Sulfuric acid immobilized on silica gel is designed as a very useful catalyst for synthesis of 2,3-unsaturated glycopyranosides. This handy,metal-free,environment friendly transformation provides high yields andα-ste...Sulfuric acid immobilized on silica gel is designed as a very useful catalyst for synthesis of 2,3-unsaturated glycopyranosides. This handy,metal-free,environment friendly transformation provides high yields andα-stereoselectivities in a very few amount (0.02 eq.) of catalyst and in short reaction times(10 min).展开更多
阿道夫·费里埃尔是瑞士教育家,曾被联合国教科文组织国际教育局(International Bureau of Education,IBE)列为100位最著名的教育家之一①。他为欧洲“新教育运动”作出了重要贡献,可谓是这一运动的推动者和宣传员。费里埃尔一生笔...阿道夫·费里埃尔是瑞士教育家,曾被联合国教科文组织国际教育局(International Bureau of Education,IBE)列为100位最著名的教育家之一①。他为欧洲“新教育运动”作出了重要贡献,可谓是这一运动的推动者和宣传员。费里埃尔一生笔耕不辍,为向大众宣传新教育思想写下了许多著作。本文在回顾费里埃尔的成长经历及重要教育实践之后,以“活动学校”为中心,对费里埃尔教育思想的历史渊源、心理学基础、教学实施等几个方面进行了探讨。展开更多
基金The project was supported by Shanghai Rising-Star Program(No.06QA14018)University Students Innovative Activities Project of Shanghai Municipal Education Commission(No.KY2008-09S)
文摘Sulfuric acid immobilized on silica gel is designed as a very useful catalyst for synthesis of 2,3-unsaturated glycopyranosides. This handy,metal-free,environment friendly transformation provides high yields andα-stereoselectivities in a very few amount (0.02 eq.) of catalyst and in short reaction times(10 min).
文摘阿道夫·费里埃尔是瑞士教育家,曾被联合国教科文组织国际教育局(International Bureau of Education,IBE)列为100位最著名的教育家之一①。他为欧洲“新教育运动”作出了重要贡献,可谓是这一运动的推动者和宣传员。费里埃尔一生笔耕不辍,为向大众宣传新教育思想写下了许多著作。本文在回顾费里埃尔的成长经历及重要教育实践之后,以“活动学校”为中心,对费里埃尔教育思想的历史渊源、心理学基础、教学实施等几个方面进行了探讨。