Rapid rotation around C=C bonds does not occur.

The term diastereomer refers to the particular kind of stereoisomer that is described in this video, it is another word for this kind of stereoisomer. Later we will encounter stereoisomers that are not diastereomers, but we are introducing the term here (although we don't really need it) to avoid introducing two new terms later. For now you can use diastereomer and stereoisomer interchangeably (although not so later).



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