| 31. | The pyrrole synthesis requires a primary amine under similar conditions, or ammonia ( or ammonia precursors ) can be used.
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| 32. | Alternatively, dipyrromethenes are prepared directly by reacting a pyrrole with an activated carboxylic acid derivative, usually an acyl chloride.
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| 33. | Two molecules of dALA are then combined by porphobilinogen synthase to give porphobilinogen ( PBG ), which contains a pyrrole ring.
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| 34. | Compounds analogous to thiophene include furan ( C 4 H 4 O ) and pyrrole ( C 4 H 4 NH ).
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| 35. | It is also possible to use activated phenyl groups and electron-rich heterocycles such as furan, pyrrole, and thiophene.
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| 36. | When researching pyrrole ring of structure K in fig . 4 was replaced by a series of aromatic systems having various substitution patterns.
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| 37. | These are compounds containing an indole moiety, which consists of pyrrole ring fused to benzene to form 2, 3-benzopyrrole.
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| 38. | This porphyrin ring consists of four pyrrole molecules cyclically linked together ( by methine bridges ) with the iron ion bound in the center.
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| 39. | The Knorr pyrrole synthesis, reported by Knorr in 1884 is the synthesis of a substituted pyrrole from an amino-ketone and a ketone.
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| 40. | The Knorr pyrrole synthesis, reported by Knorr in 1884 is the synthesis of a substituted pyrrole from an amino-ketone and a ketone.
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