[peacefulltortoise]

I have 2 related problems:
1, Why only polyol with at least 2 OH's Carbons beside each other could make deep blue solution with Cu(OH)2? At first I thought it was because of the 5 atoms ring that is stable, but then someone said the complex must be more stable with 6 atoms ring as the 2 OH's are separated by another Carbon. Do you have any idea?
2, Sucrose haven't got any couple of OH groups which are cis, how could sucrose make deep blue solution with Cu(OH)2?

[peacefulltortoise]

Hey guys, please tell me what you think about my questions.

[Albert]

2, Sucrose haven't got any couple of OH groups which are cis, how could sucrose make deep blue solution with Cu(OH)2?

Sucrose is the most frequent example of NON-reducing sugar. However, you shouldn't be surprised: copper hydroxide is actually blue. You should be shocked if you see a reddish precipitate.

By the way, why is this post here? It must be in the biochemistry forum.

[peacefulltortoise]

I don't understand. So what we have known is not true, isn't it? Could you please explain me more? By the way, I did not mean about reductibility of sugar, I meant the property of polyol compoud. Thank you for your answer.

[AWK]

I have 2 related problems:

2, Sucrose haven't got any couple of OH groups which are cis, how could sucrose make deep blue solution with Cu(OH)2?

Did you inspected a spacial model of sucrose?