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Undecenyl /S-o-glycosides of glucose, galactose, and lactose have been ozonolyzed to give formylnonyl glycosides, which were reductively N-alkylated to chitosan. These chitosan derivatives, having mixed hydrophobic/hydrophilic branches, were prepared with degree of substitution values as high as 1.5. Solutions of derivatives bearing pendant monosaccharides with ds >1.0, in 1 % aqueous acetic acid, gelled upon heating to 50 °C. Lower ds samples did not exhibit this property, nor did derivatives having a disaccharide pendant residue. Further control over the properties of these derivatives was possible by preparing mixed-branched derivatives having shortand long-chain alkyl glycoside pendant groups.

Addition of the elements of 'IF' and of 'BrF' to alkenes can be effected by the in situ generation of these electrophiles from the halogen-AgF. For cyclohexene, 3,3,6,6-tetradeuterocyclohexene, methylenecyclohexane, styrene, and indene, these reactions are simple. However, for acenaphthylene, halogen–fluorine exchange and other reactions make the overall reaction quite complex. Electrophilic addition reactions for 1-fluoro-acenaphthylene are also described. The n.m.r. spectra of many of the products are given and discussed in some detail.

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