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2. SNi - Wikipedia

   en.wikipedia.org/wiki/SNi

   In chemistry, S N i (substitution nucleophilic internal) refers to a specific, regio-selective but not often encountered reaction mechanism for nucleophilic aliphatic substitution.

3. Associative substitution - Wikipedia

   en.wikipedia.org/wiki/Associative_substitution

   The terminology is typically applied to organometallic and coordination complexes, but resembles the Sn2 mechanism in organic chemistry. The opposite pathway is dissociative substitution, being analogous to the Sn1 pathway. Intermediate pathways exist between the pure associative and pure dissociative pathways, these are called interchange ...

4. Nucleophilic aromatic substitution - Wikipedia

   en.wikipedia.org/wiki/Nucleophilic_aromatic...

   One classic reaction is the Chichibabin reaction (Aleksei Chichibabin, 1914) in which pyridine is reacted with an alkali-metal amide such as sodium amide to form 2-aminopyridine. [ 6 ] In the compound methyl 3-nitropyridine-4-carboxylate, the meta nitro group is actually displaced by fluorine with cesium fluoride in DMSO at 120 °C.

5. List of metal detecting finds - Wikipedia

   en.wikipedia.org/wiki/List_of_metal_detecting_finds

   This is a list of historically significant items found by metal detecting method, only excluding magnet fishing finds, since magnet fishing is usually considered a distinctively different and separate hobby from traditional metal detecting.

6. SN2 reaction - Wikipedia

   en.wikipedia.org/wiki/SN2_reaction

   Competition experiment between SN2 and E2. With ethyl bromide, the reaction product is predominantly the substitution product. As steric hindrance around the electrophilic center increases, as with isobutyl bromide, substitution is disfavored and elimination is the predominant reaction. Other factors favoring elimination are the strength of the ...

7. Low-background steel - Wikipedia

   en.wikipedia.org/wiki/Low-background_steel

   Low-background steel, also known as pre-war steel [1] and pre-atomic steel, [2] is any steel produced prior to the detonation of the first nuclear bombs in the 1940s and 1950s. Typically sourced from ships (either as part of regular scrapping or shipwrecks ) and other steel artifacts of this era, it is often used for modern particle detectors ...