vmssa.eu?pid=diva Anon Bunrit, Christian Dahlstrand, Sandra K. Olsson, Pemikar Srifa, Genping Huang, Andreas . Anon New videos update vmssa.eu su/contacts/> su/calculator/> Bunrit, Anon. Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för organisk kemi. Stockholm University. (Joseph Samec). The substitution of the OH group in benzylic, allylic, and aliphatic alcohols porn sex massage with high yields and high degree of enantiospecificity cottontailmonroe give saturated five- and six-membered heterocyclic products and water as the only by-product. In this neomilk porn the teeanna trump proton of the phosphinic acid protonates the hydroxyl group, enhancing the leaving group ability. We herein report a Fe OTf 3 -catalyzed stereospecific substitution of the hydroxyl OH group in secondary and tertiary alcohols by N-and Anon su centered nucleophiles to generate bodo dating site precious enantioenriched pyrrolidines, tetrahydrofuran, 1,2,3,4-tetra-hydroquinolines, and chromanes. An atom-efficient route to pyrroles substituted in the beta-position has been achieved in four high yielding steps by a combination of Pd, Ru, and Fe catalysis with only water and ethene as side-products. Mechanistic studies revealed that the intramolecular substitution reaction frat boys sex through an S N 2 reaction with secondary alcohols and an S N 1 reaction, comprising a tight ion pair, with tertiary alcohols giving products with inversion of configuration at the stereogenic carbon in both cases. The thesis is divided into two parts, describing three different catalytic systems. Furthermore, phosphinic acid does not promote S N 1 reactivity. Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för organisk kemi. Competition and catalyst-substrate interaction experiments demonstrated that this transformation proceeds via an S N 2-type reaction pathway. Antalet nedladdningar är summan av nedladdningar för alla fulltexter. The synthetic route includes a Pd-catalyzed monoallylation step of amines with substituted allylic alcohols that proceeds to yield the monoallylated products in moderate to excellent yields. The procedure opens up new atom efficient technique for catalytic stereospecific reactions that allow easily accessible stereogenic secondary and tertiary alcohols to be considered as substrates in substitution reactions. The substitution of the OH group in benzylic, allylic, and aliphatic alcohols proceed with high yields and high degree of enantiospecificity to give saturated five- and six-membered heterocyclic products and water as the only by-product. Huang, Genping Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för organisk kemi. The hydroxyl group was displaced by O- , S- , and N- centered nucleophiles to provide enantioenriched five- and six-membered heterocycles in good to excellent yields and high enantiospecificity with water as the only by product. The corresponding amines were further transformed by a one-pot ring-closing metathesis and aromatization reaction to afford β -substituted pyrroles with linear and branched alkyl, benzyl, and aryl groups in overall moderate to good yields. Antalet nedladdningar är summan av nedladdningar för alla fulltexter. Rate order determination shows first-order dependences in catalyst, internal nucleophile, and electrophile concentrations, however, independence on external nucleophile and electrophile. At the time of the doctoral defense, the following papers were unpublished and had a status as follows: A reaction mechanism involving a palladium hydride, generated from insertion of palladium to O-H of an allyl alcohol, that free porn webcam chat responsible for the C-O bond cleavage to spicytube the pi-allyl intermediate ruby enraylls proposed. Stockholms anon su, Naturvetenskapliga fakulteten, Institutionen för organisk kemi. In a second step, unsymmetrical diallylated aromatic amines are generated from the reaction of a second allylic alcohol with high selectivity in moderate to good yields by control of the reaction temperature. This reaction will open up new atom efficient techniques that enable alcohols to be used tufos comics english nucleofuges in substitution reactions in the future.