71799-32-1Relevant academic research and scientific papers
Sulfinic Acids and Related Compounds 23. Preparation of Sulfinic Acids by the Reaction of Sulfonyl Halides with Thiols
Lee, Chew,Field, Lamar
, p. 391 - 397 (2007/10/02)
The reaction of arene- and alkanesulfonyl halides with p-thiocresol in the presence of triethylamine at -76 deg C gives triethylammonium sulfinates, which after acidification afford sulfinic acids of 95 - 100 percent purity in yields of 51 - 92 percent for 18 typical representatives.The synthesis succeeds in certain instances where conventional reduction with aqueous sodium sulfite fails and in other instances often is superior.The method is rapid, mild, selective, convenient, and general, although a few limitations are reported.Characterizations of the sulfinic acids are effected by titration with aqueous sodium nitrite, by IR and 1H-NMR spectra, by preparation of either a S-benzylthiuronium salt or a p-nitrobenzyl ester and either by elemental analyses or comparison with reported melting points of the acids and derivatives as appropriate.
Nitrodiaryl sulfoxide derivatives, process for their preparation and pharmaceutical and pesticidal compositions containing them as active ingredient
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, (2008/06/13)
The invention relates to a new process for the preparation of aminodiaryl sulfoxide derivatives of the formula (I), STR1 wherein X is halogen, alkoxy having from 1 to 6 carbon atoms or a group --(N,R,R1), in which R and R1 are hydrogen or alkyl having from 1 to 6 carbon atoms, R2 is hydrogen, halogen, alkyl having from 1 to 6 carbon atoms, alkoxy having from 1 to 6 carbon atoms or phenyl or phenylthio both optionally substituted by one or more identical or different halogen(s) and/or amino group(s), and acid addition salts thereof. The compounds of formula (I) are pharmaceutically active, in particular are potent anthelmintics, or can be used as active ingredients in pesticidal compositions. The invention therefore relates to pharmaceutical and pesticidal compositions containing compounds of formula (I) or salts thereof as active ingredient. Compounds of formula (I), in which the substituents are as defined above, but if X stands for a group --N(R,R1) in which R and R1 both represent hydrogen, and X is in para-position related to the sulfoxide group, then R2 is other than hydrogen, halogen, alkyl having from 1 to 6 carbon atoms and alkoxy having from 1 to 6 carbon atoms, and the acid addition salts thereof, are new. These new compounds are also subject of the present invention.
