Hydrogen Bonding of Fluorinated Saccharides in Solution: F Acting as H-Bond Acceptor in a Bifurcated H-Bond of 4-Fluorinated Levoglucosans
作者:Bruno Bernet、Andrea Vasella
DOI:10.1002/hlca.200790196
日期:2007.10
reference compounds that can only form a bivalent H-bond from HOC(2) to OC(5). They were synthesised from the iPr3Si-protected derivative of 8. Intramolecular bifurcatedH-bonds from HOC(2) to FC(4) and OC(5) of the 4-fluorinatedlevoglucosans in CDCl3 solution are evidenced by the 1H-NMR scalar couplings h1J(F,OH) and 3J(H,OH). The OH⋅⋅⋅FH-bond over an O⋅⋅⋅F distance of ca. 3.0 Å is thus formed in apolar