Bromofluorination of bis(allyl)polyoxyethylene glycol ethers

NMR/Binomial Theorem Determination of the Number and the Proportions of Isomers of Poly(identical) Spaced Functional Group Substrate Reactions

“…There are some experimental results of our previous works, justifying this later calculation for elimination (Mekni et al, 2002;Mekni, 2014) and addition (Mekni et al, 2000) reactions (Table I). The integration of 1 H or 19 F NMR signals followed by the application of the binomial theorem allows the determination of the number of products and their proportions.…”

“…The results of the latter reaction (Scheme 4) are not well significant in term of the proportions because there are simultaneous degradation reactions (Mekni et al, 2000). But, they confirm clearly the formation of the mixed product theoretically expected product.…”

Addition of Perfluoroalkylethane Thiols to Bis(Propargyl) Polyoxyethylene Ethers: Synthesis of Tetrakis-(F-Alkylethanethio) Polyoxyethylene Ethers

“…The separation of the two asymmetric centers of the molecule by the polyoxyethylene ether chain renders the interaction between these two sites negligible in a manner that they can be considered as two independent asymmetric centres and NMR spectroscopy is therefore expected to be unable to distinguish between the two diastereoisomers. 17 The coexistence of four F-alkylated chains and four sulfur atoms linked to a modulable polyoxyethylene chain may be the origin of the interesting applications associating the well-known proprieties of highly fluorinated compounds 18,19 to those related to the existence of sulfur atoms.…”

Cu+‐catalyzed 1,3‐Dipolar Intramolecular Click Opposite Cross Cyclization Reaction of Polyoxyethylene Bis(azido‐terminal alkynes): Synthesis of New 1,2,3‐Triazolo‐crown Ethers

“…Herein, we attempt to synthesis bicyclic crown ethers similar to the cryptands through the opposite cross‐reaction of two azide/alkyne functional groups spaced by variable length polyoxyethylene chains (Fig. ).…”