Substituents in a sentence

There are three types: isotactic (all substituents on the same side), atactic (random placement of substituents), and syndiotactic (alternating placement of substituents).

As a variety of carbon substituents can be introduced to the raw material of the triflone, this method greatly speeds up the previously very challenging gem-difluoroalkene synthesis process.

After the substituents of a stereocenter have been assigned their priorities, the molecule is oriented in space so that the group with the lowest priority is pointed away from the observer.

A polymer that lacks any regular arrangement in the position of its alkyl substituents (R) is called atactic.

Benzene and derivatives of benzene Benzene derivatives have from one to six substituents attached to the central benzene core.

Cis–trans and E-Z isomerism main Stereoisomerism about double bonds arises because rotation about the double bond is restricted, keeping the substituents fixed relative to each other.

Classes of ketones Ketones are classified on the basis of their substituents.

Double bonds: E/Z main For alkenes and similar double bonded molecules, the same prioritizing process is followed for the substituents.

Eutactic polymers In eutactic macromolecules, substituents may occupy any specific (but potentially complex) sequence of positions along the chain.

Heterocyclic compounds main The characteristics of the cyclic hydrocarbons are again altered if heteroatoms are present, which can exist as either substituents attached externally to the ring (exocyclic) or as a member of the ring itself (endocyclic).

However, even a condensed chemical formula is necessarily limited in its ability to show complex bonding relationships between atoms, especially atoms that have bonds to four or more different substituents.

If the high-priority substituents are on the same side of the bond, it is assigned Z (Ger.

If the relative priorities of these substituents need to be established, R takes priority over S. When this happens, the descriptor of the stereocenter is a lowercase letter (r or s) instead of the uppercase letter normally used.

If the thumb points in the direction of the 4th substituent, the enantiomer is R. Otherwise, it's S. It is possible in rare cases that two substituents on an atom differ only in their absolute configuration (R or S).

In a trans isomer, the dipoles of the substituents will cancel out due to being on opposite sides of the molecule.

In this case, it is the placing of the two highest priority substituents with respect to the double bond which matters.

It is also possible to have four organic substituents on the nitrogen.

It is a pyrimidine derivative, with a heterocyclic aromatic ring and two substituents attached (an amine group at position 4 and a keto group at position 2).

More complex alkenes may be named with the E–Z notation for molecules with three or four different substituents (side groups).

Names of radicals or moieties These names are used to refer to the moieties themselves or to radical species, and also to form the names of halides and substituents in larger molecules.