi-dropwise kulo mxube ngokuvuselela malunga ne-120 ℃. Emva kwe-3hours phantsi kwe-reflux, umxube wokuphendula uvumelekile ukuba uphole kwi-80 ℃ kwaye ungathathi hlangothi nge-85% ye-phosphoric acid. I-diethyl carbonate egqithisileyo ichithwa kwi-vacuo. Phantsi kwezi meko zokusabela, elinye iqela le-hydroxyl likhethwa ukuba libe ne-esterified. Umlinganiselo we-educt eseleyo kwiimveliso kwi-1: 2.5: 1(monoglycoside: Monocarbonate:Polycarbonate).

Ngaphandle kwe-monocarbonate, iimveliso ezinomgangatho ophezulu wokutshintshwa nazo zenziwe kule mpendulo. Iqondo lokongeza i-carbonate linokulawulwa ngolawulo lwezakhono zokusabela. Kuba C₁₂ i-monoglycoside, ukuhanjiswa kwe-mono-, di- kunye ne-tricarbonate ye-7: 3: 1 ifunyenwe phantsi kweemeko zokusabela ezichazwe (Umfanekiso 5). Ukuba ixesha lokuphendula linyuswe ukuya kwii-7hours kwaye ukuba i-2moles ye-ethanol ikhutshwe ngelo xesha, imveliso ephambili yi-C.₁₂ monoglycoside dicarbonate. Ukuba yonyuswa ukuya kwi-10hours kunye ne-3moles ye-ethanol i-distilled off, imveliso ephambili ekugqibeleni ifunyenwe yi-tricarbonate. Iqondo lokongeza i-carbonate kwaye ngenxa yoko ibhalansi ye-hydrophilic / lipophilic ye-alkyl polyglycoside ikhompawundi inokulungelelaniswa lula ngokuguquguquka kwexesha lokuphendula kunye nomthamo we-distillate.