Compound A-S-B (neutral) was discovered in a photochemical cell where compound [A]+I- was used as a catalyst. We can prepare compound both [A]I and B (neutral) separately. Now, How can I make a sulfur bridge between them?
Dear Atahar Rabby unfortunately your question is a bit too general and unspecific to provide you with a really qualified answer. I don't see an immediate way to make the sulfur-bridged compound directly from the iodide precurspr [A]I and neutral B plus a sulfur source. What would be necessary is to prepare an anionic species of the type B-S– which could then react with the iodide. In any case it would be helpful to know more specifically which compounds you are talking about.
We can make a sulfur bridge between two compound by reacting alkyl/aryl mercaptans with alkyl or aryl halides using aque. NaOH as a catalyst. It is similar to Williamson,s ether synthesis.
Dear Madhukar Baburao Deshmukh yes, I fully agree with you in that this is the established standard method fir making diorganosulfides, R–E–R'. In any case you have to employ a base to generate to anion of the mercaptan.