Preparation of heterocyclic carbon compounds with only O, N, S, Se or Te as ring hetero atoms (C12P13/04 - C12P13/24 take precedence)

Child Classifications

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• C12P 17/02 Oxygen as only ring hetero atoms
• C12P 17/10 Nitrogen as only ring hetero atom
• C12P 17/14 Nitrogen or oxygen as hetero atom and at least one other diverse hetero ring atom in the same ring
• C12P 17/16 containing two or more hetero rings
• C12P 17/18 containing at least two hetero rings condensed among themselves or condensed with a common carbocyclic ring system, e.g. rifamycin