A compound related to Lawesson's reagent
has been formed by the reaction of 1-bromonaphthalene
with P<sub>4</sub>S<sub>10</sub>, this is a 1,3,2,4-dithiadiphosphetane 2,4-disulfide which has a naphth-1,8-diyl group holding the two phosphorus atoms
together. The mechanism by which the NpP<sub>2</sub>S<sub>4</sub> forms is unclear, but it is thought to occur through some free radical
process, and naphthalene
has been detected as a side product in its synthesis. In general NpP<sub>2</sub>S<sub>4</sub> has been found to be less reactive than Lawesson's reagent, this result agrees with the hypothesis
that the dithiophosphine ylides
are responsible for the majority of the chemical reactions of the 1,3,2,4-dithiadiphosphetane 2,4-disulfides.
It has been found that NpP<sub>2</sub>S<sub>4</sub> reacts with many hydroxyl compounds, for instance methanol
, ethylene glycol
and a catechol
to form species with oxygen
atoms bonded to the phosphorus atoms.
Methanol reacts to form compound which has one O-methyl and one S-methyl bonded to the two phosphorus atoms. Read More