Výsledky vyhledávání - "L R, Subramanian"

Nitroso compounds. Part XXI: Photolysis of gem-chloronitrosoadamantane in benzene and in alcohols

Autor: A. H. M. Kayen, Th. J. de Boer, L. R. Subramanian

Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 90:866-873

Photolysis in benzene of gemchloronitrosoadamantane-a model compound with no “active” α-hydrogen - yields adamantanone (51%) and gem-dichloro-adamantane (44%). In hydrogen-donating solvents like methanol or isopropanol the dichloro derivative is

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::271098c15e2fbe255e6dbae77b134a8b
https://doi.org/10.1002/recl.19710900806

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Synthesis, Characterization, and Optical-Limiting Properties of Axially Substituted Gallium(III) Naphthalocyanines

Autor: Osamu Ito, Yu Chen, Michael Hanack, Werner J. Blau, Mamoru Fujitsuka, L. R. Subramanian, Sean M. O'Flaherty

Publikováno v: Chemistry of Materials. 14:5163-5168

The soluble axially substituted naphthalocyanine monomers, tBu4NcGaCl (1) and tBu4NcGa(p-TMP) (p-TMP = p-trifluoromethylphenyl) (2) and the μ-oxo-bridged naphthalo-cyanine dimer [tBu4NcGa]2O (3) are synthesized under mild conditions. In comparison t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4dcf495174c15c6f39a98b14772c609e
https://doi.org/10.1021/cm021257u

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An easy one-step synthesis of 4-alkoxypyrimidines from aliphatic esters and nitriles

Autor: M. D. Molero Vilchez, R. Martinez Alvarez, L. R. Subramanian, A. Herrera Fernández, A. Garcia Martinez, M. L. Laorden Gutierrez

Publikováno v: Tetrahedron. 55:4825-4830

The reaction of aliphatic esters with aliphatic or aromatic nitriles in the presence of trifluoromethanesulfonic anhydride affords substituted 4-alkoxypyrimidines in good yields. A mechanism of the investigated reaction is proposed.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::68237202306e21274bf5503f1ba0a217
https://doi.org/10.1016/s0040-4020(99)00154-4

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Synthesis of homochiral 3-substituted cyclopentanones from 2-norbornanones

Autor: E. Teso Vilar, A. Garcia Martinez, S. De La Moya Cerero, A. Garcia Fraile, P. Martinez Ruiz, L. R. Subramanian

Publikováno v: Tetrahedron: Asymmetry. 7:2177-2180

The cleavage of the C 1 -C 2 bond in norbornane derivatives is accomplished by base-promoted hydrolysis of α-nitroketones, periodate oxidation or Beckmann fragmentation of suitable precursors prepared from the 2-norbornanones 1 . These reactions are

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b7bd99d113f63a1e74bda834e788c0b1
https://doi.org/10.1016/0957-4166(96)00264-9

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A facile synthesis of homochiral 1-norbornanecarboxylic acids and 1-norbornanecarbonitriles

Autor: E. Teso Vilar, L. R. Subramanian, A. Garcia Martinez, J. M. Gonzalez-Fleitas De Diego, A. Garcia Fraile, S. De La Moya Cerero

Publikováno v: Tetrahedron: Asymmetry. 5:1599-1603

A general method for the preparation of the title compounds from naturally occurring homochiral 2-norbornanones is presented. The key step is the Tf 2 O induced Wagner-Meerwein rearrangement of the corresponding cyanohydrins.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::39cb6d6986d9890673141a687924de24
https://doi.org/10.1016/0957-4166(94)80130-4

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Synthesis of homochiral 1,2-diols from (−)-fenchone and (+)-camphor

Autor: A. Garcia Martinez, E. Teso Vilar, S. De La Moya Cerero, L. R. Subramanian, A. Garcia Fraile

Publikováno v: Tetrahedron: Asymmetry. 5:1373-1376

(+)-(1 R ,2 S )-1,2-dihydroxy-7,7-dimethylnorbornane ( 3 ) and (−)-(1 R ,2 R )-1,2-dihydroxy-3,3-dimethylnorbornane ( 12 ) have been obtained from (−)-fenchone and (+)-camphor.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7c4e2ac912904888b362e01105eb1a79
https://doi.org/10.1016/0957-4166(94)80180-0

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Synthesis of homochiral cyclopentane derivatives by Beckmann fragmentation of 1-substituted 2-norbornanones

Autor: E. Teso Vilar, C. Maichle, L. R. Subramanian, S. De La Moya Cerero, A. Garcia Fraile, C. Diaz Oliva, A. Garcia Martinez

Publikováno v: Tetrahedron: Asymmetry. 5:949-954

The fragmentation of 2-norbornanone oximes 2 was achieved by reaction with Tf2O/pyridine under mild reaction conditions, yielding homochiral (or racemic) cyclopentane derivativel.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::31643754b564efd43fc4a0a41420dec0
https://doi.org/10.1016/s0957-4166(00)86247-3

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Geminal dialkylation, alkylative reduction and olefination of aliphatic aldehydes. Reaction of gem-bistriflates with higher order dialkylcyanocuprates

Autor: J. Osío Barcina, B. Ruiz Diez, A. Garcia Martinez, L. R. Subramanian

Publikováno v: Tetrahedron. 50:13231-13238

gem -Dialkylation or alkylative reduction of α-unbranched aliphatic aldehydes 1 is advantageously achieved by reaction of the corresponding gem -bistriflates 2 with di- n -alkylcyanocuprates or di- sec - and di- tert -alkylcyanocuprates respectively

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c276765ea94746f353b662fbc641e16e
https://doi.org/10.1016/s0040-4020(01)89331-5

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