Syntheses and catalysis of transition metal complexes with hemilabile ligands
Syntheses and catalysis of transition metal complexes with hemilabile ligands 1
... [P, O] ligands 19 ii 1. 4 .1. 1 Ni complexes 19 1. 4 .1. 2 Pd complexes 20 1. 4 .1. 3 Cr complexes 21 1.4 .1. 4 Rh complexes 22 1. 4.2 Reported complexes with ... 15 1. 3.2.4 Phosphine-imine ligands 17 1. 3.3 Bis(phosphine)amine ligands 18 1. 4 Complexes with mixed donor hybrid ligands of interest 19 1. 4 .1 Reported complexes with ... ligands 1. 3 .1. 1 Phosphine-ether ligands 1. 3 .1. 2 Phosphine-ester and phosphine-ketone ligands 11 1. 3 .1. 3 Phosphine-alcohol and phosphine-phenol ligands 12 1. 3 .1. 4 Phosphine-phosphonate...
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Syntheses and catalysis of transition metal complexes with hemilabile ligands
... enantioselective reduction of ketones to secondary alcohols They are nitrogenbased chelating ligands, diphosphines and heterobidentate [P, N] ligands 6.1.3.1 Nitrogen-based ligands A number of highly efficient ... The mixture of Pd2(dba)3, ligand and chloroform were made Preliminary analyses were performed on a one-pot reaction of Pd2(dba)3, ligand L1k in chloroform stirred at temperature of 60°C for h ... result of the hemilability of the ligands Table 5.1: Ligand effect on the Suzuki cross-coupling reactions of 1-bromo-2methylnaphthalene and 2-methylnaphthyl-1-boronic acid.a 1.2 mol% ligand 0.5mol%...
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Tài liệu Báo cáo khoa học: Structure of RNase Sa2 complexes with mononucleotides – new aspects of catalytic reaction and substrate recognition pptx
... for some of the differences observed in substrate recognition and RNA cleavage between RNases Sa2 and Sa 2¢-GMP in the active site of RNase Sa2 To obtain a set of complexes of RNase Sa2 with the ... understand the mechanism of RNA cleavage and differences in the catalytic properties of the two RNases, we have solved the structures of RNase Sa2 with a free active site, and in complexes with ... antiparallel b-strands (residues 7–9 , 5 4–5 9, 7 0–7 5, 8 0–8 3, and 9 1–9 4) (Fig 1) The antiparallel b-sheet, which contains three strands (residues 5 4–5 8, 7 1–7 4, and 7 9–8 3), forms the hydrophobic core of the...
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Development of transition metal catalyzed c s and c c cross coupling reactions
... of cross- coupling reactions of aryl halides in the processes of C C, C N and C S bond forming reactions In this dissertation, we have developed new cross- coupling protocols for the synthesis of ... Suzuki and Heck couplings) reactions under mild conditions Chapter 2: Decarboxylative C S Cross- Coupling CHAPTER Synthesis of Vinyl Sulfides by Copper -Catalyzed Decarboxylative C S Cross- Coupling ... Introduction 1.2 Transition metal- catalyzed cross- coupling reactions The use of transition- metals as catalysts has brought a dramatic revolution in synthetic organic chemistry Since the discovery of...
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Group 10 and group 11 transition metal chemistry of benzimidazolin 2 ylidene and indazolin 3 ylidene ligands
... Pd1-S2 2. 35 19(18), Pd2-S1 2. 35 02( 17), Pd2-S2 2. 36 73( 16); C1-Pd1-C 12 92. 4 (2) , C 23- Pd2-C34 94.1 (3) , C1-Pd1-S1 90. 42( 16), C 12- Pd1S2 93 .24 (18), C 23- Pd2-S1 88 .10( 6), C34-Pd2-S2 94. 03( 19), C1-Pd1-S2 174 .27 (17), ... Benzimidazolin- 2- ylidene Imidazolidin -2- ylidene Topology unsaturated, aromatic benzannulated, aromatic saturated, nonaromatic (C2) [ppm] 21 1- 22 1 22 3 - 23 2 23 8 -24 5 Angle N1-C2-N3 [] 101 .2( 2) -1 02 .2( 2) 1 03 .5(1) -104 .3( 1) ... = 29 c n = Br N Au Cl N n 31 a n = 31 b n = 31 c n = N Au Br N n 32 a n = 32 b n = 32 c n = N Au Br N Br n 33 a n = 33 b n = 33 c n = X List of tables List of Tables Table 3. 1 Selected bond lengths and...
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SYNTHESIS, STRUCTURE AND CATALYTIC APPLICATION OF NOVEL CARBENE COMPLEXES WITH BENZOTHIAZOLIN 2 YLIDENE LIGANDS 1
... PdCl ,11 4 -11 6 [Pd(allyl)Cl] , 12 5 - 12 6 PdCl (CH CN) , 83-84 ,11 7- 12 4 Pd(cod)CH Cl, 41, 118 -11 9, 12 7 - 12 8 PdCl (PhCN) ,95 ,11 9 Pd(cod)Cl , 41, 118 ,11 9, 12 8 -13 0 Pd(cod)Br , 41 Pd(cod)CH Br. 41 Ag(I)-NNHC complexes ... transition metal carbene complexes Complexes of Ni(II),78-79 Pd(II),80 Pt(II), 81 Au(I), 82- 91 Rh(I), 92- 10 1 Ir(I),96 ,10 0 ,1 02 Ru(II) ,10 3 -10 8 Ru(III) ,10 6 Cu(I), 85 ,10 8 -11 3 Cu(II) ,10 8 ,10 9 ,11 1 ,11 3 have been ... in NH,O- and NR,O-benzoxazolin -2- ylidene ligands1 71- 175 and Cr ,17 6 W ,17 6 -17 7 Re ,17 8 Fe ,17 9 Pd ,18 0 Pt180 and B1 81 complexes Scheme 1. 18 shows the synthesis of Pd(II) carbene complex 1. 76 by template...
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SYNTHESIS, STRUCTURE AND CATALYTIC APPLICATION OF NOVEL CARBENE COMPLEXES WITH BENZOTHIAZOLIN 2 YLIDENE LIGANDS 2
... 12. 63, 12. 60 1.53 15.10, 15.10 0.76 5.65, 5.05 - 12. 60, 12. 44 - 27 .3 27 .7 44.7 43.7 24 .5 24 .6 20 8.4 20 6.3 20 8.7 20 6.0 20 7.7 20 5.4 2. 3 02( 2) 2. 289(15) 2. 2 62( 8) 2. 267(8) 1.958(7) 1.971(6) 1.9 72( 3) ... 110.4(4) 111.4 (2) 111.4 (2) 130.7(5) 126 .3(4) 126 .9 (2) 128 .7 (2) 118.5(4) 123 .0(3) 122 .1(6) 123 .2( 5) 121 .61(15) 119.89(16) 122 .7 (2) 123 .8(3) 2. 5.3 Cleavage of 2. 2(a) and 2. 2(b) with tricyclohexylphosphine ... yields (2. 12( a) -2. 12( b)) (Scheme 2. 7) All the 80 Synthesis, Structure and Catalytic Application of Novel Carbene Complexes with Benzothiazolin- 2- ylidene Ligands Chapter two: Results and Discussion...
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SYNTHESIS, STRUCTURE AND CATALYTIC APPLICATION OF NOVEL CARBENE COMPLEXES WITH BENZOTHIAZOLIN 2 YLIDENE LIGANDS 3
... NMR ( 125 . 03 MHz, D2O): δ 135 .2 (im- 13 C2), 133 .3 (CH2CH2CH=CH2), 122 .4 (im C4/5), 118.8 (CH2CH2CH=CH2), 49 .3 (CH2CH2CH2CH3), 48.8 (CH2CH2CH=CH2), 33 .8 (CH2CH2CH=CH2), 31 .2 (CH2CH2CH2CH3), 18.7 ... CH2CH2CH=CH2), 4. 93- 4. 82 (m, 2H, CH2CH2CH=CH2), 3. 75 (t, 2H, 3JHH = 7.4 Hz, CH2CH2CH=CH2), 3. 35 (q, 2H, 3JHH = 6. 93 Hz, CH2CH2CH=CH2), 3 .21 (s, 3H, CH3), 2. 31 (s, 6H, CH3), 2. 13 (s, 12H, CH3) 20 8 ... NMR ( 125 . 03 MHz, D2O): δ 141.5 (im-C2), 136 .3, 135 .3 (Ar-C), 133 .1 (CH2CH2CH=CH2), 130 .8, 129 .2, 124 .1, 1 23 .0 (Ar-C), 119.4 (CH2CH2CH=CH2), 49.1 (CH2CH2CH=CH2), 33 .9 (CH2CH2CH=CH2), 20 .2 (CH3),...
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SYNTHESIS, STRUCTURE AND CATALYTIC APPLICATION OF NOVEL CARBENE COMPLEXES WITH BENZOTHIAZOLIN 2 YLIDENE LIGANDS 4
... obtained from bridge cleavage of dinuclear NSHC complexes of type [PdBr2(NSHC) ]2 (2. 2(a )2. 2(b) and 2. 17) complexes with different nucleophilic ligands Complexes 2. 9 -2. 16 are active in the Suzuki–Miyaura ... II, Sections 2. 4 -2. 8 discusses the synthesis and characterization of a range of mixed-NSHC-L Pd(II) complexes (L = phosphine, aromatic N-heterocycles, pyridyl and azole ligands (2. 9 -2. 27)) They ... Chapter Four Conclusion and Summary coupling of aryl bromides and activated aryl chlorides and give good conversions of diaryl products Complexes 2. 1 -2. 4, cis -2. 5, 2. 6 -2. 7 are structurally characterized...
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Synthesis and molecular assemblies of d10 metal complexes bearing 9, 10 disubstituted anthracene ligand
... in both solid state and frozen solution vii Part I Synthesis and Molecular Assemblies of d10 Metal Complexes Bearing 9, 10- Disubstituted Anthracene Ligand Chapter Roles of Anthracene Unit in Inorganic ... Summary…………………………………………………………………………………vi Part I Synthesis and Molecular Assemblies of d10 Metal Complexes Bearing 9, 10- Disubstituted Anthracene Ligand Chapter Roles of Anthracene Unit in Inorganic Chemistry ... Structure of 9, 10- anthracenedithiol (H2SAnS) Chapter Molecular Assemblies of AuI Complexes with 9, 10Bis(diphenylphosphino )anthracene Ligand 10 2.1 Introduction Gold(I) phosphine complexes have...
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Tài liệu Socio-demographic characteristics and sexual health related attitudes and practices of men having sex with men in central and southern Malawi doc
... research and programmatic interest in efforts aimed to prevent the spread of HIV in Malawi Materials and Methods Study area The study was conducted in the central and southern regions of Malawi and included ... giving verbal informed consent Only men who were having sex with other men were involved in questionnaire distribution and collection The involvement of MSM as research assistants possibly minimised ... situation of MSM in Malawi is problematic It is illegal for men to have sex with other men In an environment where HIV infection prevalence in adults is 12% and with the “bridging” or mixing between...
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Tài liệu Báo cáo khoa học: The role in the substrate specificity and catalysis of residues forming the substrate aglycone-binding site of a b-glycosidase docx
... Furthermore, these data may be of particular importance in understanding the physiological role of b-glycosidases and in designing inhibitors In addition, another important issue in understanding the aglycone ... details about the role of different residues of the aglycone-binding site in the stabilization of ESà and the interdependence between the binding of aglycone and the positioning of glycone in ... planned taking into account the residues found in the b-glycosidase from A B C D E Fig Comparison of the aglycone-binding site of some b-glycosidases (A) Aglycone-binding site of ZmGlu1 The aglycone...
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Tài liệu An Account of the Foxglove and some of its Medical Uses With Practical Remarks on Dropsy and Other Diseases doc
... considered as cases lost to An Account of the Foxglove and some of its by William Withering the common run of practice, and only snatched from destruction, by the efficacy of the Digitalis; and ... I find the following memorandum "February 20th, 1779, gave an account of Doctor Withering's An Account of the Foxglove and some of its by William Withering practice, with the precautions necessary ... damn the reputation of any very active and powerful medicine? And is it not more than probable that the neglect of adhereing to a certain and regular preparation of the nicotiana, and the want (of...
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Báo cáo khoa học: High resolution structure and catalysis of O-acetylserine sulfhydrylase isozyme B from Escherichia coli pot
... FEBS 5383 Structure < /b> of < /b> the O-acetylserine < /b> sulfhydrylase < /b> CysM G Zocher et al Fig Stereo ribbon plot of < /b> the high < /b> resolution < /b> structure < /b> of < /b> the CysM dimer, including the molecular twofold axis (black), ... Five structures of < /b> CysK-type enzymes from bacteria [10–14], archaea [15] and < /b> plants [16,17], and < /b> two structures of < /b> bacterial CysM [6,18], have been published The differences between the isozymes ... The mobility distributions of < /b> CysM(K268A), wildtype CysM and < /b> CysM(salmo), and < /b> those of < /b> subunits B and < /b> D of < /b> CysM(RKE), resemble each other closely (Fig 5) However, a most surprising deviation of...
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Báo cáo khoa học: Production and utilization of hydrogen peroxide associated with melanogenesis and tyrosinase-mediated oxidations of DOPA and dopamine docx
... performed with HPLC-ED to determine if, and to what extent, H2O2 was generated during the autoxidations and tyrosinase-mediated oxidations of tyrosine, DOPA, and dopamine This sensitive and specific ... Representative chromatograms of the autoxidation and tyrosinase-mediated oxidations of DOPA, with and without catalase Peak profiles represent levels of DOPA in lL samples of separate reaction mixtures ... monitor in real-time the production of H2O2 during the autoxidations and tyrosinase-mediated oxidations of DOPA and dopamine A pulse voltage (+400 mV) maintained on a sensitive and selective H2O2 sensor...
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