Aromatic-aliphatic hydrocarbons arenes

Aromatic compounds (also called arenes) include benzene and compounds that resemble benzene in chemical behavior. Those properties of benzene that distinguish it from aliphatic hydrocarbons are called aromatic properties. Usually the structures of aromatic compounds are formed with benzene as the basic building block, although a few... 

Much as benzene and phenyl are the simplest aromatic hydrocarbon or arene and aryl group respectively, methane and methyl are the simplest aliphatic hydrocarbon or alkane and alkyl group respectively. The resonance energy of the various halobenzenes may be identified as the negative of the exothermicity of reaction 34. 

From our study so far vve know what kind of chemical properties to expect of an aliphatic hydrocarbon, that is, of an alkane, alkene, or alkyne. We know what kind of chemical behavior to expect of the parent aromatic hydrocarbon, benzene. Many important compounds are not just aliphatic or Just aromatic, however, but contain both aliphatic and aromatic units hydrocarbons of this kind are known collectively as arenes. Ethylbenzene for example, contains a benzene ring and an aliphatic side chain. 

Naphthalene(tricarbonyl)manganese(I) tetrafluoroborate11 is a pale yellow solid (mp 108°C decomp.). It is best kept under inert atmosphere due to its moisture sensitivity. It dissolves readily in CH2C12 but is insoluble in ether and aromatic or aliphatic hydrocarbons. As a MTT reagent, the naphthalene complex undergoes arene substitution faster than the acenaphthene(tricarbonyl)manganese(I) analogue. 

A learning set of 1663 structurally diverse compounds was built. It contained 28 aliphatic hydrocarbons 52 aromatic hydrocarbons 74 alcohols, ethers, or phenols 27 aldehydes and ketones 42 acids and esters 66 amines and nitriles 23 amides and anilides 9 sulfur-containing hydrocarbons 18 nitro arenes 10 amino acids 54 halogenated hydrocarbons 35 nucleosides 25 nucleoside bases and 1200 multifunctional compounds. 

Irradiation of aromatic hydrocarbons such as phenanthrene, anthracene, naphthalene, and certain substituted naphthalenes in the presence of NaBH4 and m- or p-(NC)2C6H4 promotes a Birch-type photoreduction.The reaction seems to occur by electron transfer from the excited singlet state of the arene to the electron acceptor giving the arene radical cations, which are then reduced by the borohydride. Other reducing agents such as NaBH, NaBHjCN, and NaBH(OMe)3 have been found to be effective and all lead to different isomer ratios. In a mechanistically related reaction, both fluoren-9-ol and the corresponding acetate are reported to be photoreduced to the parent hydrocarbon in the presence of aliphatic amines. The products arise by photoinduced electron transfer followed by proton transfer from the amine. The yield depends on the structure of the amine and increases in the order primary < secondary < tertiary amine. In... 

The evidence so far points to an aromatic group (benzene) and a reactive double bond, which must be part of some substituent attached to the benzene ring. In other words, the presence of an arene is suggested. An arene is a hydrocarbon that contains both aliphatic and aromatic units. The presence of the benzene ring is confirmed by the fact, that vigorous oxidation of indene yields phthalic... 

Hydrocarbons that contain both aromatic and aliphatic groups are called arenes. The structures of some arenes are... 

Hydrocarbons that consist of both aliphatic and aromatic groups are also known as arenes. Toluene, ethylbenzene, and isopropylbenzene are alkylbenzenes ... 

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