University Distinguished Professorshttps://hdl.handle.net/10365/320822024-03-29T10:31:38Z2024-03-29T10:31:38ZSynthesis of Precursors to Non-isocyanate PolyurethanesWei, Manqinghttps://hdl.handle.net/10365/291672023-08-08T04:12:49Z2018-01-01T00:00:00ZSynthesis of Precursors to Non-isocyanate Polyurethanes
Wei, Manqing
Biobased diamines are excellent precursors for the synthesis of non-isocyanate polyurethanes (NIPUs). We have prepared several biobased diamines using three different reactions for their synthesis. In the first method, we have carried out chain elongation of cellulose-derived 2,5-diformylfuran by the Henry reaction followed by reduction of the nitroalkene. Yields of the key step: Hantzsch Ester reduction, were 70-80%. Method two involves the Friedel-Crafts alkylation of furfurylamine with different ketones under acidic conditions. Yields of large-scale alkylation reaction were 60-77%. In method three, we combined the Henry reaction and Friedel-Crafts alkylation techniques to access diamines from hemicellulose-derived furfural. These diamines can be reacted with carbonates to access hydroxyalkylcarbamates in good yields, around 80%. We have also developed a novel method for accessing biscarbamates directly from dialdehydes in good yields, 70-94%. The hydroxyalkylcarbamates and biscarbamates are valuable precursors to obtain polyurethanes via the phosgene-free route.
2018-01-01T00:00:00ZWell-trained Swedish Midwife. Plate from von Horn, 1697https://hdl.handle.net/10365/291612021-09-17T20:09:15Z1697-01-01T00:00:00ZWell-trained Swedish Midwife. Plate from von Horn, 1697
Originally published in Den swenska wal-ofwade jord-gumman hwilken grundeligen underwijser huru med en hafwande handlas, en wandande hielpas, en barna-qwinna handteras, och det nyfodda barnet skiotas skal. Mast effter egen Forfarenhet, jemte wal- ofwade personers Skriffer, all Lakare och Feldschere; men sardeles Barnmoderskor och Huus-Modrar til Gagn och Nytta, med tienliga fi gurer forfattat ... pa egen bekostning utgifwin. Stockholm, Tryckt uti Nathanael Goldenaus Tryckerij, 1697.; These images were taken while preparing a book (Wombs with a View, Springer, 2016) on the history of the illustrations and how they contributed to our understanding of anatomy and physiology of pregnancy, thereby enabling advances in the practice of obstetrics and gynecology.
1697-01-01T00:00:00ZWell-trained Swedish Midwife. Plate from von Horn, 1697, of Birth Chairhttps://hdl.handle.net/10365/291602021-09-17T20:09:15Z1697-01-01T00:00:00ZWell-trained Swedish Midwife. Plate from von Horn, 1697, of Birth Chair
Originally published in Den swenska wal-ofwade jord-gumman hwilken grundeligen underwijser huru med en hafwande handlas, en wandande hielpas, en barna-qwinna handteras, och det nyfodda barnet skiotas skal. Mast effter egen Forfarenhet, jemte wal- ofwade personers Skriffer, all Lakare och Feldschere; men sardeles Barnmoderskor och Huus-Modrar til Gagn och Nytta, med tienliga fi gurer forfattat ... pa egen bekostning utgifwin. Stockholm, Tryckt uti Nathanael Goldenaus Tryckerij, 1697.; These images were taken while preparing a book (Wombs with a View, Springer, 2016) on the history of the illustrations and how they contributed to our understanding of anatomy and physiology of pregnancy, thereby enabling advances in the practice of obstetrics and gynecology.
1697-01-01T00:00:00ZWell-trained Swedish Midwife. Plate from von Horn, 1697, of Female Reproductive Tracthttps://hdl.handle.net/10365/291592021-09-17T20:09:15Z1697-01-01T00:00:00ZWell-trained Swedish Midwife. Plate from von Horn, 1697, of Female Reproductive Tract
Originally published in Den swenska wal-ofwade jord-gumman hwilken grundeligen underwijser huru med en hafwande handlas, en wandande hielpas, en barna-qwinna handteras, och det nyfodda barnet skiotas skal. Mast effter egen Forfarenhet, jemte wal- ofwade personers Skriffer, all Lakare och Feldschere; men sardeles Barnmoderskor och Huus-Modrar til Gagn och Nytta, med tienliga fi gurer forfattat ... pa egen bekostning utgifwin. Stockholm, Tryckt uti Nathanael Goldenaus Tryckerij, 1697.; These images were taken while preparing a book (Wombs with a View, Springer, 2016) on the history of the illustrations and how they contributed to our understanding of anatomy and physiology of pregnancy, thereby enabling advances in the practice of obstetrics and gynecology.
1697-01-01T00:00:00Z