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Topic: Cyclic acetals derived from aldehydes.  (Read 7868 times)

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Offline Fzang

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Cyclic acetals derived from aldehydes.
« on: March 01, 2011, 06:51:29 AM »


Which of these are derived from 4-hydroxyheptanal? I've tried but I really can't draw any 5-membered rings that look like any of the above (while I know some of them are not even 7-carbon). What am I not understanding?
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Offline sjb

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Re: Cyclic acetals derived from aldehydes.
« Reply #1 on: March 01, 2011, 10:23:43 AM »
Quote from: Fzang on March 01, 2011, 06:51:29 AM


Which of these are derived from 4-hydroxyheptanal? I've tried but I really can't draw any 5-membered rings that look like any of the above (while I know some of them are not even 7-carbon). What am I not understanding?

How do you form a regular hemi-acetal from, say butanal and ethanol?
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Offline Fzang

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Re: Cyclic acetals derived from aldehydes.
« Reply #2 on: March 01, 2011, 02:42:53 PM »


Wow, I'm sorry. I guess I might've looked a completely wrong place, i.e. drawing a different angle than the answer shows. I really have no explanation why I failed that so miserably.  :-X
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