This paper describes the first case of a reductive coupling reaction with indene,a non-heteroatom olefin used as a reducing agent.The scope of the substrate is wide.The homo-coupling,cross-coupling,and synthesis of 12 and 14-membered rings were realized.T
在以人工智能、5G、云计算、大数据、区块链等新技术为代表的信息化浪潮大发展的背景下,作为上海国资委下属唯一一家以产业园区投资、开发与经营和园区相关配套服务为主业的
基于欧空局CryoSat和Envisat任务的冰厚数据以及新的雪模型的研究表明,北极沿海地区海冰变薄的速度可能是想象的两倍。新闻中经常提到,地球上不断减少的冰层无疑是气候变化的最大受害者之一。然而,计算我们正在失去的冰量则是一个挑战。虽然使用卫星遥感技术来监测被冰覆盖的陆地和海洋区域相对简单,但科学家需要了解实际体积是如何变化的——为了计算这一点,他们需要测量冰的厚度。ESA的CryoSat高度计
Two chelating guanidinate-based dysprosium(Ⅲ)complexes,namely the monomeric{(Me3Si)2NC(NiPr)2}2Dy(μ-CI)2Li(THF)2 1 and the dimeric[{(Me3Si)2NC(Ni
A catalytic two-component three-centered(2C3C)Ugi-type reaction was developed for the synthesis of L-1-deoxynojirimycin(DNJ)isomers using a chiron approach.This new and quite mild catalytic system,comprised of phenylphosphinic acid/Nal,was used to synthes
时光回到上海开埠以后的1849年,法租界开辟。徐家汇位于法租界内,得名于明代科学家、大学士徐光启的家族。徐虽在京城做官,但其子孙都定居于上海县城西门外十余里——法华泾和肇嘉滨汇流处,即"徐家汇"。徐光启生前与传教士来往甚密,有了这层关系,徐家汇自然成为天主教法国耶稣会在华活动的中心。各种教会机构如教堂、主教府、修道院、天文台、印刷所、藏书楼、男女中学等等形成规模庞大的教会区。1872年 (同治十一
人工智能教父辛顿曾经说过:人也是机器,一台绝妙的机器。这句话的本意是回应某些"人工智能威胁论"的论断,但也同时暗示了人工智能所追求的终极目标,即是让机器像人一样进行思考与工作。从上世纪五十年代达特茅斯会议之后,人工智能走进人们视野,到如今特征自动提取网络如雨后春笋一般被提出和应用,不论科技的进步是否真正实现"人工智能" (像人一样思考和工作),但谁都不可否认当下我们已经迈入了人工智能工业化的时代,
Main observation and conclusionrnIn searching for novel fungicidal leads,a series of pyrazole-containing strobilurins were rationally designed,synthesized and c
Main observation and conclusionrnHigh-performance,cost-effective hole-transport materials(HTMs)are greatly desired for the commercialization of perovskite solar
Main observation and conclusionrnInflammation is a complex biological response to stimulation.Natural cassane diterpenoids from Caesalpinia genus exhibit signif