95932-49-3

Upstream product

• 762-04-9 phosphonic acid diethyl ester 
• 1450-31-3 Thiobenzophenon 
• 2905-52-4 bis(ethoxythiocarbonyl) sulfide 

Relevant academic research and scientific papers

SPIN ADDUCTS BETWEEN THIOKETONES AND PHOSPHORUS CENTRED RADICALS. PART II. AN ELECTRON SPIN RESONANCE STUDY OF THE ADDITION OF PHOSPHINYL, PHOSPHONYL AND THIOPHOSPHONYL RADICALS TO DIARYL AND DIALKYL THIOKETONES.

The paramagnetic adducts between a variety of phosphinyl, phosphonyl or thiophosphonyl radicals and thiobenzophenone, 9,H-xanthen-9-thione, 9,H-thiaxanthen-9-thione, 9,H-selenaxanthen-9-thione and di-tert-butyl thioketone have been generated and studied by means of ESR spectroscopy.Attention has been focused on the variations of a(31P) with the nature of the ligands L in the attacking .PLn radicals and with the nature of the thiocarbonylic substrates.In all cases the reactions with the precursors of phosphinyl radicals afforded, beside the expected adducts, additional paramagnetic species, identified as the corresponding phosphonyl and thiophosphonyl adducts: while the formation of the former reflects the high sensitivity of tervalent phosphorus compounds to oxidizing agents, the latter adducts are believed to oroginate from desulfuration of the thioketones by the starting phosphines.

AN ELECTRON SPIN RESONANCE STUDY OF THE REACTIONS OF PHOSPHORUS CENTERED RADICALS WITH THIOKETONES

The utility of thioketones as traps for intermediate phosphorus-centered radicals is illustrated by an e.s.r. study of the phosphorus-thioketone radical adducts.The direct evidence of the P-S bond formation in the adduct is clearly supported by the large phosphorus hyperfine splittings which vary with the nature of the organophosphorus moiety.The method also readily detects in the organophosphorus compounds which are susceptible to thermal oxidation.The direct photochemical reactions of thioketones with dialkoxyphosphites are shown to involve free radical mechanisms.