Abstract
The linking mode between sugar units in biopolymers such as polysaccharides or oligonucleotides has recently gained increased attention. For example, neutral analogues of phosphodiester linkages have been designed to produce modified DNA fragments2 or nucleic acid mimics with promising properties in the control of gene expression.3 A recent focus has been directed towards neutral and achiral linkers like ethylene glycol, propoxy4 or longer alkyl chains5 but also the simple methylene group.6 In the latter case, the methylene linker was part of a formacetal moiety. 1. Dedicated to Prof. Dr. Hans Paulsen on the occasion of his 75th birthday
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