Sabtu, 06 Oktober 2012
essential aromatic compounds
Characteristics of aromatic compounds
1. A delocalized conjugated π system, most commonly an arrangement of alternating single and double bonds
2. Coplanar structure, with all the contributing atoms in the same plane
3. Contributing atoms arranged in one or more rings
Aromatic hydrocarbons are a special class of cyclic compounds that are usually described as a ring of six with a single bond and a double bond bersilih changed. The group is classified separately from acyclic and aliphatic hydrocarbons because of its unique physical and chemical properties
Kekulé structures filed six ring structure with three double bonds are berkojugasi and always moving (resonate)
An aromatic compound containing a benzene ring. Naming aromatic compounds are not directly as in the carbon chain. Often more than one name is acceptable and not rare if the old name is still used.
All aromatic compounds based on benzene, C6H6, which has six carbon
Group aromatic group attached to a benzene ring.
Cases where the name is based on benzene
Klorobenzen
This is a simple example where a halogen attached to the benzene ring. Naming is very clear.
The simplified formula C6H5Cl. So you could (although maybe not!) Named fenilklorida. Any if you draw a benzene ring with something attached to it you actually draw phenyl. To tie something you have to throw a hydrogen to produce phenyl.
Nitrobenzen
Nitro classes, NO2, benzene attached to the chain.
The simplified formula C6H5NO2.
Metilbenzen
One more obvious name. Benzene with methyl attached to it. Alkyl group are also follow the naming sama.Contoh, etilbenzen. The old name of metilbenzen is toluene, you may still see it.
The simplified formula C6H5CH3.
(Chloromethyl) benzene
Variations of metilbensen where one hydrogen atom is replaced with a chloride atom. Notice the sign in parentheses, (chloromethyl). This is so that you can understand that chlorine is a methyl group and not part of the ring.
If more than one hydrogen replaced by chlorine, naming would be (diklorometil) benzene or (triklorometil) benzene. Once again note the importance of brackets.
benzoic acid (acid benzenecarboxylic)
Benzoic acid is the old name, but still in common use is easier said and written. Whatever it is called there is a carboxylic acid,-COOH, bound to a benzene ring.
Langganan:
Posting Komentar (Atom)
why aromatic group is always bound to a benzene ring?
BalasHapusoke vina i will try to answer yours. to become aromatic molecule must have p orbital perpendicular to the ring plane to allow for dekolalisation p electrons and all electrons must be paired.and maybe if the plane isn't plane the dekolalisation can not occur.
BalasHapusvina ok i will try to answer the question vina
BalasHapusthat according to the literature I have read that benzene is the parent compound of a large group of organic substances
An aromatic compound is a compound in which atoms are ring-ato ari ring consists of two or more different elements. Heterocyclic ring may be aromatic, just like carbon rings. Benzene, C6H6 hydrocarbons is the parent of a very stable compound known as aromatic compounds. In benzene, implying highly unsaturated structures. For example, compare the amount of hydrogen with hexane, C6H14, or C6H12 Cyclohexane, which both have six carbon but saturated.
BalasHapusBenzene is an aromatic hydrocarbon compound with chemical formula C6H6, the six carbon atoms in benzene to form chains with double bonds in turn. According to Friedrich August Kekulé, Germany (1865), written as the structure of benzene rings with six carbon atoms containing three single bonds and three double bonds that alternate. Framework of carbon atoms in the benzene forming irregular hexagon with bond angles of 1200.
Benzene is not the same as gasoline. Benzene is an aromatic class of compounds known as aromatic aromatic, while gasoline is a mixture of compounds alkanes. structure of benzene can be described as follows:
Position of C and H atoms in benzene are equivalent, so the double bond in the benzene ring can move to move or have resonance.
Benzene nomenclature, namely: monosubstitusi (one sustituen), substituted (two substituents) and polisubstitusi (more than two substituents). Benzene easily substituted. Substitution reaction on benzene include electrophilic aromatic substitution. The first substitution consists of Halogenation, Nitration, Sulfonation, alkylation and Asilasi.Substitusi second, ie Benzene monosubstitusi relive substitution, resulting substituted, where the product is substituted depending on steering ortho substituents, meta and para.