摘要:
The present invention relates to new chiral salen catalysts and methods for the preparation of chiral compounds from racemic epoxides by using new catalyst. More particularly, the present invention is to provide novel chiral salen catalysts and their uses for producing chiral compounds having high optical purity to be used as raw materials for preparing chiral medicines or food additives in a large scale economically, wherein the chirl salen catalyst having a particular molecules structure can be reused continuously without any activating process of used catalysts and cause no or little racemization after the reaction is completed because it maintains its catalytic activity after the reaction process.
摘要:
The present invention relates to a method for fabricating a functional dental element, such as a crown. According to the invention, use is made of a three-dimensional printing technique. The major advantages of the invention are that no mold is needed anymore, which entails a considerable saving of costs, that a great accuracy is achieved, and that the element can be made of different materials.
摘要:
The present invention relates to cinnamaldehyde derivatives inhibiting growth of tumor cell and regulating cell cycle, the method for preparation and the pharmaceutical composition thereof. The cinnamaldehyde derivatives of the present invention can be effectively used as a cell cycle regulator or a cancer cell growth inhibitor, since it has an ability to regulate cell cycle by holding the cells in G2/M stage of the cell division and has activity to inhibit cancer cell growth.