搜索到3139篇“ SP2“的相关文章
sp2-N/sp3-N螯合的铱铑钌配合物的合成及抗癌活性研究
化疗一直是肿瘤临床治疗的主要方法之一。虽然铂类抗癌药物包括顺铂、卡铂和奥沙利铂在不同肿瘤的治疗中取得了巨大成功,但是它们也具有缺乏对癌细胞与正常细胞之间的选择性、严重的毒副作用和耐药性等诸多缺陷。这促使人们进一步设计和合...
李鹏伟
Importance of V^(4)and optimal acid environment in the hydroxylation of inert benzene via activation of C_(sp2)-H bond
2024年
Hydroxylation of inert benzene through the activation of the C_(sp2)-H bond is a representative reaction about the transformation of C-H bonds to C-O bonds,which has far-reaching guiding significance but remains a challenging scientific problem.To overcome this problem,a series of VOx-Ga_(2)O_(3)/SiO_(2)-Al_(2)O_(3)were prepared to achieve an efficient and economical hydroxylation path of benzene to phenol.The results showed that the phenol yield was 72.89%(selectivity>98.1%)under the optimum conditions.The reason is that the C-H bond in the benzene ring is activated by heterolysis over a VOx-Ga_(2)O_(3)/SiO_(2)-Al_(2)O_(3)catalyst.Meanwhile,the introduction of aluminum(Al)and gallium(Ga)made a qualitative change in the catalyst,enhancing the electron motion and spin motion of vanadium species,resulting in the increase of V4^(+)/V5^(+)ratio.In addition,the catalyst can provide an optimal acidic environment and a threedimensional cross-linked surface structure that facilitates product diffusion.
Peng DongYang XinYanwei LiXiaohui ZhangXiaorui WangYu ZhaoDongqiang ZhangHaowen MaGuixian Li
航天诱变地梢瓜SP1-SP2代优良植株的选育
徐倩倩
串联-重排策略构建C(sp2)-P/C(sp3)-P键反应研究
史崇浩
基于光、电化学碳卤键断裂实现C(sp2)-C(sp3)键的构建及肟的合成
蓝金平
Solvent-controlled stereodivergent synthesis of E-and Z-enamines via metal-free formal C(sp2)-H amination ofα-substituted styrenes
2024年
C(sp2)-H amination represents an attractive approach for the synthesis of enamines,which is intrinsically associated with the challenge of controlling of stereochemistry and primarily relying on transition-metal catalysis.Herein,a metal-free C(sp2)-H amination ofα-substituted styrenes has been achieved,leading to stereodivergent formation of both E-and Z-enamines in 50%–97%yield under mild conditions by using PhI(OAc)2 as a green oxidant and ortho-phenylenediamines as nitrogen source.Interestingly,the Z/E selectivity can be controlled readily by switching the reaction medium.E-isomers were formed preferentially in THF,whereas n-hexane favored the formation of Z-isomers.Preliminary mechanistic studies suggested that in situ formed ortho-benzoquinone diimides are the key intermediates,and there is a correlation between solvent polarity and stereoselectivity.This study enriches the chemical repertoire of ortho-benzoquinone diimides particularly with respect to sustainable amination.
Dangui WangJinbei YaoWentao ZhangShuyue ZhangHuaibin YuLaihu PengWeijun YaoZhifeng DaiGuojiao WuFangrui Zhong
关键词:ENAMINESMETAL-FREE
滤网(SP2
1.本外观设计产品的名称:滤网(SP2)。;2.本外观设计产品的用途:用于水下清洁机器人的过滤装置。;3.本外观设计产品的设计要点:在于形状。;4.最能表明设计要点的图片或照片:立体图。
王可可尚建武马海达李昆
氮杂环卡宾-席夫碱型C<Sub>sp2</Sub>^N<Sub>sp2</Sub>二齿环钯配合物及其合成方法与应用
本发明属于金属有机配合物的合成技术领域,具体涉及一种氮杂环卡宾‑席夫碱型C<Sub>sp2</Sub>^N<Sub>sp2</Sub>二齿环钯配合物及其合成方法与应用。这类配合物由苄胺或取代苄胺在醋酸钯存在条件下,于空气...
滕巧巧 刘微孟启 宋浩滨蒋卫华 靳浩缪春宝
镜头(LLLRigid-SP2)
1.本外观设计产品的名称:镜头(LLLRigid‑SP2)。;2.本外观设计产品的用途:用于摄影。;3.本外观设计产品的设计要点:在于形状。;4.最能表明设计要点的图片或照片:主视图。
蒲少佳周江斌辛志华
投影机(SP2)
1.本外观设计产品的名称:投影机(SP2)。;2.本外观设计产品的用途:用于家庭娱乐投影。;3.本外观设计产品的设计要点:在于形状。;4.最能表明设计要点的图片或照片:立体图。
李新强

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