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However, when extending these strategies to simple arenes such as substituted benzenes, a mixture of regioisomers (ortho-/meta-/para-, and/or benzylic position) is obtained (Fig. 1a, bottom)22,23,24. Moreover, these reactions require a large excess of arenes due to the low reactivity of...
英文: para: paraplegia,中文: 截瘫。英文: Even the Hong Kong movie industry has jumped on the bandwagon with Para Para Sakura.中文: 甚至香港电影业也因拍摄《啪啦啪啦樱之花》而对啪啦啪啦舞青眼有加。英文: Studies on ortho-hydroxylation aerobic biodegration of fluorophenols中文: 氟苯酚好氧生物降解...
In one pattern,ortho-andpara– products dominate, and themeta-product is an extremely minor byproduct. Substituents which lead to this result are called, “ortho-,para-directors”. Examples of ortho-,para– directors are hydroxyl groups, ethers, amines, alkyl groups, thiols, and ...
para n. 1.【口】帕拉胶 Ⅱ para 二产妇 PARA =Perceiving and Recognition Automation 探测与辨认自动装置 torpedo directing sight 鱼雷瞄准具 self directing [ self-direction ]的相关形容词 ortho 表示“直, 正直”之义 Para. 【缩写】 =Paraguay group n.[C] 1.组,群,批,类,簇 2.集团 v.[I] 1....
Larrosa, Overriding ortho-para selectivity via a traceless directing group relay strategy: The meta-selective arylation of phenols. J. Am. Chem. Soc. 136, 4109-4112 (2014).Overriding Ortho-Para Selectivity via a Traceless Directing Group Relay Strategy:The Meta-Selective Arylation of Phenols. Luo...
网络释义 1. 邻对位定位基 biochemistry terms - 豆丁网 ... Orinentation 取向Ortho-para directing group邻对位定位基Meta directing group 间位定位基 ... www.docin.com|基于10个网页 2. 邻对位定向基团 化学科 ... orthoboric acid <原>硼酸ortho-para directing group邻对位定向基团ortho-para orientatin...
- Due to the resonance effect, the charge density increases at the ortho and para positions compared to the meta position. This means that the ortho and para positions are more favorable for electrophilic attack. 6. Directing Effect: - Despite the overall deactivation of the benzene ring due ...
Maleczka R E,Shi F,Holmes D,et al.C—H activation/bory lation/oxidation a one-pot unified route to meta-substituted phenols bearing ortho-para-directing groups[J].Journal of the American Chemical Society,2003,125(26):7792-7793.Maleczka R E, Shi F, Holmes D , et a l. C - H ...
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