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Asymmetric inclusion polymerization is an excellent way for obtaining highly stereoregular and optically active polymers by "through space" asymmetric induction. 1 However, applicable monomers are so far limited to only methyl-substituted 1,3-butadienes (BO), such as 1,3-pentadiene, 2 2-methyl-1,3-pentadiene, 3 2,4-hexadiene, 4 and 1,3-cyclodienes. 5 In spite of impressive progress in asymmetric synthesis over the past decade, 6 there seem to be only a few studies on asymmetric polymerization of BO derivatives except for the inclusion method.thermally stable propagating radicals in the canals. This finding enabled us to challenge the inclusion polymerization of many diene monomers not applicable so far.In a series of extensive studies on inclusion polymerization using deoxycholic acid (OCA, I) and apocholic acid (ACA, II) as the host molecules, we showed that even butadiene monomers with bulky and/or polar substituent groups can be polymerized in the canals of the hosts. 7 • 8 The reason for the success lies in the possible prolonged postpolymerization due to We report here the first example of asymmetric inclusion polymerization of five prochiral monomers, that is, propyl, isopropyl, butyl, in OCA and ACA canals by long-lived propagating radicals. ESR observation of the propagating radicals is also described.

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