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Fundamental studies of steroid compounds have begun approximately thirty years ago with the solution of structures of cholesterol and bile acids. This field has been receiving more attention when the structures of the principal steroid hormones, aglycones of heart glycosides, sapogenins, steroid alkaloids, toad poisons have been established. An intensive interest in these derivatives of cyc1opentanoperhydrophe nanthrene was determined especially by practical viewpoints, notably by attempts to prepare by synthetical economical procedures a series of steroid hormones and their biologically active derivatives, further by theoretical viewpoints. Biochemistry of steroids was developing in its beginnings by studies of meta bolites of steroid hormones in animal organism and soon has brought a number of practical results that could be used also in medical diagnostics. Considerably later, the metabolism of steroid compounds was followed also in microorganisms, again in connection with the practical problem to aid to economical syntheses of some steroid hormones. Two names are of primary importance for the pioneer works in microbial transformations of steroids, that of the Italian worker L. MAMOLI who first realized the microbial biosynthesis of testosterone from dehydroepiandro sterone, and of the American chemist and microbiologist D. H. PETERSON, who has contributed by his fundamental experiments in microbial hydroxylation of steroids to the position eleven, especially to the synthesis of cortisone. Microbial transforma tions of steroids nowadays offer a valuable tool in the preparation of series otherwise difficultly accessible steroid compounds.
Comprehensively researched from the 128 volumes of the reference work commonly referred to as the Official Records, this book delves deeply into the structural and statistical history of the Union army that served primarily in Tennessee, Georgia and the Carolinas during the American Civil War. Extensive details are provided regarding the army's evolving organization, its constantly fluctuating strength, and the sacrifices made during its many campaigns and battles.
This book reviews in a concise and manageable way the progress in all key areas of natural products chemistry since 1984. The most significant advances are highlighted over a wide field of chemistry, structure, synthesis and biosynthesis. This book provides a unique and superb entry into the vast literature on the subject.
While continuous processes have found widespread application within chemical production, members of the research and development communities have historically favored the centuries old technique of iterative batch reactions. With the exception of combinatorial and microwave chemistry, little had been done to change the way that synthetic chemists c