The formation of a covalent @[email protected], the two shared electrons of which have come from only one of the two parts of the @[email protected] linked by it, as in the reaction of a @[email protected] and a @[email protected] to form a @[email protected]; alternatively, the bonding formed in this way. In the former sense, it is the reverse of @[email protected] '@[email protected]' and '@[email protected]' are synonymous (obsolescent) terms. The synonym '@[email protected]' is obsolete. (The origin of the bonding electrons has by itself no bearing on the character of the bond formed. Thus, the formation of methyl chloride from a methyl @[email protected] and a chloride ion involves coordination; the resultant bond obviously differs in no way from the C–Cl bond in methyl chloride formed by any other path, e.g. by @[email protected] of a methyl radical and a chlorine atom.) The term is also used to describe the number of @[email protected] around a @[email protected] without necessarily implying two-electron bonds.
See also:
dipolar bond
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1100 [Terms] [Paper]