Alkylating Polymers: Resin-Released Carbenium Ions as Versatile Reactive Intermediates in Polymer-Assisted Solution-Phase Synthesis J.R. gratefully acknowledges support from Prof. M. E. Maier, Tübingen, the Strukturfonds of the University of Tübingen, and Merck KGaA, Darmstadt, Germany. J.S. received a grant from the DFG graduate college "Analytical Chemistry".