| 41. | Parthenolide undergoes " trans "-annular cyclization and elimination to form the guaianolide skeleton.
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| 42. | A diol can be converted to cyclic ether by using an acid catalyst, this is diol cyclization.
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| 43. | A similar reaction is the reductive cyclization of enones to form the corresponding alcohol in a stereoselective manner.
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| 44. | Squalene, through a cyclization reaction with 2, 3-oxidosqualene 6 as an intermediate forms cycloartenol.
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| 45. | The implication of different reaction is that cyclization needs to occur in a concerted step with enol formation.
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| 46. | This tunnel aided intramolecular aldol condensation provides the first cyclization when the chain is still in the tunnel.
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| 47. | Through radical cyclization a five membered ring is formed followed by the propagation of a new tin radical.
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| 48. | The ylide reacts with the electrophilic ester trap through intramolecular cyclization to form a five-membered ring.
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| 49. | The racemic synthesis involves addition / cyclization reaction of 2-amino-1-phenylethanol with cyanogen bromide.
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| 50. | However, even lab syntheses of isoquinolines has been performed by cyclization of ( acylated derivatives of ) phenethylamine.
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