Chromatographic separation of putative precursors of cholestanol
This paper describes convenient syntheses for labeled and unlabeled cholest-5-en-3-one, cholest-4-en-3-one, epicholesterol, cholest-4-en-3 beta-ol, and cholest-4-en-3 alpha-ol. The thin-layer chromatography, high-performance liquid chromatography, and gas-liquid chromatography of these compounds and of cholestanol and epicholestanol are also described. The synthesized compounds are potential precursors in the biosynthesis of cholestanol in mammals.
A facile synthesis of (3α-3H]β-sitosterol
Direct oxidation of the parent sterol using CrO3 provided (24R)-24-ethyl-5-cholesten-3-one which on treatment with NaBT4 gave [3 alpha-3 H] (24R)-24-ethyl-5-cholesten-3 beta-ol. Purification at each stage afforded samples which were compared spectrally with the corresponding cholesterol series compounds.
Timber, its nature and behaviour
Preface. Acknowledgements. Chapter 1 - Structure of Timber. Chapter 2 - Appearance of Timber in Relation to its Structure. Chapter 3 - Mass Volume Relationships. Chapter 4 - Movement in Timber. Chapter 5 - Flow in Timber. Chapter 6 - Deformation Under Load. Chapter 7 - Strength and Failure in Timber. Chapter 8 - Durability of Timber. Chapter 9 - Processing of Timber. Index.