ChemInform Abstract: Dithioacids of Phosphorus with Sterically Hindered Groups.

Reactions of dithioxo-1,3,2?5,4?5-dithiadiphosphetanes with antimony(III) alkoxides

“…This is due to the increase of the chelating nature of the ligands as the amounts of the P-O bonds are increased. Moreover, the 31 P NMR spectra of 3a-c in benzene solutions show a low field shift of d of about 4.9-5.6 with respect to the corresponding free (Oalkyl)aryldithiophosphonic acids 6a-c that were obtained by treatment of 1a,b with the corresponding alcohols [19,20]. S-Antimony(III) aryldithiophosphonate 3c was formed as a mixture of diastereoisomers, there being four chiral centers (three number 2-carbon atoms of three sec-butyl groups and the phosphorus atom).…”