Search results for "4-Butanediol"
showing 2 items of 2 documents
Synthesis of molecularly uniform model oligomers for 1,5-naphthalene diisocyanate and 1,4-butanediol based polyurethanes by using the 3,5-di-tert-but…
1997
A modified benzyloxycarbonyl (BOC) protective group, the 3,5-di-tert-butyl substituted BOC (3,5-tBBOC) group, was introduced to the stepwise synthesis of molecularly uniform oligourethanes based on 1,5-naphthalene diisocyanate (NDI) and 1,4-butanediol (BDO) for the protection of the amino functions of the starting material 1,5-naphthalene-diamine (NDA). The tert-butyl substituents of the 3,5-tBBOC group significantly improved the solubility of the intermediate products in the oligourethane synthesis. Thus, applying this modified protective group, reactions could be carried out, which were not possible with the conventional BOC group, due to the insolubility of the compounds in all suitable …
Cyclodehydration of Diols in Acidic Ionic Liquids
2011
Cyclodehydration of Diols in Acidic Ionic Liquids In the presence of sulfonic acid group functionalized Bronsted-acidic ionic liquids, cyclodehydration of 1,2-ethanediol and 1,4-butanediol is investigated. The role of structure and catalytic activity of ionic liquids on the formation of cyclic ethers: 1,4-dioxane and tetrahydrofuran - is determined.