Stereospecificity vs. Stereoselectivity and Regiospecificity vs. Regioselectivity

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That was no dream, buddy!

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[@danielblancoania8194]

Stereoselectivity/stereoselective: Stereoselectivity is the preferential formation in a of one stereoisomer over another. When the stereoisomers are enantiomers, the phenomenon is called enantioselectivity and is quantitatively expressed by the enantiomer excess; when they are diastereoisomers, it is called diastereoselectivity and is quantitatively expressed by the diastereomer excess. Reactions are termed (100%) stereoselective if the discrimination is complete or partially (%) stereoselective if one product predominates. The discrimination may also be referred to semiquantitatively as high or low stereoselectivity.

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[@danielblancoania8194]

Stereospecificity/stereospecific: (1) A reaction is termed stereospecific if starting materials differing only in their configuration are converted into stereoisomeric products. According to this definition, a stereospecific process is necessarily stereoselective but not all stereoselective processes are stereospecific. Stereospecificity may be total (100%) or partial. The term is also applied to situations where reaction can be performed with only one stereoisomer. For example the exclusive formation of trans-1,2-dibromocyclohexane upon bromination of cyclohexene is a stereospecific process, although the analogous reaction with (E)-cyclohexene has not been performed. (2) The term has also been applied to describe a reaction of very high stereoselectivity, but this usage is unnecessary and is discouraged.

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not yet i think they announce finalists in a month or two!

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[@danielblancoania8194]

I think it's important not to create confusion and not to misuse the well-defined terms. It's only my advice. Cheers, Dani

[@danielblancoania8194]

Regioselectivity/regioselective: A regioselective reaction is one in which one direction of bond making or breaking occurs preferentially over all other possible directions. Reactions are termed completely (100%) regioselective if the discrimination is complete, or partially (%), if the product of reaction at one site predominates over the product of reaction at other sites. The discrimination may also semi-quantitatively be referred to as high or low regioselectivity. In the past, the term "regiospecificity" was proposed for 100% regioselectivity. This terminology is not recommended owing to inconsistency with the terms stereoselectivity and stereospecificity

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[@bruskmusked7648]

nicely explained

[@bunny4173]

BOOKS MENTION "REGIOSELECTIVITY" FOR ALKENES INSTEAD OF "REGIOSPECIFICITY" ?? Any reason for that ?

[@mohsenjavadzadeh-i6y]

thanks alot dear professor .

[@shivangipal6883]

Great lecture

[@danielblancoania8194]

Hello. First, I want to say that I like your channel very much (and I can see that this feeling is quite general among people). Secondly, I have to tell you that what you present here is a simplification of the real situation that leads to error. In principle, the term "regiospecific" doesn't exist because it is inconsistent with the definitions of "stereoselective" and "stereospecific". The reaction that you have presented is completely (100%) regioselective, but not regiospecific. I post here the IUPAC definitions:

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Great video!! Thank you

[@koen9910]

Is it possible voor a reaction to be regiospecefic and stereospecic at the same time?

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yep

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