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. Oxidation reaction of naphthalene
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. Reduction of naphthalene (Addition reaction)
Naphthalene can be added with 5 hydrogen to form Decalin.
3. Electrophilic substitution of naphthalene
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.
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.
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).
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.
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!