Investigation of the transmission of substituent effects by 29Si NMR
Abstract
Long range substituent effects on the 29Si NMR chemical shifts in a series of alkylene- and arylene-bridged triethoxysilanes were observed over as many as 11 bonds. The hydrolysis reaction of an ethoxide caused the resonance of the silicon on the opposing end of the bridging unit to move downfield. The alkylene bridging units ranged from