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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]
Aside from these effects, there is often also a steric effect, due to increased steric hindrance at the ortho position but not the para position, leading to a larger amount of the para product. The effect is illustrated for electrophilic aromatic substitutions with alkyl substituents of differing steric demand for electrophilic aromatic nitration.
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It can be a short-term problem prompted by performance anxiety or stress, or it can be a long-term issue related to certain health conditions or medications. Signs of ED include:
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Halobenzene derivatives (4 C, 1 P) Halobenzenes (5 C, 1 P) I. Iodobenzene compounds (2 C) This page was last edited on 1 February 2024, at 18:51 (UTC). Text is ...
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