Lg Life Sciences, Limited

Lg Chem, Ltd

Yeong-Dae Kim

Jae Sung Lee

Hyun Kil Nam

Gyo-Hyun Hwang

Hyun-Ik Shin

Jay-Hyok Chang

Young-Keun Kim

Kyung Hee Lee

Sang-Soon Choi

Jeong-Kyu Kim

Hyun-Kuk Noh

Sang-Yun Jung

Kyung-Hee Lee

Jae-Sung Lee

The present invention relates to a method for preparing cerium carbonate that can improve yield and productivity of cerium carbonate, cerium carbonate powder, and a method for preparing cerium oxide using the same. The method for preparing cerium carbonate comprises the steps of mixing a cerium precursor and urea; and, elevating the temperature of the mixture to 50&#x2dc;250&#xb0; C. under solvent free condition to react the cerium precursor and urea.

Method for preparing cerium carbonate and method for preparing cerium oxide powder

The present invention relates to a process for the preparation of 4-aminomethyl-3-alkoxyiminopyrrolidine methanesulfonate, a key intermediate of quinolone antibiotics. According to the process of the present invention, the total number of steps has been shortened to 2-3 steps, the solid separation is not required, and the use of costly chemicals, particularly (BOC)O (t-butoxycarbonyl anhydride), several organic solvents and reactants, is eliminated.

Process for preparing 4-aminomethyl-3-alkoxyiminopyrrolidine methanesulfonate

The present invention relates to a process for the preparation of 4-aminomethyl-3-alkoxyiminopyrrolidine methane-sulfonate, a key intermediate of quinolone antibiotics. According to the process of the present invention, the total number of steps has been shortened to 2-3 steps, the solid separation is not required, and the use of costly chemicals, particularly (BOC)O (t-butoxycarbonyl anhydride), several organic solvents and reactants, is eliminated.

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Daejeon, South Korea

Yeong-Dae Kim