Medicine intermediate N - ethylethylenediamine ( NEED ) was synthesized from acrylamide and ethylamine by addition reaction and Hofmann rearrangement.以丙烯酰胺为起始原料,经乙胺加成后,再经Hofmann重排两步反应后合成了药物中间体N - 乙基乙二胺 ( NEED )....
目的: 合成新的双-胡椒醛缩二胺类席夫碱化合物.Methods: Five Schiff bases were prepared from piperonal and diamines by condensation reaction.用胡椒醛为起始原料,经氯化 、 水解、缩合,制得血凝酸胺.After the process of chlorination, hydrolytic decomposition and condensat...
The walls had been painted an eggshell white.墙面用蛋壳漆刷成了白色。The processing of calcium acetate from eggshell was studied.以鸡蛋壳为原料,研究制备醋酸钙的工艺技术.Over time, the protein in the eggshell breaks down into its constituent amino acid...
May you, Diomed, combine the viands as well as the architecture!狄俄墨德,但愿你把美味的菜肴和建筑学结合在一起!The family sat down to table, and a frugal meal of cold viands was deposited beforethem.一家老少,都围着桌子坐下.几样简单的冷食, 摆在他们面前....
Lowell , who succeeded him in the chair , also merited the appointment.接替他出任这个教职的洛威尔也极其称职.Longfellow, Lowell, Holmes: all three, great men to their own age, have dwindled subsequently.朗费罗 、 洛威尔 、 霍姆斯三个, 都不失为他们那个时代的伟人, 后来...