01707nas a2200169   4500008004100000022001400041245016900055210006900224260011000293300001400403490000600417520091300423100002201336700002201358700002901380856012801409       2015                        eng d  a2044-475300aHighly efficient triphenyl(3-sulfopropyl)phosphonium functionalized phosphotungstic acid on silica as a solid acid catalyst for selective mono-allylation of acetals0 aHighly efficient triphenyl3sulfopropylphosphonium functionalized  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcMAY  a4039-40470 v53 a<p>Silica supported phosphotungstic acid functionalized with triphenyl(3-sulfopropyl)phosphonium (PW-Si/TPSP) was developed as a solid acid catalyst for C-C bond formation via Hosomi-Sakurai allylation of acetals. Functionalization of PW as well as its binding to silica was confirmed by solid state P-31-NMR and Si-29-NMR, respectively. Among the various catalysts prepared, the 30% PW loaded (30PW-Si/TPSP) catalyst gave an excellent yield of homoallyl ethers (HAEs) via selective mono-allylation of acetals with allyltrimethylsilane. A plausible reaction pathway has also been proposed in which the strong Bronsted acid sites of 30PW-Si/TPSP play an important role in activating the acetals to form the corresponding oxonium cations. The versatility of our catalyst was demonstrated for the allylation of a wide variety of acetals while its stability was established in five successful recycling runs.</p>1 aKamble, Sumit, B.1 aShinde, Suhas, H.1 aRode, Chandrashekhar, V.  uhttps://library.ncl.res.in/content/highly-efficient-triphenyl3-sulfopropylphosphonium-functionalized-phosphotungstic-acid-0