Use of different conditions

To find such information using as a base only the indexes of Chemical Abstracts is a fearsome task and may verge on the impossible.  

The principal users of the present book should probably be the following the graduate student or the research chemist who may have had no personal experience in performing a particular reaction covered in this book and who would like to find quickly the details for appropriate conditions to accomplish a certain reaction which may be completely outside the steroid field the steroid chemist, who will find some very useful (and often complete) listings of topics important to his work, and who can use this material in conjunction with a complete book such as Fieser and Fieser s Steroids and, finally, that rapidly becoming extinct breed of organic chemist, the literature browser, who will encounter stimuli to ponder a multitude of unsolved problems. 

First and foremost, I must thank the authors of the chapters for having spent the better part of a pleasant California summer in the library, and two of the authors - Miss Dorothy M. Feigl and Mr. Robert H. Shapiro - for having re-typed and re-drawn the entire material in form suitable for direct reproduction. The editor and the authors are deeply grateful to the substantial number of research chemists at Syntex, S. A., The Upjohn Company, and Eli Lilly and Company, who spent maqy hours in going over this material and who provided numerous helpful comments. 

BMD bismethylenedioxy group LA(tBuO)3H lithium tri-t-butoxy aluminum 

The configuration of the hydrogen atoms at the ring junctions in the above formula will always be Sa, 9fi, sot and 140t. All other configurations will be shown as follows  

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