Abstract Cyclization rate constants for various 1, n-halo (alkylthio) alkanes X [sbnd](CH2) n [sbnd] S [sbnd] R with n= 4 and n= 5 were determined in CH3CN, CH2CI2, C6H14, CDCI3 and H2O/CH3CN (9: 1) at T= 25° C. The rate of formation of the five-and six-membered cyclic sulphonium salts depends on the halogen atom (I> Br> Cl), the number of methylene groups between sulphur and halogen (n= 4> n= 5), on the alkyl group R and on the ...
