Bifenyyliryhmä

Bifenyyliryhmä is a Finnish term that translates to "biphenyl group" or "biphenyl moiety" in English. It refers to a chemical structure consisting of two phenyl rings connected by a single bond. The phenyl ring is a six-carbon aromatic ring with the chemical formula C6H5. Therefore, a biphenyl group, often represented as C12H9, is formed when two such rings are directly linked.

In organic chemistry, the biphenyl structure serves as a core unit in many molecules. The rotation around the central single bond between the phenyl rings can be hindered, especially if there are bulky substituents on the ortho positions of either ring. This restricted rotation can lead to atropisomerism, where different spatial arrangements of the molecule are stable and can be isolated.

Biphenyl groups are found in various applications. They are components of some liquid crystals used in displays due to their rigid and elongated structure. Biphenyl derivatives are also utilized as antioxidants, flame retardants, and in the synthesis of pharmaceuticals and agrochemicals. The biphenyl unit's electron-rich nature and ability to undergo electrophilic aromatic substitution make it a versatile building block in organic synthesis. The specific properties and reactivity of a molecule containing a biphenyl group are heavily influenced by any additional functional groups attached to the phenyl rings.