Polyacetal with other functional group

Polyacetals with other functional groups are prepared by the reaction of substituted polyols or aldehydes with each other as show in Eq. (24). 

TABLE V Preparation of Polyacetals with Other Functional Groups... 

Use of acetal/ketal monomers with reactive polymerizable functionality allows easier access to families of related polyacetals. This facilitates determination of structure-activity correlations that influence many properties including hydrolysis half-life. Hydrolytic stability is often a function of whether the degradable unit is a ketal or acetal, along with other features of the polymer structure (e.g., hydrophilicity or neighboring group effects). The use of a polymerizable bis-diene Michael acceptor as an A-A mono-... 

Although less frequently than with polyesters, it is possible to produce other polymers from ADMET polymerisation. Mecking and co-workers [44] described the synthesis of polyacetals and polycarbonates (PC) with a sparse and systematically varied density of functional groups generated by ADMET copolymerisation of unfunctionalised undeca-1,10-diene with bis(undec-10-en-l-yloxy)methane or di(undec-lO-en-l-yl) carbonate, followed by exhaustive hydrogenation (Scheme 5.10). 

In the meantime it was discovered that acyl carrier proteins with 4 -phosphopante-theine as functional group represent also essential constituents of multienzyme systems involved in the biosynthesis of other polyacetate compounds, like 6-methyl-salicylic acid,< > in nonribosomal cyclic peptide biosynthesis and in the enzymic cleavage of citrate by citrate lyase. These observations opened a broad new field of research in sulfur biochemistry. 

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