This account outlines the results obtained in the author's laboratory
in the field of mixed organophosphorus-sulfur compounds with a special
emphasis on their synthetic applications. General approaches to funct
ionalized cyclopent-2-en-1-ones and cyclopentanones using new phosphor
us and sulfur reagents are presented. The synthetic value of these met
hods is demonstrated by the total synthesis of dihydrojasmone, methyle
nomycin B, sarkomycin and isoterrein.