2016年1月23日 · An aldose contains an aldehyde group; a ketose contains a ketone group, The ending -ose tells you that both aldoses and ketoses are carbohydrates. Carbohydrates are just polyhydroxyaldehydes (aldoses) or polyhydroxyketones (ketoses). So, for a carbohydrate to be an aldose it needs an aldehyde group and, to be a ketose, it needs a ketone group. In the …

2018年3月6日 · See Below There is generally 1 carbohydrate found in nucleic acids. That is the 5 carbon Aldose sugar called Ribose. RNA has a ribose sugar. If you remove the hydroxyl group on the second carbon of Ribose, you get something called 2`-dexoyribose. This is still Ribose, but is missing its OH group at carbon 2. This is the sugar used in DNA. RNA has a Ribose sugar, …

2018年1月25日 · More or less the same as Aldoses.. The biochemical class of compounds known as Sugars can roughly be divided in two categories: Aldoses and Ketoses. They typically contain between 3 and 7 Carbon atoms: 3:rarr Trioses 4:rarr Tetroses 5:rarr Pentoses 6:rarr Hexoses 7:rarr Heptoses 7 seems to be the maximum: there are no (known) sugars containing 8 or …

2015年10月14日 · A hexose, which is generically a sugar that had six carbons in its straight-chained form. Simply put, "ose" is the suffix for a sugar, and "hex" is the prefix for six. A hexose originally has 6 carbons as a straight-chained molecule, and after being put into water, it rapidly interconverts in an equilibrium between its straight-chained form and its cyclic form. An aldose …

2014年12月15日 · Here's one way to do it. > Assume that you have to find the chiral centres in 3-aminocyclohexanol. (Adapted from Sigma-Aldrich) Here are the steps to find the chiral centres. Step 1: Ignore all atoms that cannot be chiral centres. These include "CH"_2, "CH"_3, and "NH"_2 groups, oxygens, halogens, and any atom that is part of a double or triple bond. That …

2014年7月7日 · Glucose contains aldehyde, alcohol, and hemiacetal groups. Glucose exists in a straight-chain form and in various cyclic forms. In the straight-chain form, the functional group at C-1 is an aldehyde group. The functional groups on C-2 to C-6 are alcohol groups. In the cyclic form, the functional group on C-1 is a hemiacetal group. A hemiacetal has an OH and an OR …

2015年11月25日 · Since for every atom that can exist in more than one configuration, you have R or S (#sp^3#), or E or Z (#sp^2#), you have two configurations for each of those atoms.

2015年7月22日 · You look at the position of the "OH" (or "OR") group at the anomeric carbon. > The cyclic forms of carbohydrates can exist in α and β forms, based on the position of the substituent at the anomeric carbon. To assign the α or β configuration to the cyclic form of a carbohydrate, look at the relative positions of the "CH"_2"OH" group and the "OH" (or "OR") …

2017年9月4日 · Carbonyl and hydroxyl groups. Carbohydrates usually contain a carbonyl (=O) and hydroxyl (-OH) functional group. Clearly illustrated here the carbonyl group bonds with a carbon atom to form a ring structure that is often found in polysaccharides that usually form hydrogen bonds with the hydroxyl groups.

2017年3月3日 · This is a so-called "comproportionation reaction". "Iodic acid" is reduced to elemental iodine: HI^(+V)O_3 + 5H^(+)+5e^(-) rarr 1/2I_2 +3H_2O (i) "Iodide" is oxidized to elemental iodine: I^(-) rarr 1/2I_2+e^(-) (ii) So (i)+5xx(ii)= HI^(+V)O_3 + 5H^(+)+5I^(-) rarr 3I_2 +3H_2O This is AFAIK balanced with respect to mass and charge, and therefore a reasonable …