Abstract
Phthiocerol B, consisting of two homologous β-diols closely related to the previously known diols CH3·[CH2]n·CH(OH)·CH2·CH(OH)·[CH2]4·CH(CH3)·CH(OCH3)·CH2·CH3, now named phthiocerol A, has been isolated, together with other products, from crude phthiocerol (obtained from human tubercle bacilli). Comparative mass spectrometric and nuclear magnetic resonance studies of phthiocerol A and B, as well as their ethylidene acetals, are described and evidence is presented that phthiocerol B is a mixture of homologues having the structure CH3·[CH2]n·CH(OH)·CH2·CH(OH)·[CH2]4·CH(CH3)·CH(OCH3)·CH3 where n is 22 and 20, respectively. High-resolution infrared studies of phthiocerol A and B are also reported.
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