Thiocarbonyl compounds thiol carboxylic esters

In the last decade the methods of converting carbonyl to the corresponding thiocarbonyl compounds have been substantially improved. " Therefore, thioxo- as well as dithio-carboxylic esters are accessible from esters, thiol esters and even carboxylic acids by reacting them with phosphorus pentasul-fide or 1,3,2,4-dithiadiphosphetane 2,4-disulfides such as Lawesson s or Davy s reagent (equation 4 cf. Chapter 4.1, this volume). 

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