synthesis

The synthesis of pentaprismane(1) has two currently favored syntheses stratagems, both of which use an intermediary compound known as a housane (Gribble, Hirth, 1996).

Rather than taking a trial-and-error approach based largely on intuition, he and his co-workers developed a system of logical principles -- called retrosynthetic analysis -- to help in the rational planning of chemical syntheses. Working backwards from a blueprint of the entire target compound, the researchers determine a sequence of fragmentations, which leads them to known ingredients that they then can assemble into the target structure.

In organization, the first nine chapters are devoted to thematic (ie, ring-forming) reaction types, while the last three are devoted to more specific situations (small ring syntheses, ring expansion and contraction, and transitory annulation).

Many scholars of the 1980s called from syntheses intended to link the various subdisciplines within social history and create some kind of whole out of the incredibly varied flora of research.