Synthetically Induced 1→4‐C Branching Motif ‐ An Access Towards Dense Urethane Connecting Dendritic Scaffolds and Application in Nuclear Track Detection

Abstract

AbstractA series of dumbbell‐shaped urethane connecting polyoleifinic dendrimers, are synthesized from commercial AB2 monomer through the concept of post‐generative synthetic induction of novel 1→4‐C branching motif in divergent and convergent growth methodology using carbamoyl chloride reactivity. A synthetic protocol is conducted through the iterative process of O‐carbamoyl‐allylation of hydroxyls followed by Upjohn dihydroxylation of the allylic double bonds, leading to protection/deprotection free divergent pathway. In parallel, convergent growth route gains dendrimers in relatively good yields. Also, the process of O‐carbonyloxy‐allylation of [G‐1] polyol affords urethane‐carbonate framework providing access to 1→2‐C branching further. Incorporation of current branching motif results in dendritic scaffold with dense periphery at lower generations itself. Free radical cast polymerization of [G‐0.5] dendrimer with allyl diglycol carbonate (ADC) produces thermoset polymer films, showing good sensitivity and ability to permanently record nuclear tracks.