124,551 research outputs found
Ruthenium-catalyzed direct C-H amidation of arenes including weakly coordinating aromatic ketones
No full textC-H activation: The ruthenium-catalyzed direct sp2 C-H amidation of arenes by using sulfonyl azides as the amino source is presented (see scheme). A wide range of substrates were readily amidated including arenes bearing weakly coordinating groups. Synthetic utility of the thus obtained products was demonstrated in the preparation of biologically active heterocycles. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.11211201sciescopu
Symplocarpus koreanus J. S. Lee, S. H. Kim & S. C. Kim 2021
No full textSymplocarpus koreanus J.S. Lee, S.H. Kim & S.C. Kim (2021: 2) Isotype: KOREA, Gangwon-do: Chuncheon-si, Sabuk-myeon, Goseong-ri, Mt. Yonghwasan, 21 March 2020, S. C. Kim 200321500 (NIBRVP815477; Fig. 1 -23). Paratypes: KOREA, Gyeonggi-do: Gapyeong-gun, Buk-myeon, Baekdun-ri, Mt. Yeoninsan, 3 May 2013, W. B . Lee s.n. (NIBRVP517078); Gapyeong-gun, Oeseo-myeon, Mt. Hwayasan, 26 June 2007, W. K. Paik VP-KB-377062-0173 (NIBRVP815507); Gapyeonggun, Sang-myeon, Haenghyeon-ri, Mt. Chungnyeongsan, 31 March 2012, J. H . Kim, Y. J. Kim & I. S. Yoon KIMJH12006 (3 sheets, NIBRVP355001); Gapyeong-gun, Sang-myeon, Haenghyeon-ri, Mt. Chungnyeongsan, 29 March 2016, G. H . Nam, J. H. Kim & J. K. Hong L 16001 (NIBRVP550794); Gapyeong-gun, Seorak-myeon, Mt. Yumyeongsan, 4 April 2008, B. K . Kwon 080404-375 (NIBRVP532404); Gapyeong-gun, Seorak-myeon, Mt. Yumyeongsan, 4 April 2008, G. Y . Chung ANH-en-080404- 001 (NIBRVP197125); Hanam-si, Baealmi-dong, Mt. Geomdansan, 3 April 2007, J. O . Hyun, H. K. Park & J. A. Eom VP-NAPI-377054-092 (NIBRVP111433); Namyangju-si, Hwado-eup, Mt. Cheonmasan, 15 April 2007, W. K . Paik VP-KB-377061-0133 (NIBRVP815506); Namyangju-si, Hwado-eup, Mt. Cheonmasan, 22 March 2013, Song et al. s.n. (NIBRVP464822); Namyangjusi, Onam-eup, Onam-ri, Mt. Cheonmasan, 6 April 2009, G. H . Nam, M. H. Kim & J. H. Lee VS 15 (NIBRVP206699); Namyangjusi, Onam-eup, Onam-ri, Mt. Cheonmasan, 6 April 2009, G. H . Nam, M. H. Kim & J. H. Lee VS16 (2 sheets, NIBRVP206700); Namyangju-si, Mt. Chungnyeongsan, 28 March 1999, S. P . Hong & K. W. Park 411 (NIBRVP102296). Gangwon-do: Cheorwon-gun, Geunnam-myeon, Mt. Gwangdeoksan, 12 May 1997, S. P . Hong & H. S. Choi 99 (NIBRVP102297); Donghae-si, Bugok-dong, Mita Temple, 26 April 2011, G. H . Nam & W. J. Jeong SHY2-34 (NIBRVP284290); Gangneung-si, Wangsan-myeon, Mt. Hwaranbong, 30 April 2009, J. H . Kim & H. J. Kim VP-KB-0904-0071 (NIBRVP318582); Hwacheon-gun, Mt. Baekjeoksan, 24 May 2000, K . Ch. Yang & J. D. Jung s.n. (NIBRVP102304, NIBRVP102305); Hwacheon-gun, Mt. Baekjeoksan, 3 August 2000, J. H . Kim & D. K. Kim 49 (NIBRVP102307); Hwacheon-gun, Sanae-myeon, Mt. Gwangdoeksan, 7 April 2009, G. H . Nam, M. H. Kim & J. H. Lee VS24 (2 sheets, NIBRVP206708); Hwacheon-gun, Sanae-myeon, Mt. Gwangdoeksan, 7 April 2009, G. H . Nam, M. H. Kim & J. H. Lee VS25 (2 sheets; NIBRVP206709). Chungcheongbuk-do: Danyang-gun, Gagok-myeon, Mt. Sobaecksan, 17 May 1999, C. W . Park, H. W. Lee & J. Koh 10315 (NIBRVP815505); Danyang-gun, Gagok-myeon, Mt. Sobaeksan, 20 April 2007, G. Y . Chung ANH-en-070420-013 (NIBRVP121631). Jeollabuk-do: Jangsu-gun, Gyenam-myeon, Jangan-ri, 21 September 1997, B. Y . Sun & C. H. Kim 10361 (NIBRVP815504); Jangsu-gun, Gyenam-myeon, Mt. Jangansan, 19 May 2007, B. Y . Sun 2271 (NIBRVP128343); Jangsu-gun, Gyenam-myeon, Mt. Jangansan, 19 June 2009, J. K . Ahn, S. J. Lee & Y. W. Lee CH 40006 (NIBRVP266477); Jangsu-gun, Gyenammyeon, Mt. Jangansan, 19 June 2009, J. K . Ahn, S. J. Lee & Y. W. Lee CH 40239 (NIBRVP266707); Jinan-gun, Jucheon-myeon, Daebul-ri, Mt. Unjangsan, without date, C. H . Kim & S. H. Lee 50051 (3 sheets, NIBRVP537859). Gyeongsangnam-do: Geochanggun, Buksang-myeon, Mt. Deogyusan hyangjeokbong-satgatgoljae, 31 May 2006, B. Y . Sun 1577 (4 sheets, NIBRVP119643). Note: The holotype is deposited in SKK.Published as part of Jang, Hyun-Do, Hyun, Chang-Woo, Ryu, Seah & Lee, Sang-Jun, 2022, Type specimens of vascular plants in the herbarium of the National Institute of Biological Resources (II), pp. 229-243 in Phytotaxa 539 (3) on page 237, DOI: 10.11646/phytotaxa.539.3.2, http://zenodo.org/record/636408
DBLP-derived labeled data for author name disambiguation
No full textThis is a DBLP-derived labeled data originally created by Dr. C. Lee Giles at Penn State University and filtered for duplicate removal and error correction by Dr. Jinseok Kim at University of Michigan. For more details, see references below.1. Kim, Jinseok (2018). Evaluating author name disambiguation for digital libraries: a case of DBLP. Scientometrics. doi:10.1007/s11192-018-2824-5 2. Kim, Jinseok & Kim, Jenna (2018). The impact of imbalanced training data on machine learning for author name disambiguation. Scientometrics. doi: 10.1007/s11192-018-2865-9Each row refers to an author name instance with following feature information separated by tab.author name: full name string extracted from DBLPunique author id: labels assigned manually by Dr. C. Lee Giles's teampaper id: assigned by Dr. Jinseok Kimauthor list: names of authors in the byline of the paperyear: publication yearvenue: conference or journal namestitle: stopwords removed and stemmed by the Porter's stemmerIf you want to use this dataset, please consider to cite papers below.For the original dataset: Han, H., Giles, L., Zha, H., Li, C., & Tsioutsiouliklis, K. (2004). Two Supervised Learning Approaches for Name Disambiguation in Author Citations. JCDL 2004: Proceedings of the Fourth ACM/IEEE Joint Conference on Digital Libraries, 296-305. doi:10.1145/996350.996419For the filtered dataset: 1. Kim, Jinseok (2018). Evaluating author name disambiguation for digital libraries: a case of DBLP. Scientometrics. doi:10.1007/s11192-018-2824-5 or2. Kim, Jinseok & Kim, Jenna (2018). The impact of imbalanced training data on machine learning for author name disambiguation. Scientometrics. doi: 10.1007/s11192-018-2865-9</div
Iridium-catalyzed direct C-H amidation with weakly coordinating carbonyl directing groups under mild conditions
No full textAn iridium-catalyzed direct C-H amidation of weakly coordinating substrates, in particular of those bearing ester and ketone groups, under very mild conditions has been developed. The observed high reaction efficiency was achieved by the combined use of acetic acid and lithium carbonate as additives. Copyright © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.13413811sciescopu
Effect of annealing temperature on the electrical transport properties of CaRuO3-delta thin films directly deposited on the Si substrate
No full textWe investigate the effect of annealing temperature on the preferentially (110)-oriented CaRuO3-delta, (CRO) thin films directly prepared on Si(100) substrate by rf magnetron sputtering. Crystalline quality and electrical transport properties of the CRO thin films were modified by post-annealing treatment. It was obvious that 700 degrees C post-annealing brought about excellent metallic characteristics with the elevation of carrier concentration and mobility. From this result, we suggested that enhanced (110) orientation, and the ratio of chemical composition Ru4+/Ca2+ ion were responsible for the transport properties of CRO thin film. (C) 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.‘Brain Korea 21’ project. We appreciate the measurement of transport property using a He cryostat (Korea Basic Science Institute), and also thanks to Mr. Yunseok
Kim for measuring of atomic force microscopy (KAIST)
Traceless Nucleophile Strategy for C5-Selective C-H Sulfonylation of Pyridines
No full textThe functionalization of pyridines is crucial for the rapid construction and derivatization of agrochemicals, pharmaceuticals, and materials. Conventional functionalization approaches have primarily focused on the ortho- and para-positions, while achieving precise meta-selective functionalization, particularly at the C5 position in substituted pyridines, remains a formidable challenge due to the intrinsic electronic properties of pyridines. Herein, we present a new strategy for meta- and C5-selective C-H sulfonylation of N-amidopyridinium salts, which employs a transient enamine-type intermediate generated through a nucleophilic addition to N-amidopyridinium salts. This process harnesses the power of electron donor-acceptor complexes, enabling high selectivity and broad applicability, including the construction of complex pyridines bearing valuable sulfonyl functionalities under mild conditions without the need for an external photocatalyst. The remarkable C5 selectivity, combined with the broad applicability to late-stage functionalization, significantly expands the toolbox for pyridine functionalization, unlocking access to previously unattainable meta-sulfonylated pyridines.,We developed an efficient strategy for meta- and C5-selective C-H sulfonylation of pyridines using transient enamine-type intermediates from N-amidopyridinium salts. This process utilizes EDA complexes, achieving high selectivity without external photocatalysts. Our method offers late-stage functionalization capabilities that expand the pyridine modification toolbox and provide access to challenging meta-sulfonylated pyridines. image,
Illustration of the predictive distributions for two different players (Left: J. C. Kim; Right: B. H. Lee).
No full textIllustration of the predictive distributions for two different players (Left: J. C. Kim; Right: B. H. Lee).</p
Visible-Light-Induced Pyridylation of Remote C(sp3)?H Bonds by Radical Translocation of N-Alkoxypyridinium Salts
No full textMetal-free, visible-light-induced site-selective heteroarylation of remote C(sp3)?H bonds has been accomplished through the design of N-alkoxyheteroarenium salts serving as both alkoxy radical precursors and heteroaryl sources. The transient alkoxy radical can be generated by the single-electron reduction of an N-alkoxypyridinium substrate by a photoexcited quinolinone catalyst. Subsequent radical translocation of the alkoxy radical forms a nucleophilic alkyl radical intermediate, which undergoes addition to the substrate to achieve remote C(sp3)?H heteroarylation. This cascade strategy provides a powerful platform for remote C(sp3)?H heteroarylation in a controllable and selective manner and is well suited for late-stage functionalization of complex bioactive molecules. ⓒ 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinhe
Visible-Light-Induced Pyridylation of Remote C(sp<sup>3</sup>)−H Bonds by Radical Translocation of N-Alkoxypyridinium Salts
No full textMetal-free, visible-light-induced site-selective heteroarylation of remote C(sp3)−H bonds has been accomplished through the design of N-alkoxyheteroarenium salts serving as both alkoxy radical precursors and heteroaryl sources. The transient alkoxy radical can be generated by the single-electron reduction of an N-alkoxypyridinium substrate by a photoexcited quinolinone catalyst. Subsequent radical translocation of the alkoxy radical forms a nucleophilic alkyl radical intermediate, which undergoes addition to the substrate to achieve remote C(sp3)−H heteroarylation. This cascade strategy provides a powerful platform for remote C(sp3)−H heteroarylation in a controllable and selective manner and is well suited for late-stage functionalization of complex bioactive molecules.
Revisiting Arene C(sp2)−H Amidation by Intramolecular Transfer of Iridium Nitrenoids: Evidence for a Spirocyclization Pathway
No full textTwo mechanistic pathways, that is, electrocyclization and electrophilic aromatic substitution, are operative in most intramolecular C−H amination reactions proceeding by metal nitrenoid catalysis. Reported here is an alternative mechanistic scaffold leading to benzofused δ-lactams selectively. Integrated experimental and computational analysis revealed that the reaction proceeds by a key spirocyclization step followed by a skeletal rearrangement. Based on this mechanistic insight, a new synthetic route to spirolactams has been developed. © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinhe
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