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A heterocyclic compound or ring structure is a cyclic compound that has atoms of at least two different elements as members of its ring(s). [1] Heterocyclic organic chemistry is the branch of organic chemistry dealing with the synthesis, properties, and applications of organic heterocycles .
Biphenylene is a polycyclic hydrocarbon, composed of two benzene rings joined by two bridging bonds (as opposed to a normal ring fusion), thus forming a 6-4-6 arene system. The resulting planar structure [4] was one of the first π-electronic hydrocarbon systems discovered to show evidence of antiaromaticity.
[1] [2] Simple aromatic rings can be heterocyclic if they contain non-carbon ring atoms, for example, oxygen, nitrogen, or sulfur. They can be monocyclic as in benzene, bicyclic as in naphthalene, or polycyclic as in anthracene. Simple monocyclic aromatic rings are usually five-membered rings like pyrrole or six-membered rings like pyridine.
It is an aromatic compound that has two benzene rings fused to a central furan ring. All the numbered carbon atoms have a hydrogen atom bonded to each of them. It is a volatile white solid that is soluble in nonpolar organic solvents. It is obtained from coal tar, where it exists as a 1% component. [1]
1,2-Dioxin or 1,4-Dioxin, two unsaturated heterocyclic 6-membered rings in which two carbon atoms have been replaced by oxygen atoms, which gives the molecular formula C 4 H 4 O 2 Dibenzo-1,4-dioxin , also known as dibenzodioxin or dibenzo- p -dioxin (molecular formula C 12 H 8 O 2 ), in which two benzene rings are connected through two oxygen ...
Addition of Br 2 in acetic acid places two equivalents of bromine on the benzene ring. NH 2 is an electron donating group, and NO 2 is an electron withdrawing group, which both direct bromination to the meta position relative to the NO 2 substituent. Addition of NaNO 2, H 2 SO 4, and EtOH removes the NH 2 substituent.
Dibenzo-1,4-dioxin, also dibenzodioxin or dibenzo-p-dioxin (dibenzo-para-dioxin), is a polycyclic heterocyclic organic compound in which two benzene rings are connected by a 1,4-dioxin ring. Its molecular formula is C 12 H 8 O 2. The two oxygen atoms occupy opposite (para-) positions in the six-membered dioxin ring. Dibenzodioxin is the carbon ...
Dibenzazepine (iminostilbene) is a chemical compound with two benzene rings fused to an azepine ring. [1] Many pharmaceuticals, such as carbamazepine, oxcarbazepine, and depramine, are based on a dibenzazepine structure.