kaplan review notes question

[Mstoothlady2012]

Hello everyone,

I don't understand why # 6 in review problems of chapter 14 in orgo section is C? Acetals can be in cyclic form of monosaccharides as well can't they? Thanks in advance!

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[ddsjc2014]

No. If you refer to page 458, D-Glucose. You can make it to hemiacetal by forming bond with C5 hydroxyl group and carbonyl carbon in C1. But You just simply can not make cyclic form of Acetal by connecting any of alcohol with any carbon it won't be the cyclic form.

 

[Mstoothlady2012]

figure 14.10 (pg 460) shows acetal in chair conformation

 

[Sea of ASH]

figure 14.10 (pg 460) shows acetal in chair conformation

hemiacetal (monosac. ring) + alcohol = acetal (glycoside)
the acetal form are termed glycosides, not monosaccharides!

when the alcohol is another monosaccharide thats called di- or poly saccharides.

get it? its just the terminology.