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32 Cards in this Set
- Front
- Back
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Epoxide: |
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Furan:
One lone pair in P orbital, other in spy positive trivalent in resonance, hence less aromatic to pyrrole |
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Tetrahydrofuran
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Pyrrole
(excessive heterocycle- lone pair delocalises in p orbital) Aromatic |
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Pyrrolidine (non-aromatic)
Basic |
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Thiophene
Aromatic |
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Imidazole (aromatic)
pKa = 6-7 |
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Oxazole
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Pyrazole
Aromatic |
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Triazole (3 nitrogens)
Tetrazole (4 nitrogens) |
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Pyridine (aromatic)
Azomethine Nitrogen Pi- deficient heterocycle, Lone pair in sp2 orbital, inductive stronger pKa = 4-5 |
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Piperidine
Basic pKa = 9-10 |
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Pyrimidine (aromatic) (1,3)
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Piperazine (1,4)
pKa = 9-10 found in cipro derivative |
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indole ("benzopyrrole")
in L-tryptophan (amino acid) |
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Quinoline ring
in cipro derivative pKa = 4-5 |
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Isoquinoline
in Papaverine (smooth muscle relaxant) |
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Phenothiazine
in chlorpromazine (thorazine) |
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Barbiturate
not benzo-fuzed hydantoin-like |
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Morpholine
Basic |
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Pyridazine
Aromatic |
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Pyrazine
Aromatic less basic in nature than pyridine, pyridazine and pyrimidine |
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2H- Pyran (non aromatic)
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4H-Pyran (non aromatic)
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Pyrylium cation
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Quinazoline
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Purine
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Carbazole
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Pteridine
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Naphthalene
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Lactones
Cyclic Esters |
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Lactams
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