A new sesquiterpene, 12,13-di-acetoxyl-1,4,6,11-eudesmanetetrol 1, was isolated from Michelia yunnanensis. The structure was elucidated on the basis of spectral data.
A new benzofuranosesquiterpene dimer, named virgaurin B, has been isolated from the roots of Ligularia virgaurea and its structure has been elucidated by spectroscopic evidence.
THE ZnO powder （micro-crystallites）, an important functional material, has a wide applica-tion in the fields of ceramics, coatings and electronic devices. However, the powder, usuallyobtained by calcination of zinc ...THE ZnO powder （micro-crystallites）, an important functional material, has a wide applica-tion in the fields of ceramics, coatings and electronic devices. However, the powder, usuallyobtained by calcination of zinc oxalate, has a wide particle-size distribution and poor sinteringactivities so various methods for its preparation have been developed. The hydrothermalmethod is widely used to prepare many superfine powders such as ZrO<sub>2</sub>, BaTiO<sub>3</sub>, PLZT, dueto many advantages compared with other methods. Recently, the powder of Ⅱ—Ⅵ com-pounds can also be prepared by this method. Furthermore, crystallite shapes may be consid-展开更多
文摘A new sesquiterpene, 12,13-di-acetoxyl-1,4,6,11-eudesmanetetrol 1, was isolated from Michelia yunnanensis. The structure was elucidated on the basis of spectral data.
文摘A new benzofuranosesquiterpene dimer, named virgaurin B, has been isolated from the roots of Ligularia virgaurea and its structure has been elucidated by spectroscopic evidence.
文摘THE ZnO powder （micro-crystallites）, an important functional material, has a wide applica-tion in the fields of ceramics, coatings and electronic devices. However, the powder, usuallyobtained by calcination of zinc oxalate, has a wide particle-size distribution and poor sinteringactivities so various methods for its preparation have been developed. The hydrothermalmethod is widely used to prepare many superfine powders such as ZrO<sub>2</sub>, BaTiO<sub>3</sub>, PLZT, dueto many advantages compared with other methods. Recently, the powder of Ⅱ—Ⅵ com-pounds can also be prepared by this method. Furthermore, crystallite shapes may be consid-
