In chemistry, a heteroatom (from Ancient Greek heteros 'different' and atomos 'uncut') is, strictly, any atom that is not carbon or hydrogen. In practice...

five heteroatoms The hypothetical chemical compound with five nitrogen heteroatoms would be pentazine. Six-membered rings with six heteroatoms The hypothetical...

These reactions are used to form carbon–carbon bonds but also carbon-heteroatom bonds. Cross-coupling reaction are a subset of coupling reactions. Richard...

atoms in azoles starts with the heteroatom that is not part of a double bond, and then proceeds towards the other heteroatom. Imidazole and other five-membered...

In chemistry, a double bond is a covalent bond between two atoms involving four bonding electrons as opposed to two in a single bond. Double bonds occur...

Bonding between carbon–carbon Bonding between carbon–heteroatom Bonding between heteroatom–heteroatom Bond formation between carbon atoms forms very thermodynamically...

In biochemistry, flavin adenine dinucleotide (FAD) is a redox-active coenzyme associated with various proteins, which is involved with several enzymatic...

In organic chemistry, hydroboration refers to the addition of a hydrogen-boron bond to certain double and triple bonds involving carbon (C=C, C=N, C=O...

further broken down by what type of atom they incorporate (a carbon or a heteroatom) into the expanded ring. These reactions have the general features of...

whereby a carbon–carbon or carbon–heteroatom single bond is cleaved or undergoes lysis (breakdown) by hydrogen. The heteroatom may vary, but it usually is oxygen...

The main chain contains No heteroatom Heteroatoms present Nitrogen-containing Sulfur-containing Aromatic cycles Poly(fluorene)s polyphenylenes polypyrenes...

(i.e. with "C"), whereas heteroatoms are always explicitly noted as such ("N" for nitrogen, "O" for oxygen, etc.) Heteroatoms and other groups of atoms...

two additional single, or σ, bonds. Addition of a nucleophile to carbon–heteroatom double or triple bonds such as >C=O or -C≡N show great variety. These...

than it would be for a primary or secondary alkyl chloride without a heteroatom.[citation needed] Ph−S−CH2−CH2−Cl reacts with water 650 times faster than...

one prefix, if more than one type of heteroatom is present; a multiplicative prefix if there are several heteroatoms of the same type; and locants to indicate...

Heteroatom-promoted lateral lithiation is the site-selective replacement of a benzylic hydrogen atom for lithium for the purpose of further functionalization...

that describes the tendency of heteroatomic substituents adjacent to a heteroatom within a cyclohexane ring to prefer the axial orientation instead of the...

double bonds (alkenes) or triple bonds (alkynes). If other elements (heteroatoms) are bound to the carbon chain, the most common being oxygen, nitrogen...

atoms. It should have the maximum number of heteroatoms. It should have the maximum number of senior heteroatoms (in order: O, S, N, P, Si, B). For chains:...

relationship between compounds with the same polyvalent functional group with heteroatom but differ in the main carbon chain or any of the side chains. It has...

if it both applies and a heteroatom is found in a chain, is preferred over substitution. If it applies but no heteroatom is found in a chain, it is...

In organic chemistry, Hückel's rule predicts that a planar ring molecule will have aromatic properties if it has 4n + 2 π-electrons, where n is a non-negative...

least one methine or vinylene (-C= or -CH=CH-) group is replaced by a heteroatom: oxygen, nitrogen, or sulfur. Examples of non-benzene compounds with aromatic...

of heteroatoms in the molecule and a half-integer value of u indicates the presence of an odd number of nitrogen atoms. On addition of heteroatoms, the...

Unactivated C−H bonds are found in alkanes and are not adjacent to a heteroatom (O, N, Si, etc.). Such bonds usually only participate in radical substitution...

converted to the corresponding halides. Most functional groups feature heteroatoms (atoms other than C and H). Organic compounds are classified according...

structural details. Aromatic systems containing heteroatoms are resistant to this ring-opening as heteroatom oxidation occurs preferentially and deactivates...

substitution reactions, due to the electron-donating effects of the oxygen heteroatom. It reacts with bromine at 0 °C to give 2-bromofuran. Hydrogenation of...

Nitrosation and nitrosylation are two names for the process of converting organic compounds or metal complexes into nitroso derivatives, i.e., compounds...

contribution of dispersive attraction, particularly in the presence of heteroatoms. London dispersion forces are also known as 'dispersion forces', 'London...