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trans and cis attachments to cyclic carbon structures

Posted: Sun Mar 12, 2017 2:44 pm
by Emi Nakahara 3F
I am confused on how you are able to tell whether a substituent is attached trans or cis to a cyclic carbon structure. In the Introduction to Organic Chemistry textbook page 60, there is an example molecule of cinnamaldehyde, and its IUPAC name includes E because the aldehyde is attached trans to carbon three on the benzene ring. But I'm not really sure what that means or how to visualize it on the molecule?

Re: trans and cis attachments to cyclic carbon structures

Posted: Sun Mar 12, 2017 3:26 pm
by Sophia Rawson 1C
I found this a little confusing as well, but understood it more after I thought of the benzene ring as a substituent. This benzene ring substituent is trans to carbon three, where O is attached to the double bond.