118863-87-9Relevant academic research and scientific papers
Benzothiadiphosphole as phosphorus donating reagent for a new route to 2H-1,2,3-diazaphosphole derivates
Baccolini,Orsolan,Mezzina
, p. 447 - 450 (2007/10/02)
Conjugated azoalkenes 2 react at reflux toluene with fused benzothiadiphosphole 1 (or 4) to give the diazaphosphole 3 in 25-52% yields. With this route it is possible to isolate the so far unknown 3a which is difficult to obtain in other reported conditions. The P atom involved in this cydoaddition is the one between the two S atoms.
ROLE OF PHOSPHORUS ADDUCTS IN THE INDOLIZATION REACTION BETWEEN ARYLHYDRAZONES AND PHOSPHORUS TRICHLORIDE
Baccolini, Graziano,Dalpozzo, Renato,Errani, Ermanno
, p. 2755 - 2760 (2007/10/02)
The reaction between arylhydrazones and PCl3 can give both diazaphospholes and indoles, via a common hypothetical diazaphospholine intermediate.The product ratio depends on the reaction conditions.In particular when a solvent which dissolves the phosphorus adducts is employed, indole is the almost exclusive reaction product.A mechanism is suggested for the whole indolization reaction.It involves an acid promoted cleavage of the P-N bond of the diazaphospholine to give intermediates similar to those of the accepted Fischer indolization mechanism, where the dichlorophosphino group, substituting a hydrogen atom should have an important ro le in promoting of the loss of the amino group in the last stage of the reaction, via a "Wittig-like" elimination of Cl2PNH2.
