A 10 mmol solution of Grubbs Generation 1 catalyst was prepared in distilled, degassed methylene chloride. Initiator wafers functionalized with Nb-SiCl 3 for 20 minutes under nitrogen in dry toluene were immersed in this solution in a Schlenk flask using actively flowing nitrogen when the flask was open. The substrates were left to react for 30 min. The solution was removed from the Schlenk flask using a syringe and long needle. Clean, airfree methylene chloride was added, mixed, and removed in the same way three times.