Second generation polyol

The hydrosilylation-allylation protocol is applicable to the syntheses of dendritic polyols . The hydroboration-oxidation of G0-G3 dendrimers prepared in accordance with the synthetic routes shown in Scheme 24 give the corresponding dendritic polyols, GO-OH-G3-OH, which are characterized by H NMR and MALDI-TOF analyses. Further modifications of the dendritic polyols with cholesteryl chloroformate yield unique dendrimers possessing 12, 36 and 108 cholesteryl units, providing the first examples of flexible dendrimers substituted with rigid mesogenic units that are expected to have unusual liquid crystalline properties . The second generation polyol dendrimer 264... 

Second-generation solventless polyurethane adhesives Two-component second-generation adhesive systems are the most widely used of the 100% solids products. These two-part adhesives comprise an isocyanate terminated prepolymer based on the reaction product normally of MDI and polyols (polyether or polyester) in the presence of excess isocyanate, and a polyol (polyether or polyester based). 

Thus, by the reaction of TMP with 3 mols of glycidol a hexafunctional polyol is obtained (first generation) and by the reaction of this with 9 mols of PO, a polyol with 12 hydroxyl groups/mol is obtained (second generation) as shown in reaction 19.8. 

Laprol 3503 belongs to the second generation of polyols for the production of elastic and semirigid PU foams. It has relatively high chemical activity and was specially developed with a view to improving the production of elastic molded... 

A water-soluble polysulfate carborane dendrimer containing twelve ortft( -carborane clusters (20) was synthesized from its second-generation polyalkyne dendrimer precursor by reaction with decab-orane (B,oH,4). The water solubility imparting sulfate moieties were introduced by the reaction of the precursor carborane polyol compound with chloro-sulfonic acid (Newkome et al., 1994). 

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