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The simplest aryl group is phenyl, which is made up of a benzene ring with one of its hydrogen atom replaced by some substituent, and has the molecular formula C 6 H 5 −. Note that a phenyl group is not the same as a benzyl group, the latter consisting of a phenyl group attached to a methyl group and a molecular formula of C 6 H 5 CH 2 −. [2]
In organic chemistry, the phenyl group, or phenyl ring, is a cyclic group of atoms with the formula C6H5, and is often represented by the symbol Ph (archaically φ) or Ø. The phenyl group is closely related to benzene and can be viewed as a benzene ring, minus a hydrogen, which may be replaced by some other element or compound to serve as a ...
Phenyl groups have low migratory aptitude, but higher electron density at the migrating carbon increases migratory aptitude, facilitating [1,2]-aryl migration and allowing the reaction to continue. M-hydroxy compounds do not concentrate electron density at the migrating carbon (12a, 12b, 12c, 12d); their aryl groups' migratory aptitude remains low.
As such, an Ullmann condensation can be employed: an aryl halide is able to react with phenol (or its derivatives) to form a bis-aryl ether in the presence of a copper-based catalyst, such as copper(II) oxide. [7] An Ullmann condensation between p-methylphenolate and bromobenzene in the presence of a copper catalyst to form 4-methyl-1 ...
The hydrocarbyl group names that end in -yl are not acyl groups, but alkyl groups derived from alkanes (methyl, ethyl, propyl, butyl), alkenyl groups derived from alkenes (propenyl, butenyl), or aryl groups .
It would involve the unaided loss of the leaving group and the formation of an aryl cation. [4] The nitro group is the most commonly encountered activating group, other groups are the cyano and the acyl group. [5] The leaving group can be a halogen or a sulfide. With increasing electronegativity the reaction rate for nucleophilic attack ...
An ethoxy group (CH 3 CH 2 O−) is found in the organic compound ethyl phenyl ether (C 6 H 5 OCH 2 CH 3, also known as ethoxybenzene). Related to alkoxy groups are aryloxy groups, which have an aryl group singularly bonded to oxygen such as the phenoxy group (C 6 H 5 O−). An alkoxy or aryloxy group bonded to an alkyl or aryl (R−O−R') is ...
Electron donating groups, for example amino, hydroxyl, alkyl, and phenyl groups tend to be ortho/para-directors, and electron withdrawing groups such as nitro, nitrile, and ketone groups, tend to be meta-directors.