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PhF behaves rather differently from other halobenzene derivatives owing to the pi-donor properties of fluoride. For example, the para position is more activated than benzene toward electrophiles. For this reason, it can be converted to 1-bromo-4-fluorobenzene with relatively high efficiency. [3]
Download as PDF; Printable version; In other projects Wikidata item; Appearance. ... Halobenzene may also refer to any of the monosubstituted halobenzenes: Fluorobenzene;
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PHF is a three letter acronym meaning: Paired Helical Filaments , a term for aggregations of protein in the brain, in conditions such as Alzheimer's disease The Pakistan Hockey Federation , national governing body for field hockey
Neurofibrillary tangles are formed by hyperphosphorylation of a microtubule-associated protein known as tau, causing it to aggregate, or group, in an insoluble form.(These aggregations of hyperphosphorylated tau protein are also referred to as PHF, or "paired helical filaments").
Halocarbon compounds are chemical compounds in which one or more carbon atoms are linked by covalent bonds with one or more halogen atoms (fluorine, chlorine, bromine or iodine – group 17) resulting in the formation of organofluorine compounds, organochlorine compounds, organobromine compounds, and organoiodine compounds.
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The +M effect, also known as the positive mesomeric effect, occurs when the substituent is an electron donating group. The group must have one of two things: a lone pair of electrons, or a negative charge. In the +M effect, the pi electrons are transferred from the group towards the conjugate system, increasing the density of the system.