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Topic: how many hemiketal/acetal centers are there?  (Read 3218 times)

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Offline billsauce

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how many hemiketal/acetal centers are there?
« on: February 15, 2013, 07:48:42 PM »
hemiketal = OR, OH, R, R
acetal = OR, OR, H, R/H

The picture is attached. I see 1 ketal at carbon 5, and 2 acetals at carbon 3 and 14. Do you guys see any others or is that it?
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Offline Dan

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Re: how many hemiketal/acetal centers are there?
« Reply #1 on: February 16, 2013, 06:10:45 AM »
Quote from: billsauce on February 15, 2013, 07:48:42 PM
hemiketal = OR, OH, R, R
acetal = OR, OR, H, R/H

OK

Quote
I see 1 ketal at carbon 5

What are the substrituents at carbon 5? Compare this to your posted definitions of ketal and hemiketal.

Quote
2 acetals at carbon 3 and 14.

OK

Quote
Do you guys see any others or is that it?

I see another.
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Offline billsauce

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Re: how many hemiketal/acetal centers are there?
« Reply #2 on: February 16, 2013, 02:20:22 PM »
where? I only see acetals at 3 and 14, and a ketal at 5. there are no other places that have 2 OR groups right next to each other, and no places that have OH, OR, R, R
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Offline discodermolide

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Re: how many hemiketal/acetal centers are there?
« Reply #3 on: February 16, 2013, 02:24:22 PM »
If you see a ketal at carbon 5 then the same functionality is also at carbon 18 (assuming I can see OK)
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Offline billsauce

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Re: how many hemiketal/acetal centers are there?
« Reply #4 on: February 16, 2013, 03:21:23 PM »
carbon 18 has a hydrogen that isnt drawn in there, so that is a hemiacetal not a hemiketal
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Offline billsauce

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Re: how many hemiketal/acetal centers are there?
« Reply #5 on: February 16, 2013, 10:32:54 PM »
i think the answer is 2 acetals at 3 and 14, and a hemiketal at 5
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Offline Dan

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Re: how many hemiketal/acetal centers are there?
« Reply #6 on: February 17, 2013, 05:16:20 AM »
hemiacetal (5), acetal (3, 14), hemiacetal (18).
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