 Use of a sulfoxonium allows more facile preparation of the reagent using weaker bases as compared to sulfonium ylides . ( The difference being that a sulfoxonium contains a doubly bonded oxygen whereas the sulfonium does not . ) The former react slower due to their increased stability . In addition , the dialkylsulfoxide by @-@ products of sulfoxonium reagents are greatly preferred to the significantly more toxic , volatile , and odorous dialkylsulfide by @-@ products from sulfonium reagents . 
 Use of a sulfoxonium <a href='uninflect' title='1'><mark>allows</mark></a> more facile preparation of the reagent using weaker bases as compared to sulfonium ylides . ( The difference being that a sulfoxonium <a href='uninflect' title='2'><mark>contains</mark></a> a doubly bonded oxygen whereas the sulfonium <a href='uninflect' title='3'><mark>does</mark></a> not . ) The former react slower due to their increased stability . In addition , the dialkylsulfoxide by @-@ products of sulfoxonium reagents are greatly preferred to the significantly more toxic , volatile , and odorous dialkylsulfide by @-@ products from sulfonium reagents . 
Use of a sulfoxonium allow more facile preparation of the reagent using weaker bases as compared to sulfonium ylides . ( da difference bein dat a sulfoxonium contain a doubly bonded oxygen whereas the sulfonium do not . ) Tdaformer react slower due to their increased stability . In addition , thdaialkylsulfoxide by @-@ products of sulfoxonium reagents are greatly preferred to the significantly more toxic , volatile , and odorous dialkylsulfide by @-@ products from sulfonium reagents .