All compds were analyzed for N. 6 In KBr pellets. The ir spectra of 131 aromatic Schiff bases exhibit absorption at 1613-1631) cm 1 in solid KBr and 1618-1645 cm 1 in CHC13.
The structure of carpesterol (1) has recently been shown to be (22ñ)-22-hydroxy-6-oxo-4a-methyl-5a:-stigmast-7-en-3/3-yl benzoate. The present work describes some chemical transformations of the sterol as well as its degradation to 4a-methyl-5a-stigmast-8( 14)-en-3/?-ol (10) from which the 24R configuration of the stigmasterol ethyl group was confirmed. The possible implications of 1 to the biogenesis of steroidal alkaloids and sapogenins are presented. The ORD spectra of 1 and some of its derivatives are contrasted with the spectra of the ecdysterols.
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