Confusing Diastereomer Question

[SyrianHero]

In the Kaplan Ochem book, it states that E-2-butene and Z-2-butene are diastereomers, but there is no chiral carbon in either molecule. The book defines Disastereomers as molecules that are chiral and share the same connectivity, but are not mirror images of each other. Am I missing something?

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[Dr. Trenb]

What you're thinking about is alkane stereoisomers, not alkene stereoisomers. Maybe this will help:
http://chemwiki.ucdavis.edu/Organic...nd_Stereochemistry/Section_3.7:_Diastereomers
Go down to section 3.7C: Stereoisomerism of alkenes