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Fluorinated compounds can exhibit interesting biological properties. The importance of these species has made that the chemistry of fluorine has experienced a great development. On this review, the recent advances on asymmetric fluorination reactions promoted by chiral hydrogen‐bonding‐based organocatalysts are discussed. Hence, examples using phosphoric acid, carboxylic acid, (thio)urea and squaramide derivatives are illustrated. The growth of this field is amazing. We have only considered pivotal works in which direct fluorination takes place using a fluorinating agent, leaving aside the reactions where a fluorine atom is incorporated from the beginning as part of other reactants. Herein, the scarce existing examples on this field of rese.
9月7日,四川省巴中市通江县村民们在丰收后晒秋。 程 聪摄(人民视觉). “秋分不生田,处处动刀镰。”又到一年丰收季,乌江之畔翻滚着金色稻浪。贵州省毕节市黔西县洪水镇解放村的代远付趁着天气晴好,收割了自家10多亩的水稻。. “你看这优质红米稻,籽粒多饱满。”剥开一粒金黄的稻谷,老代笑了,“今年虽然受到疫情、洪涝和病虫害的影响,但每亩产量还是有1000斤左右,收成相当不错。”. 大江南北,到处是秋收景象,让人看着就高兴。. “前两季的夏粮和早稻已丰收到手,分别比上年增产24.2亿斤、20.6亿斤,夏粮产量创历史新高,秋粮面积预计比上年增加800万亩,丰收在望。”农业农村部部长韩长赋说,今年还是一个丰收年,粮食会有个好收成。. 手中有粮,心中不慌。中国始终高度重视粮食安全,把14亿人的吃饭问题作为头等大事来抓。“十三五”期间,严守18亿亩耕地红线,加大粮食生产政策支持力度,粮食连年丰收,产量持续稳定在1.3万亿斤以上。2019年,中国粮食产量刷新历史纪录,达到13277亿斤;人均粮食占有量超470公斤,持续高于世界平均水平。. 在山东省德州市临邑县德平镇,魏德东盯着地里一株株挺直了粗壮“腰杆”的玉米,喜得合不拢嘴:“今年又扩种了200多亩,长势很好!”魏德东每天都要到他的2000多亩富民农场转转,“10月中旬准备收了,估摸着每亩产量能到650公斤左右,比去年又高了些。”. “中国用全球9%的耕地和6%的淡水资源满足了占全球近20%人口的粮食需求,这是非常了不起的伟大成就。”联合国粮农组织总干事屈冬玉称赞道。. 丰收的背后,是5年来中国粮食综合生产能力的提升,是农业科技的强劲支撑。. 在安徽省涡阳县,收割机轰鸣前行,一簇簇玉米被农机吃进“肚子”,摘穗剥皮,金黄籽粒倾泻而出。“卫星‘指路’,农机无人驾.

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