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萘的化學性質從幾個方面表現

來源:http://www.chadtoddband.com/ 日期:2023-06-27 發布人:guanli
萘(naphthalene),是簡單的稠環芳烴,化學式為C10H8,是由2個苯環共用2個相鄰碳原子稠合而成,廣泛用作制備染料、樹脂、溶劑等的原料,也用作驅蟲劑。下面精萘廠家為您分析:
Naphthene, a simple polycyclic aromatic hydrocarbon with the chemical formula C10H8, is formed by the fusion of two adjacent carbon atoms shared by two benzene rings. It is widely used as a raw material for the preparation of dyes, resins, solvents, and other insecticides. The following refined naphthalene manufacturers will analyze for you:
1、萘的氧化反應
1. Oxidation reaction of naphthalene
溫和氧化劑得醌,強烈氧化劑得酸酐。萘環比側鏈更易氧化,所以不能用側鏈氧化法制萘甲酸。電子云密度高的環易被氧化。例如α-硝基萘氧化得3-硝基鄰苯二甲酸酐,α-萘胺氧化得鄰苯二甲酸酐(氨基所在的環被氧化)。
A mild oxidant yields quinone, while a strong oxidant yields anhydride. Naphthalene rings are more easily oxidized than side chains, so side chain oxidation cannot be used to produce naphthoic acid. The rings with high density of Electron cloud are easy to be oxidized. for example α- Nitro naphthalene is oxidized to 3-nitro Phthalic anhydride, α- Naphthylamine is oxidized to Phthalic anhydride (the ring of amino group is oxidized).
2、萘的還原反應(加成反應)
2. Reduction of naphthalene (Addition reaction)
萘可與5個氫氣加成生成十氫化萘。
Naphthalene can be added with 5 hydrogen to form Decalin.
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3、萘的親電取代反應
3. Electrophilic substitution of naphthalene
萘的α-位比β-位更易發生親電取代反應。α-位取代兩個共振式都有完整的苯環。β-位取代只有一個共振式有完整的苯環。
Naphthalene α- Bitwise ratio β- The Electrophilic substitution is more likely to occur in the. α- Both resonance formulas have a complete benzene ring. β- There is only one resonance formula with a complete benzene ring in place of a substitution.
在萘環上主要發生親電取代,同苯環一樣(易取代,難加成),但活性比苯環強。
The electrophilic substitution mainly occurs on the naphthalene ring, similar to the benzene ring (easy to replace, difficult to add), but with stronger activity than the benzene ring.
從中間對稱的兩個C旁邊的C開始標(中間的兩個碳不編號),其中1,4,5,8號碳活性完全一樣(稱為α碳),2,3,6,7號碳性質完全一樣(稱為β碳)。
Starting from the C next to the symmetrical two Cs in the middle (the two carbons in the middle are not numbered), where the activity of carbons 1, 4, 5, and 8 is exactly the same (referred to as α Carbon), carbon numbers 2, 3, 6, and 7 have identical properties (referred to as β Carbon).
一般情況下,α碳活性大于β碳,取代基在α位上,這是由動力學控制,溫度較高時,α碳上取代基會轉移到β碳上。
In general, α Carbon activity greater than β Carbon, substituent in α In terms of position, this is controlled by dynamics. When the temperature is high, α The substituents on carbon will transfer to β On carbon.
但在萘的弗瑞德-克來福特?;磻?,不加熱卻生成了α位和β位的混合物。如用硝基甲烷為溶劑,則主要生成β?;a物。還有怎樣的疑惑或者需求,隨時來我們網站http://www.chadtoddband.com咨詢了解!
But in the Friedel-Crafterford acylation reaction of naphthalene, it was generated without heating α Bitwise sum β A mixture of bits. If Nitromethane is used as solvent, it mainly generates β Acylation products. Feel free to come to our website for any further doubts or needs http://www.chadtoddband.com Consultation and understanding!
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