Heterocyclic compounds possess a cyclic structure with two or more different kinds of atoms in the ring. This work is devoted to organic heterocyclic compounds in which the ring contains at least one carbon atom; all atoms other than carbon are considered as heteroatoms. Carbon is still by far the most common ring atom in heterocyclic compounds, but the number and variety of heteroatoms in the rings of known compounds has increased as the years go by and thus there is a steady transition to include the expanding domain of inorganic heterocyclic systems. Since rings can be of any size, from three-membered upwards, and since the heteroatoms can be drawn in almost any combination from a large number of the elements (though nitrogen, oxygen, and sulfur are still by far the most common), the number of possible heterocyclic systems is almost limitless. An enormous number of heterocyclic compounds is known and this number continues to increase very rapidly. The literature of the subject is correspondingly vast and of the three major divisions of organic chemistry, aliphatic, carbocyclic, and heterocyclic, the last is by far the largest. Over 31 million compounds are now recorded in Chemical Abstracts and a very large proportion of these are heterocyclic.
|Title of host publication
|V1 3-memb. Heterocycl., together with all Fused Syst. contain. a 3-memb. Heterocycl. Ring. V2 4-memb. Heterocycl. together with all Fused Syst. contain. a 4-memb. Heterocycl. Ring. V3 Five-memb. Rings with One Heteroat. together with their Benzo and other Carbocycl.-fused Deriv. V4 Five-memb. Rings with Two Heteroat., each with their Fused Carbocycl. Deriv.
|Number of pages
|Published - 1 Jan 2008