Zobrazeno 1 - 10
of 38
pro vyhledávání: '"John D. Spence"'
Autor:
Terell E. Keel, Morgan H. Daly, John D. Spence, Alondra J. Cortés, Benjamin F. Gherman, Stephanie A. Valenzuela, Zakery J. E. Tippins
Publikováno v:
The Journal of Organic Chemistry. 82:13297-13312
A combined computational and experimental study was conducted to examine the effect of extended benzannelation orientation on C1–C5 and C1–C6 cyclization of acyclic quinoxalenediynes. Calculations (mPW1PW91/cc-pVTZ//mPW1PW91/6-31G(d,p)) on termin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::82b09198da271bbb5267cfda89347805
https://doi.org/10.1021/acs.joc.7b02420
https://doi.org/10.1021/acs.joc.7b02420
Autor:
Sergio A. Toscano, John D. Spence, Miranda L. Lackie, Marilyn M. Olmstead, Nicola A. Clayton, Esfir Popova, Michelle A. Farmer
Publikováno v:
Tetrahedron Letters. 55:1569-1572
Sonogashira coupling of buta-1,3-diynylbenzene with ((2-iodophenyl)ethynyl)trimethylsilane and 1,2-diiodobenzene led to the novel enetriyne, 1-ethynyl-2-(phenylbuta-1,3-diynyl)benzene, and enetetrayne, 1,2-bis(phenylbuta-1,3-diynyl)benzene, respectiv
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::baec0b27f7be99dd813b7734114abe58
https://doi.org/10.1016/j.tetlet.2014.01.076
https://doi.org/10.1016/j.tetlet.2014.01.076
Autor:
Ramiro Fernandez, Andro C. Rios, Megan A. Frost, Sonia Chavez, John D. Spence, Claire M. McCutcheon, Christopher D. Cox, Benjamin F. Gherman
Publikováno v:
The Journal of Organic Chemistry. 77:10329-10339
A series of [b]-fused 6,7-diethynylquinoxaline derivatives have been synthesized through an imine condensation strategy to examine the effect of extended benzannelation on the thermal reactivity of enediynes. Absorption and emission spectra of the hi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bd740d6ce5276285431f3688c225b76c
https://doi.org/10.1021/jo302009c
https://doi.org/10.1021/jo302009c
Autor:
Heather J. Walker, Trang T. Nguyen, Nadezhda V. Korovina, Michael L. Chang, Benjamin F. Gherman, Ramiro Fernandez, Marilyn M. Olmstead, John D. Spence
Publikováno v:
Organic Letters. 13:3660-3663
A series of naphthalenyl-substituted arenediynes were prepared to examine photochemical reactivity. For naphthalen-1-ylethynyl arenediyne, 350 nm photolysis resulted in a tandem [2 + 2] photocycloaddition to afford cyclobutene adducts. For naphthalen
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2296ab061106418f54c636f430d22243
https://doi.org/10.1021/ol201317w
https://doi.org/10.1021/ol201317w
Publikováno v:
Organic Letters. 11:895-898
Azacalixarenes derived from p-tert-butylphenol are generated by an intramolecular aryl amination strategy as the ring-closing step. The reaction produces the first examples of larger p-tert-butylcalixarenes with regioselective substitution of bridgin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c8f195907871c4b13b76bdc61d745fd6
https://doi.org/10.1021/ol8028912
https://doi.org/10.1021/ol8028912
Publikováno v:
Tetrahedron Letters. 48:725-728
Synthetic methodology to prepare porphyrinylethynyl enediynes has been developed. Compared to phenylethynyl derivatives, a bulky porphyrinic substituent on the alkyne significantly increases the thermal barrier toward Bergman cyclization and leads to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b02ccad4f0b1d76d818fdec5f03a0a11
https://doi.org/10.1016/j.tetlet.2006.10.164
https://doi.org/10.1016/j.tetlet.2006.10.164
Autor:
Melanie A. Muckey, John D. Spence, Gregory M. Ferrence, Timothy D. Lash, Michael J. Hayes, Lisa F. Szczepura
Publikováno v:
The Journal of Organic Chemistry. 67:4860-4874
The "3 + 1" variant of the MacDonald condensation has been shown to be an excellent methodology for synthesizing carbaporphyrins. In particular, 1,3-indenedicarbaldehyde condenses with tripyrranes in the presence of TFA to give, following oxidation w
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7564eb0f3aca69d764736abe57f831c8
https://doi.org/10.1021/jo020267b
https://doi.org/10.1021/jo020267b
Publikováno v:
Trauma Case Reports, Vol 43, Iss , Pp 100752- (2023)
Background: Penetrating trauma to the larynx is a rare phenomenon with a high risk of mortality and morbidity due to the density of vital structures in the area (Demetriades et al., 1996). Most commonly, this type of injury is due to a gunshot wound
Externí odkaz:
https://doaj.org/article/fa3579e0cc7f43e390d7b10f0b448a45
Autor:
John D. Spence, Timothy D. Lash
Publikováno v:
The Journal of Organic Chemistry. 65:1530-1539
The Soret band for porphyrins is usually observed in the near-ultraviolet at approximately 400 nm, and few examples of “nonexpanded” porphyrins with this major absorption band at values above 500 n...
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b68cd5055179e05ee208d9cd4ff0fa72
https://doi.org/10.1021/jo991730w
https://doi.org/10.1021/jo991730w
Publikováno v:
Synlett. 2000:213-216
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::74e03c3a6e4d4264bbbbcef8a88fb01b
https://doi.org/10.1055/s-2000-6504
https://doi.org/10.1055/s-2000-6504