Chemistry Reference
In-Depth Information
16.2 SYNTHESES OF PHOSPHORUS-CONTAININGDENDRIMERS
Besides our own work, a few other groups have reported the synthesis of phosphorus-
containing dendrimers. We havementioned in the introduction the poly(phosphonium)
dendrimers proposed by Engel and coworkers [5]. This first two-step method consists
of the cleavage of ether linkages byMe
3
SiI to afford an alkyliodide, which is used in the
second step for alkylating a phosphine possessing three ether groups. This process was
applied up to the third generation (dendrimer
1-G
3
), and it allows multiplying by 3 the
number of end groups at each generation (instead of 2 in most cases) (Figure 16.1).
Small poly(phosphine) dendrimers were reported by DuBois and coworkers [7]; they
were obtained by a radical addition of primary phosphines to the vinyl group of
FIGURE 16.1
Chemical structures of various types of phosphorus dendrimers.
