“…Interestingly, an alternative isomerization of 4 is reported for the reaction with Re(CO)5Br, which involves the 1,3-methyl migration coupled with an imino to silicon cyclization (6). 13 The alternative isomerization pathways available to 4 are likely a function of coordinative capacities of the acid initiators. In other words, preference for cyclization through sulfur may be the result of imino-A1C13 coordination, while rhenium is observed to form an adduct with the sulfur center.…”