萘（naphthalene），是簡單的稠環(huán)芳烴，化學(xué)式為C10H8，是由2個(gè)苯環(huán)共用2個(gè)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(qū)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(yīng)

1. Oxidation reaction of naphthalene

溫和氧化劑得醌，強(qiáng)烈氧化劑得酸酐。萘環(huán)比側(cè)鏈更易氧化，所以不能用側(cè)鏈氧化法制萘甲酸。電子云密度高的環(huán)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(huán)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(yīng)（加成反應(yīng)）

2. Reduction of naphthalene (Addition reaction)

萘可與5個(gè)氫氣加成生成十氫化萘。

Naphthalene can be added with 5 hydrogen to form Decalin.

3、萘的親電取代反應(yīng)

3. Electrophilic substitution of naphthalene

萘的α-位比β-位更易發(fā)生親電取代反應(yīng)。α-位取代兩個(gè)共振式都有完整的苯環(huán)。β-位取代只有一個(gè)共振式有完整的苯環(huán)。

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(huán)上主要發(fā)生親電取代，同苯環(huán)一樣（易取代，難加成），但活性比苯環(huán)強(qiáng)。

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(gè)C旁邊的C開始標(biāo)（中間的兩個(gè)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(zhì)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(dòng)力學(xué)控制，溫度較高時(shí)，α碳上取代基會(huì)轉(zhuǎn)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-克來福特酰基化反應(yīng)，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(chǎn)物。還有怎樣的疑惑或者需求，隨時(shí)來我們網(wǎng)站http://www.456nba.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.456nba.com Consultation and understanding!