When hexadecylsiloxane monolayers are immersed in solutions of bromine
in carbon tetrachloride and irradiated with a tungsten lamp, C-H bond
s near the surface of the monolayer undergo free-radical bromination.
The bromine introduced into the monolayers can easily be substituted b
y small nucleophiles. prepared from 16-bromohexadecyltrichlorosilane,
but with minor differences arising due to different amounts and distri
butions of bromine within the two types of monolayers.