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  2. Reaction intermediate - Wikipedia

    en.wikipedia.org/wiki/Reaction_intermediate

    In an HX addition reaction, the pi bond of an alkene acts as a nucleophile and bonds with the proton of an HX molecule, where the X is a halogen atom. This forms a carbocation intermediate, and the X then bonds to the positive carbon that is available, as in the following two-step reaction. [4] CH 2 CH 2 + HX → CH 2 CH + 3 + X − CH 2 CH + 3 ...

  3. Addition–elimination reaction - Wikipedia

    en.wikipedia.org/wiki/Addition–elimination...

    In chemistry, an addition-elimination reaction is a two-step reaction process of an addition reaction followed by an elimination reaction. This gives an overall effect of substitution , and is the mechanism of the common nucleophilic acyl substitution often seen with esters , amides , and related structures.

  4. Addition reaction - Wikipedia

    en.wikipedia.org/wiki/Addition_reaction

    In organic chemistry, an addition reaction is an organic reaction in which two or more molecules combine to form a larger molecule called the adduct. [ 1 ] [ 2 ] An addition reaction is limited to chemical compounds that have multiple bonds .

  5. Step-growth polymerization - Wikipedia

    en.wikipedia.org/wiki/Step-growth_polymerization

    The easiest way to visualize the mechanism of a step-growth polymerization is a group of people reaching out to hold their hands to form a human chain—each person has two hands (= reactive sites). There also is the possibility to have more than two reactive sites on a monomer: In this case branched polymers production take place.

  6. Cycloaddition - Wikipedia

    en.wikipedia.org/wiki/Cycloaddition

    In this notation, a Diels-Alder reaction is a (4+2)cycloaddition and a 1,3-dipolar addition such as the first step in ozonolysis is a (3+2)cycloaddition. The IUPAC preferred notation however, with [i+j+...] takes electrons into account and not atoms. In this notation, the DA reaction and the dipolar reaction both become a [4+2]cycloaddition.

  7. Woman Missing After Not Getting on Connecting Flight Sent ...

    www.aol.com/lifestyle/woman-missing-not-getting...

    Hannah Kobayashi, from Hawaii, has been missing since she landed in Los Angeles on Friday, Nov. 8. A Hawaii woman who has been missing since she failed to board a connecting flight in Los Angeles ...

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