01187nas a2200205   4500008004100000022001400041245009400055210006900149260011000218300001400328490000700342520038200349100001600731700002300747700001900770700002200789700002500811700002600836856011900862       2016                        eng d  a1359-734500aAmmonium catalyzed cyclitive additions: evidence for a cation-pi interaction with alkynes0 aAmmonium catalyzed cyclitive additions evidence for a cationpi i  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcDEC  a2311-23130 v523 a<p>The addition of carbamate nitrogen to a non-conjugated carbon-carbon triple bond is catalyzed by an ammonium salt leading to a cyclic product. Studies in homogeneous systems suggest that the ammonium agent facilitates nitrogen-carbon bond formation through a cation-p interaction with the alkyne unit that, for the first time, is directly observed by Raman spectroscopy.</p>1 aNagy, Edith1 aSt Germain, Elijah1 aCosme, Patrick1 aMaity, Pradip, K.1 aTerentis, Andrew, C.1 aLepore, Salvatore, D.  uhttps://library.ncl.res.in/content/ammonium-catalyzed-cyclitive-additions-evidence-cation-pi-interaction-alkynes-0