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1 The two forms are sometimes described as  anomers  since they are isomers at the anomeric center. 2  To assign the cyclic form of a carbohydrate as the Î±- or Î²- form look at the relative positions of the-CH 2 OH group and-OH (or-OR) group at the anomeric center. In the Î²- form, the exocyclic O group at the anomeric center is on the same face as the-CH 2 OH group. 2  If a mixture of the Î±- and Î²- anomers are present, then this is often represented by using a wavy line to represent the bond:
1 Cyclic anhydrides derived from dicarboxylic acids are name as-dioic anhydrides. 2  Functional group is an acid anhydride therefore suffix = - oic anhydride. 3  Hydrocarbon structure is an alkane therefore-an-. 4  The longest continuous chain is C2 therefore root = eth. As the name implies, acid anyhydrides are derivatives of carboxylic acids. 2  In principle, they can be symmetric (where the two R groups are identical) or asymmetric (where the two R groups are different). 3  Symmetric anhydrides are the most common, they are named as alkanoic anhydrides.