Plural Ring Oxygens In The Hetero Ring (e.g., 1,2-dioxin, Etc.) Patents (Class 549/357)
- Tricyclo ring system having the hetero ring as one of the cyclos (Class 549/359)
- Bicyclo ring system having the hetero ring as one of the cyclos (Class 549/362)
- The two cyclos share at least three ring members (i.e., bridged) (Class 549/363)
- Three or more ring oxygens in the bicyclo ring system (Class 549/364)
- The ring oxygens are in the 1,2- or 1,3-positions of the hetero ring (Class 549/365)
- Nitrogen attached indirectly to the hetero ring by acyclic nonionic bonding (Class 549/366)
- Plural hetero rings (Class 549/370)
- Nitrogen bonded directly to the hetero ring (Class 549/371)
- Chalcogen or -C(=X), wherein X is chalcogen, bonded directly to the hetero ring (Class 549/372)
- Nitrogen attached indirectly to the hetero ring by nonionic bonding (Class 549/373)
- Chalcogen attached indirectly to the hetero ring by nonionic bonding (Class 549/374)
- Preparing by reacting an aldehyde with a compound containing acyclic carbon to carbon unsaturation (Class 549/376)