Chemisorption of cycloalkenes on metal surfaces are followed by dehydrogenation processes' that often give chemisorbed C, H, species, eg, cyclohexene-benzene'-, and cyclooctadienecyclmtatetraene.'Because these transformations are facile, we have been exploring the reactions of organosilanes with singlecrystal metal surfaces4 as routes to compounds in which there are Si-C bonds of multiple bond order. With platinum and ...