The maximum number of stereoisomers = 2" where n = the number of stereogenic centers. [Pg.118]

With two stereogenic centers, the maximum number of stereoisomers = 4. [Pg.178]

When n = 2, 2 = 4. With two stereogenic centers, the maximum number of stereoisomers is four, although sometimes there are fewer than four. [Pg.176]

When a molecule has two or more stereogenic (chiral) centers, there are a maximum of 2" stereoisomers, where n = the number of chiral centers. When a molecule has two or more chiral centers, diastereomers are possible. Diastereomer is the term for two or more stereoisomers that are not superimposable and not mirror images. A diastereomer that has symmetry such that its mirror image is superimposable is called a meso compound. If there is no symmetry, cyclic molecules can have enantiomers and diastereomers. If there is symmetry in one diastereomer, cyclic compounds can have meso compounds 23, 24, 25, 26, 27, 28, 29, 30, 48, 49, 59, 60, 62,63,67,68,69, 70, 71, 75, 78, 79. [Pg.404]

Whereas 2,3-dibromopentane has two stereogenic centers and the maximum of four stereoisomers, 2 -dibromobutane has two stereogenic centers but fewer than the maximum number of stereoisomers. [Pg.178]

When two or more of a molecule s stereogenic centers are equivalently substituted, meso forms are possible, and the number of stereoisomers is then less than 2". Thus, 2" represents the maximum number of stereoisomers for a molecule containing n stereogenic centers. [Pg.282]

For each of the following molecules, determine the total number of stereogenic centers, the absolute configuration of each of those centers, and the maximum number of possible stereoisomers [Pg.409]

Section 7.12 For a particular constitution, the maximum number of stereoisomers is 2", where n is the number of structural units capable of stereochemical variation—usually this is the number of stereogenic centers, but can include E and Z double bonds as well. The number of stereoisomers is reduced to less than 2" when there are meso forms. [Pg.293]

Going from one to two stereogenic centers in a molecule led to greater complexity with respect to the number of stereoisomers. Molecules with three or more chiral centers are even more complex, in accord with the 2" rule, where three stereogenic centers lead to a maximum of eight stereoisomers. [Pg.385]

Many naturally occurring compounds contain several stereogenic centers. By an analysis similar to that described for the case of two stereogenic centers, it can be shown that the maximum number of stereoisomers for a particular constitution is 2 , where n is equal to the number of stereogenic centers. [Pg.282]

The only difference to the simple diastereoselection lies in the fact that the olefmic components now have two reactive sites each, namely the two olefmic sp1 centers, which are all converted into sp3, and hence potentially stereogenic centers. However, the configurations of these stereogenic centers are not independent, but mutually correlated by the principle of suprafacial addition (see Section 2.3.1). Thus, although a maximum of 24 stereoisomers could be formed, this number must be divided in half for each olefmic reactant with a defined (E)) Z) configuration. This results in only four stereoisomers in the form of two enantiomeric pairs of ejeo/enrfo-diastereomers. [Pg.119]

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