102786-83-4Relevant articles and documents
Ttrihalogenomethylsulphenylation of Tetraisopropyl Methylenebisphosphonates
Blackburn, G. Michael,Maciej, Thomas W.
, p. 1935 - 1940 (2007/10/02)
Trihalogenomethylthiomethylenebisphosphonates, 2CRSCClnF(3-n) (n = 0-2; R = H, Me), are formed by reaction of salts of tetraisopropyl methylenebisphosphonates, 2CRM (M = Li, Na; R = H, Me), with trihalogenomethanesulphenyl chlorides, CClnF(3-n)SCl (n = 0-2).The ester products are transesterified with bromotrimethylsilane and hydrolysed with aqueous methanolic sodium hydroxide to give the corresponding tetrasodium salts of the bisphosphonic acids.The sulphenylation reactions are complex and are facilitated by the use of Lewis acids.Sulphenylations using chlorodifluoro- and dichloro-methanesulphenyl chlorides afford unexpected additional produts arising from chlorine replacement by fluorine.