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Relevant bibliographies by topics / N–H bond cleavage

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Academic literature on the topic 'N–H bond cleavage'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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Journal articles on the topic "N–H bond cleavage"

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Guo, Qihang, and Zhan Lu. "Recent Advances in Nitrogen–Nitrogen Bond Formation." Synthesis 49, no. 17 (August 7, 2017): 3835–47. http://dx.doi.org/10.1055/s-0036-1588512.

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Over the last decade, N–N bond formation as a synthetic strategy has emerged as a powerful key step in the construction of highly valuable heterocycles from easily obtained materials. This review focuses on recent methods used to build N–N bonds, classified by intra- and intermolecular reactions with various types of N–X (O, C, N, H) bond cleavage.1 I ntroduction2 Intramolecular N–N Bond Formation2.1 Cleavage of N–O Bonds2.2 Cleavage of N–C Bonds2.3 Cleavage of N–N Bonds2.4 Cleavage of N–H Bonds2.4.1 Construction of Pyrazole Derivatives2.4.2 Construction of Triazole Derivatives2.4.3 Construction of Indazole and Pyrazoline Derivatives2.4.4 Construction of Other N–N Bond Derivatives3 Intermolecular N–N Bond Formation4 Conclusion

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Wang, Zhong-Xia, and Bo Yang. "Chemical transformations of quaternary ammonium salts via C–N bond cleavage." Organic & Biomolecular Chemistry 18, no. 6 (2020): 1057–72. http://dx.doi.org/10.1039/c9ob02667c.

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Yu, Yang, Gen Luo, Jimin Yang, and Yi Luo. "Theoretical studies on the N–X (X = Cl, O) bond activation mechanism in catalytic C–H amination." Catalysis Science & Technology 10, no. 6 (2020): 1914–24. http://dx.doi.org/10.1039/c9cy02555c.

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A favorable S_N2-type N–Cl bond cleavage mechanism are proposed for Rh-catalysed C–H amination, which also works for N–O bond cleavage in Rh, Ru, and Pd analogous systems. These results could provide new understanding of C–H amination.

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Feng, Simin, Shan Li, Jing Li, and Junfa Wei. "Palladium-catalyzed annulation of N-alkoxy benzsulfonamides with arynes by C–H functionalization: access to dibenzosultams." Organic Chemistry Frontiers 6, no. 4 (2019): 517–22. http://dx.doi.org/10.1039/c8qo01311j.

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Tnay, Ya Lin, Gim Yean Ang, and Shunsuke Chiba. "Copper-catalyzed aerobic radical C–C bond cleavage of N–H ketimines." Beilstein Journal of Organic Chemistry 11 (October 19, 2015): 1933–43. http://dx.doi.org/10.3762/bjoc.11.209.

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We report herein studies on copper-catalyzed aerobic radical C–C bond cleavage of N–H ketimines. Treatment of N–H ketimines having an α-sp3 hybridized carbon under Cu-catalyzed aerobic reaction conditions resulted in a radical fragmentation with C–C bond cleavage to give the corresponding carbonitrile and carbon radical intermediate. This radical process has been applied for the construction of oxaspirocyclohexadienones as well as in the electrophilic cyanation of Grignard reagents with pivalonitrile as a CN source.

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Suzuki, Hiroharu, Akiko Inagaki, Kouki Matsubara, and Toshifumi Takemori. "Alkane activation on a multimetallic site." Pure and Applied Chemistry 73, no. 2 (January 1, 2001): 315–18. http://dx.doi.org/10.1351/pac200173020315.

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Trinuclear polyhydrido complex of ruthenium effectively activates alkanes to cleave C-H bonds in a selective manner due to cooperative action of the metal centers. The reaction of (Cp´Ru) 3 (m-H) 3 (m3 -H) 2 (1) (Cp´ = h5-C5Me5) with n-alkane at 170 °C leads to the formation of a trinuclear closo-ruthenacyclopentadiene complex as a result of a successive cleavage of six C-H bonds. Introduction of a m3-sulfido ligand into the Ru3 core of the trirutheniumpolyhydrido cluster significantly modifies the regioselectivity of the alkane C-H activation. Heating of a solution of (Cp´Ru) 3 (m3-S) (m-H) 3 (4) in alkane exclusively gives a trinuclear m3-alkylidyne complex via a selective C-H bond cleavage at the less-hindered terminus of alkane molecule.

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GuhaRoy, Chhandasi, Ray J. Butcher, and Samaresh Bhattacharya. "Rhodium complexes of 1,3-diaryltriazenes: Usual coordination, N–H bond activation and, N–N and C–N bond cleavage." Journal of Organometallic Chemistry 693, no. 26 (December 2008): 3923–31. http://dx.doi.org/10.1016/j.jorganchem.2008.10.006.

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Zhou, Xueer, Petra Vasko, Jamie Hicks, M. Ángeles Fuentes, Andreas Heilmann, Eugene L. Kolychev, and Simon Aldridge. "Cooperative N–H bond activation by amido-Ge(ii) cations." Dalton Transactions 49, no. 27 (2020): 9495–504. http://dx.doi.org/10.1039/d0dt01960g.

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Germylium-ylidene cations, [R(L)Ge]⁺, featuring amido substituents at R and NHC or phosphine donors at L have been synthesized and structurally characterized. The Lewis acidic germanium cation and proximal amide function allow for facile cleavage of N–H bonds in 1,2 fashion.

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Wang, Xiaoping, Tianbiao Liu, R. Morris Bullock, and Christina Hoffmann. "Heterolytic Cleavage of H2 Revealed by Neutron Single Crystal Diffraction." Acta Crystallographica Section A Foundations and Advances 70, a1 (August 5, 2014): C922. http://dx.doi.org/10.1107/s2053273314090779.

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Synthetic biologically inspired complexes exhibiting reactivity similar to hydrogenase enzymes have provided evidence of hydride transfer to the metal and proton transfer to an amine, but key structural information about the intermediate is not readily discernible with X-rays. The greater sensitivity of neutron to hydrogen makes it ideal for studying the structure and dynamics of catalytic materials. The newly commissioned TOPAZ neutron single crystal diffractometer at the SNS is capable of continuous 3D diffraction space mapping from a small stationary crystal, permitting detailed structural study at atomic resolution. The structure measured on TOPAZ for an Fe-based mononuclear electrocatalyst confirms that reaction of [CpFeN-L)](BARF) (1) with H2 under mild conditions leads to heterolytic cleavage of the H-H bond into a proton and hydride[1]. The precise location of H atoms in [Fe-H···H-N]+ reveals an unconventional H-bonding interaction, where the ferrous hydridic site {Fe(II)-H-} acts as the H-bond acceptor and the nitrogen of the protic pendant amine {L-N-H+} as the H-bond donor. The neutron structure provides clear evidence of a crucial intermediate involving an Fe-H···H-N interaction in the oxidation of H2. The result clarifies the key role of the pendant amine in the iron complex and provides insights into the design of synthetic electrocatalysts sought as cost-effective alternatives to platinum in fuel cells. The reaction is also a critical step in homogeneous catalysts for hydrogenation of C=O and C=N bonds. A preliminary result from TOPAZ measurement shows that 1 undergoes further single-crystal to single-crystal chemical reaction with moisture in the air, leading to a Fe(H2O)+ complex. Abbreviations: Cp = pentafluoropyridylcyclopentadienide; N-L= 1, 5-di(tert-butyl)-3,7-di(benzyl)-1,5-diaza-3,7-diphospha-cyclooctane; BARF = [B[3,5-(CF3)2C6H3]4]–

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KOELLIKER, R., and D. MILSTEIN. "ChemInform Abstract: Easy Cleavage of the N-H Bond of Ammonia." ChemInform 22, no. 33 (August 22, 2010): no. http://dx.doi.org/10.1002/chin.199133244.

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Dissertations / Theses on the topic "N–H bond cleavage"

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Chang, Yunghung. "Studies on PNP-Pincer Type Phosphaalkene Complexes of Iridium." 京都大学 (Kyoto University), 2014. http://hdl.handle.net/2433/189364.

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Hughes, Deborah. "N-N bond cleavage : an approach to slaframine." Thesis, University of Liverpool, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.277217.

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Baum, Marc Michael. "Cleavage of the N-N bond in high valent molybdenum hydrazido complexes." Thesis, Imperial College London, 1991. http://hdl.handle.net/10044/1/46668.

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Berg, Tieme Adriaan van den. "Iron catalyzed oxidation chemistry from C-H bond activation to DNA cleavage /." [S.l. : [Groningen : s.n.] ; University of Groningen] [Host], 2008. http://irs.ub.rug.nl/ppn/315029242.

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Locati, Abel Jean Serge. "Computational study of c-h bond cleavage and c-c bond formation processes catalyzed by transition metal complexes." Doctoral thesis, Universitat Rovira i Virgili, 2012. http://hdl.handle.net/10803/79120.

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La primera parte de la tesis se dedica al estudio del mecanismo de una reacción de activación C-H por un complejo de niobio. Se racionalizó el mecanismo de activación de enlaces C-H del benceno por el complejo TpMe2NbCH3(c-C3H5)(MeCCMe). El intermedio clave es un complejo inusual de 2-ciclopropeno. Conseguimos también racionalizar las selectividades obtenidas para la activación de varios alquilaromáticos por el complejo de niobio 2-ciclopropeno. También se investigó el papel del ligando alquino en estos complejos y su posible papel en procesos de migración de ligandos. En la segunda parte de la tesis, se investigaron las reacciones de acoplamiento cruzado con reactivos basados en silicio. Los resultados sugieren que la transmetalación es más fácil después de la disociación de la fosfina, o cuando un ligando bromuro está coordinado al paladio. El efecto beneficioso de la dibencilidenoacetona en el acoplamiento también fue aclarado.
The first part of the thesis is mainly devoted to the mechanism of a C-H activation reaction by a niobium complex. The mechanism of C-H bond activation of benzene by the TpMe2NbCH3-(c-C3H5)-(MeCCMe) complex was rationalized. The key intermediate is an unusual 2-cyclopropene complex. We rationalized the selectivities obtained for the activation of several alkylaromatics by the 2-cyclopropene niobium complex. The intriguing role of the alkyne ligand of the same complex, and its possible role in the migration processes, was investigated. In the second part of the thesis, we focused on the silicon based cross-coupling. The results suggest than the transmetalation is easier after phosphine dissociation, and in presence of the bromide ligand on the palladium. The beneficial effect of dibenzylideneacetone on the coupling was clarified.

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Laren, Martijn Wouter van. "Palladium-catalyzed C-H and C-N bond formation." [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2004. http://dare.uva.nl/document/75422.

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Shimbayashi, Takuya. "Studies on Transition Metal-Mediated Transformation of Oxime Esters Triggered by N-O Bond Cleavage Directed toward Synthesis of N-Heterocyclic Compounds." Kyoto University, 2018. http://hdl.handle.net/2433/232053.

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Pearson, Stephen. "High oxidation state carbene complexes for C-H bond activation catalysis." Thesis, University of Edinburgh, 2010. http://hdl.handle.net/1842/7570.

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Chapter one is an introduction to the less common coordination and oxidation chemistry of palladium; complexes containing Pd-OR, Pd-NR2 and those in the oxidation states of +IV. An outline of PdII/IV catalysed ligand-directed oxidative functionalisation is also included. Chapter two covers the design and synthesis of a range of tethered N-heterocyclic carbene (NHC) complexes of Pd. In addition, the syntheses of a number of new tethered NHC ligands are described. The use of Density Functional Theory (DFT) to model the complexes in this thesis was explored. Chapter three describes the synthesis and characterisation of PdIV halide complexes. The relevance of these compounds to PdII/IV catalysed ligand-directed oxidative functionalisation is explored. DFT was used to probe the reaction pathway for N-bromosuccinimide and iodobenzene dichloride. Chapter four examines reactions with oxidants used to form C-O and C-C bonds. The reaction pathway for iodobenzene diacetate was investigated using DFT. Chapter five contains experimental details and characterising data for the compounds reported.

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Cheng, Hanchao Verfasser], Carsten [Akademischer Betreuer] [Bolm, and Dieter [Akademischer Betreuer] Enders. "Copper-Catalyzed N−H Functionalizations of NH-Sulfoximines for C−N Bond Formation / Hanchao Cheng ; Carsten Bolm, Dieter Enders." Aachen : Universitätsbibliothek der RWTH Aachen, 2017. http://d-nb.info/1162499672/34.

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Cheng, Hanchao [Verfasser], Carsten [Akademischer Betreuer] Bolm, and Dieter [Akademischer Betreuer] Enders. "Copper-Catalyzed N−H Functionalizations of NH-Sulfoximines for C−N Bond Formation / Hanchao Cheng ; Carsten Bolm, Dieter Enders." Aachen : Universitätsbibliothek der RWTH Aachen, 2017. http://d-nb.info/1162499672/34.

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Books on the topic "N–H bond cleavage"

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Marx, David Earl. Studies in organometallic photochemistry: Bring-closure of M (CO)b5sL intermediates (M=Cr, Mo, W) and intermolecular C-H bond activation reactions with (np5s-Cb5sRb5s)M(CO)b2 s(M=Co, Rh, Ir; R=H, Chb3s). 1987.

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Book chapters on the topic "N–H bond cleavage"

1

Lane, J. D., C. J. Pickett, and D. R. Stanley. "From C-N or SI-N Bond Cleavage." In Inorganic Reactions and Methods, 100. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470145227.ch73.

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Miura, Masahiro, and Tetsuya Satoh. "Arylation Reactions via C-H Bond Cleavage." In Topics in Organometallic Chemistry, 55–83. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/b104129.

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Ackermann, Lutz. "Chelation-Assisted Arylation via C–H Bond Cleavage." In Topics in Organometallic Chemistry, 35–60. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/3418_2007_062.

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Liu, Zhanxiang, and Yuhong Zhang. "Catalytic C-H Bond Cleavage for Heterocyclic Compounds." In Green Techniques for Organic Synthesis and Medicinal Chemistry, 131–59. Chichester, UK: John Wiley & Sons, Ltd, 2018. http://dx.doi.org/10.1002/9781119288152.ch7.

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Appel, K. E., M. Bauszus, I. Roots, C. S. Rühl, and A. G. Hildebrandt. "Enzyme Catalysed Cleavage of the N-N Bond of N-Nitrosamines." In Biological Reactive Intermediates III, 959–70. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4684-5134-4_93.

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Brill, T. B. "By Cleavage of the C-H Bond by Mercuric Halides." In Inorganic Reactions and Methods, 165–66. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470145180.ch101.

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Ison, Elon A. "Toward NN Bond Cleavage: Synthesis and Reactivity of Group 7 Dinitrogen Complexes." In Transition Metal-Dinitrogen Complexes, 271–84. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2019. http://dx.doi.org/10.1002/9783527344260.ch5.

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Hirano, Koji, and Masahiro Miura. "Copper-Mediated Intermolecular C–H/C–H and C–H/N–H Couplings via Aromatic C–H Cleavage." In Topics in Organometallic Chemistry, 47–65. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/3418_2015_116.

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Reich, Hans J. "Mechanism of C-Si Bond Cleavage Using Lewis Bases (n → σ*)." In Lewis Base Catalysis in Organic Synthesis, 233–80. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2016. http://dx.doi.org/10.1002/9783527675142.ch8.

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Klopsch, Isabel, Ekaterina Yu Yuzik-Klimova, and Sven Schneider. "Functionalization of N2 by Mid to Late Transition Metals via N–N Bond Cleavage." In Nitrogen Fixation, 71–112. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/3418_2016_12.

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Conference papers on the topic "N–H bond cleavage"

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Couture, Axel, Pierre Grandclaudon, Éric Deniau, and Stéphane Lebrun. "Photochemically-Induced N-N Bond Cleavage of N,N-Disubstituted Hydrazides." In The 13th International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland: MDPI, 2009. http://dx.doi.org/10.3390/ecsoc-13-00167.

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Bolotov, Vasiliy Alexandrovich, Serguei Fedorovich Tikhov, Konstantin Radikovich Valeev, Vladimir Timurovich Shamirzaev, and Valentin Nikolaevich Parmon. "SELECTIVE FORMATION OF LINEAR ALPHA-OLEFINS VIA MICROWAVE CATALYTIC CRACKING OF LIQUID STRAIGHT-CHAIN ALKANES." In Ampere 2019. Valencia: Universitat Politècnica de València, 2019. http://dx.doi.org/10.4995/ampere2019.2019.9894.

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Linear even-carbon-number alpha-olefins (LAO) with four or more carbon atoms are important compounds of high demand in chemical industry as precursors of a wide range of value-added chemicals [1]. LAO are used as co-monomers for polyethylene production, for the production of alcohols (mainly in detergents and plasticizers) and for synthesis of polyalphaolefins (used in synthetic lubricants). Alpha-olefins (C4, C6, C8 and C10) are mainly used to produce poly(vinyl chloride) plasticizers, high-density and linear low-density polyethylene to impart the stress-crack resistance. C10–C14 alpha-olefins can be used to synthesize linear alkylbenzene sulfonates (synthetic detergents). A conventional route to produce alpha-olefins is oligomerization of ethylene. The process provides production of high quality alpha-olefins but is very costly. If not oligomerization, LAO can be produced by thermal cracking of waxy paraffins but the product is not pure and contains numerous internal olefins, dienes and paraffin impurities. The process is conducted in the vapor phase at relatively low cracking temperatures and needs rapid quenching to prevent side reactions such as isomerization or cyclization. In our previous work [2], we showed that the selectivity to alpha-olefins can be increased considerably via catalytic cracking of n-alkanes under selective MW heating of catalysts. In the present work, the general regularities of MW cracking of n-alkanes are presented. Porous ceramic matrix Al2O3/Al composites (ceramometals) and various carbon materials (CM) having high dielectric losses were studied as supports of the catalysts. MW cracking was conducted with n-C16H34 and n-C28H58. The influence particle size and surface morphology of ceramometals and CM on the structural and group composition of the products was studied. It was established that LAO (C2-C23) and n-alkanes (C2-C26) were the main cracking products under selective MW heating of the used supports. The quantitative analysis of the products demonstrated that the liquid-phase process is more selective to alpha-olefins at the MW catalytic cracking than at the convectional thermal cracking. Silica modification of the surface of CM was shown to suppress spark discharge (usually observed at MW heating of CM); hence, the thermal cleavage of C-C bonds on the CM surface but not in the plasma discharge contributes the most to the formation of radicals. It was shown that the selectivity to liquid alpha-olefin could be more than 85 % under MW heating of cermets in region of the E - field node and decrease considerably in the region of H - field node.

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Nyambo, Silver, Dong-Sheng Yang, and Yuchen Zhang. "PROBING SELECTIVE BOND ACTIVATION IN ALKYLAMINES: LANTHANUM-MEDIATED C-H AND N-H BOND ACTIVATION STUDIED BY MATI SPECTROSCOPY." In 73rd International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2018. http://dx.doi.org/10.15278/isms.2018.fb01.

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Ikeda, Kazuma, Makoto Inagaki, Nobuaki Kojima, Yoshio Ohshita, and Masafumi Yamaguchi. "Preferential N-H bond orientation in GaAsN grown by chemical beam epitaxy." In 2013 IEEE 39th Photovoltaic Specialists Conference (PVSC). IEEE, 2013. http://dx.doi.org/10.1109/pvsc.2013.6744886.

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Ikeda, K., K. Demizu, N. Kojima, Y. Ohshita, and M. Yamaguchi. "Preferential N-H Bond Direction in GaAsN(001) Grown by Chemical Beam Epitaxy." In 2013 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 2013. http://dx.doi.org/10.7567/ssdm.2013.ps-8-15.

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Mishra, Piyush, Timothy Zwier, Edwin Sibert, and Joshua Fischer. "PROPYLBENZENE-(H2O)n CLUSTERS: EFFECT OF THE ALKYL CHAIN ON THE π H-BOND." In 73rd International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2018. http://dx.doi.org/10.15278/isms.2018.te09.

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Obika, Satoshi, Masaharu Tomizu, Yoshinori Negoro, Ayako Orita, and Takeshi Imanishi. "Promotion of acid-mediated P-N bond cleavage of 5'-amino-2',4'-BNA oligonucleotides by triplex formation: Effects of neighboring residues." In XIVth Symposium on Chemistry of Nucleic Acid Components. Prague: Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 2008. http://dx.doi.org/10.1135/css200810423.

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Tykva, Richard, Jiřina Slaninová, Blanka Bennettová, Jan Hlaváček, Bohuslav Černý, Věra Vlasáková, and Václav Němec. "Metabolic cleavage of N- and C-terminal amino acids of an insect oostatic peptide H-Tyr-Asp-Pro-Ala-Pro-OH." In IXth Conference Biologically Active Peptides. Prague: Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 2005. http://dx.doi.org/10.1135/css200508100.

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Subramanian, Raghavendran, and Kazem Kazerounian. "Improved Molecular Model of a Peptide Unit for Proteins." In ASME 2006 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/detc2006-99315.

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Pauling, Corey and Branson in their seminal paper in 1951 reported numerical values for the bond lengths and bond angles for a peptide unit in proteins. These values became the standard model for several decades after that. This classic peptide model was either confirmed or improved upon by other researchers over the years, by using more advanced X-Ray diffraction equipments. In this paper, we have made an attempt to calibrate the values of these bond lengths and bond angles based on a systematic and deterministic approach applied to a collection of proteins defined structurally in the Protein Data Bank (PDB). Our method is based on the assumption that a peptide chain is a serial chain of identical rigid bodies connected by revolute joints (i.e. dihedral angles). The proposed procedure first computes the best estimate for the dihedral angles in the presence of inaccuracies in the atoms’ coordinates data. Then these values are used to find the conformation of the peptide chain using the calibrated model of the peptide unit. Through an optimization process, the structural error (RMSD of all atoms) between the resultant conformation and the PDB data is minimized to yield the best values for the bond length and bond angles in the calibrated peptide unit. Our numerical experiments indicate that by making small changes in the Pauling-Corey peptide model parameters (0.15% to 8.7%) the structural error is reduced significantly (3.0% to 57.4%). The optimum values for the bond angles and bond lengths are as follow: Bond Lengths: N-C(A): 1.4721Å, C(A)-C: 1.6167Å, C-N: 1.2047Å, C=O: 1.1913Å and N-H: 0.9621Å. Bond Bending Angles: N-C(A)-C: 109.6823°, C(A)-C=0: 119.518°, C(A)-C-N: 114.5553°, O=C-N: 125.9233°, C-N-H: 123.5155°, C-N-C(A): 121.5756°, C(A)-N-H: 114.901°. Peptide bond torsion angle: ω: 179.4432°.

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Tokunaga, F., T. Miyata, T. Nakamura, T. Morita, and S. Iwanaga. "LIPOPOLYSACCHARIDE-SENSITIVE SERINE-PROTEASE ZYMOGEN (FACTOR C) OF LIMULUS HEMOCYTES: IDENTIFICATION AND ALIGNMENT OF PROTEOLYTIC FRAGMENTS PRODUCED DURING THE ACTIVATION SHOW THAT IT IS A NOVEL TYPE OF SERINE-PROTEASE." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1644609.

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Limulus clotting factor, factor C, is a lipopolysaccharide (LPS)-sensitive serine-protease zymogen present in the hemocytes. It is a two-chain glycoprotein (M.W. = 123,000) composed of a heavy chain (M.W. = 80,000) and a light chain (M.W. = 43,000) T. Nakamura et al. (1986) Eur. J. Biochem. 154, 511-521 .On further studies of this zymogen, a single-chain factor C (M.W. = 123,000) was identified by Western blotting technique. The heavy chain had an NH2-terminal sequence of Ser-Gly-Val-Asp-, which was consistent with the NH2-terminal sequence of the single-chain factor C, indicating that the heavy chain is located in the NH2-terminal part of the zymogen. The light chain had an NH22-terminal sequence of Ser-Ser-Gln-Pro-. Incubation of the two-chain zymogen with LPS resulted in the cleavage of a Phe-Ile bond between residues 72 and 73 of the light chain. Concomitant with this cleavage, the A (72.amino acids) and B chains derived from the light chain was formed. The complete amino acid sequence of the A chain was determined by automated Edman degradation. The A chain contained a typical segment which is similar structuraly to those a family of repeats in human β2 -glycoprotein I, complement factors B, Clr, Cls, H, C4b-binding protein, 02, coagulation factor XIII b subunit, haptoglobin a chain, and interleukin 2 receptor. The NH2-terminal sequence of the B chain was Ile-Trp-Asn-Gly-. This chain contained the serine-active site sequence of -ASP-Ala-Cys-Ser-Gly-Asp-SER-Gly-Gly-Pro-.These results indicate that limulus factor C exists in the hemocytes in a single-chain zymogen form and is converted to an active serine-protease by hydrolysis of a specific Phe-Ile peptide bond. The correlation of limulus factor C and mammalian complement proteins was also suggested.

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Reports on the topic "N–H bond cleavage"

1

Klobukowski, Erik. Bulk gold catalyzed oxidation reactions of amines and isocyanides and iron porphyrin catalyzed N-H and O-H bond insertion/cyclization reactions of diamines and aminoalcohols. Office of Scientific and Technical Information (OSTI), January 2011. http://dx.doi.org/10.2172/1048517.

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