Chelation controlled regioselective alkylation and 1,4 chirality transfer in optically active 1-alkoxy-1,4-cyclohexadienes

Chelation controlled alkylation of optically active 1-alkoxy-1,4-cyclohexadienes leads to a mixture of 1,4-cyclohexadienes 4a-c and 1,3-cyclohexadienes 5a-c. The regio- and diastereoselectivities depend upon the nature of the chiral auxiliary and the reaction conditions. Regio- and diastereoselectivities depend upon the nature of the chiral auxiliary and the reaction conditions (e.g. < 99 % regio- and 60 % diastereoselectivity for R5, R4 = i-Pr in Et2O)

Surface modification of cellulosic non-woven with sustainable nanotechnologies

Abstract: As an alternative for traditional chemical grafting techniques controlling surface properties of a cellulosic non-woven, the physical absorption of organic nanoparticles can be favourably applied for selective surface modification. This method offers benefits of a better control over the chemical composition and dosage of the chemical compounds, as they can be formulated independently from the fiber substrate. Good adhesion between the nanoparticles and the cellulose fiber was managed by dedicated chemical synthesis and positioning of functional groups over the nanoparticle surface, tuning the interactions with the cellulosic hydroxyl groups. Moreover, the combination of morphological and chemical surface changes is favourable to add specific functionalities, including adhesion, friction and wettability. As the continuous strife for design of sustainable materials requires limited usage organics and reduction in petroleum-based derivatives, our method is based on aqueous dispersions that incorporates high amounts of renewable oils