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umpolung (938) 938
chemistry, organic (505) 505
chemistry, multidisciplinary (395) 395
catalysis (276) 276
aldehydes (222) 222
index medicus (154) 154
organocatalysis (150) 150
carbenes (128) 128
n-heterocyclic carbenes (126) 126
gamma-butyrolactones (125) 125
asymmetric-synthesis (121) 121
alpha,beta-unsaturated aldehydes (120) 120
derivatives (114) 114
esters (114) 114
ketones (112) 112
chemistry (111) 111
reactivity (111) 111
conjugate umpolung (110) 110
stereoselective-synthesis (107) 107
enantioselective synthesis (91) 91
stereoisomerism (82) 82
n-heterocyclic carbene (81) 81
reagents (79) 79
molecular structure (73) 73
synthesis (73) 73
generation (72) 72
organic chemistry (69) 69
imines (68) 68
catalysts (67) 67
nucleophilic carbenes (67) 67
organic-synthesis (64) 64
palladium (64) 64
stetter reaction (63) 63
mechanism (62) 62
cyclization (61) 61
efficient synthesis (61) 61
asymmetric catalysis (60) 60
diels-alder reactions (57) 57
alkylation (56) 56
enals (55) 55
oxidation (54) 54
direct annulations (53) 53
chemical reactions (52) 52
heterocycles (52) 52
alcohols (50) 50
allylation (50) 50
article (50) 50
methane - analogs & derivatives (49) 49
methane - chemistry (49) 49
activation (47) 47
carbonyl-compounds (47) 47
asymmetric synthesis (46) 46
complexes (46) 46
cycloaddition (46) 46
enantiomers (45) 45
letter (43) 43
analysis (42) 42
carbon (42) 42
chemical properties (42) 42
construction (42) 42
nucleophiles (42) 42
benzoin condensation (41) 41
conjugate addition (41) 41
michael addition (41) 41
chemical synthesis (40) 40
chemistry, applied (40) 40
carben (39) 39
aldehydes - chemistry (38) 38
amines (38) 38
cooperative catalysis (37) 37
one-pot synthesis (37) 37
acylation (36) 36
nucleophilic acylation (36) 36
synthetic methods (36) 36
chemistry, physical (35) 35
katalyse (34) 34
umpolung addition (34) 34
acids (33) 33
anions (33) 33
stereoselectivity (33) 33
heterocyclic compounds (32) 32
heterocyclic compounds - chemistry (32) 32
intramolecular stetter reaction (32) 32
natural products (31) 31
homoenolate (30) 30
regioselectivity (30) 30
alkenes (29) 29
n‐heterocyclic carbenes (29) 29
acid (28) 28
anion (28) 28
arylation (28) 28
ligands (28) 28
rearrangement (28) 28
umpolung reactions (28) 28
activated double-bonds (27) 27
aldehyd (27) 27
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amination (27) 27
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Angewandte Chemie - International Edition, ISSN 1433-7851, 2007, Volume 46, Issue 5, pp. 754 - 757
Journal Article
Angewandte Chemie International Edition, ISSN 1433-7851, 09/2010, Volume 49, Issue 39, pp. 7120 - 7124
Surprises from a classic: The Breslow intermediate of triazolylidene‐catalyzed benzoin condensations was characterized for the first time by NMR spectroscopy... 
organocatalysis | carbenes | reaction mechanisms | NMR spectroscopy | umpolung | Umpolung | Reaction mechanisms | Carbenes | Organocatalysis | STRATEGY | CONJUGATE UMPOLUNG | BENZOIN | ADDITIONS | CHEMISTRY, MULTIDISCIPLINARY | ACYLSILANES
Journal Article
Chemistry – A European Journal, ISSN 0947-6539, 10/2017, Volume 23, Issue 57, pp. 14099 - 14099
N‐alkenoxypyridinium salts, generated from the corresponding activated alkynes using a gold(I) catalyst, showed unconventional umpolung activity. This umpolung... 
thioketones | sulfur | alkynes | umpolung | thioketals
Journal Article
Angewandte Chemie International Edition, ISSN 1433-7851, 08/2011, Volume 50, Issue 36, pp. 8412 - 8415
leahciM! The N‐heterocyclic carbene catalyzed umpolung of Michael acceptors proceeds through the formation of a deoxy‐Breslow intermediate (see scheme;... 
organocatalysis | carbenes | Michael acceptors | nitrogen heterocycles | umpolung | STABLE CARBENE | 1,3,4-TRIPHENYL-4,5-DIHYDRO-1H-1,2,4-TRIAZOL-5-YLIDENE | NHC | DIMERIZATION | ALDEHYDES | CHEMISTRY, MULTIDISCIPLINARY | GAMMA-BUTYROLACTONES | ENALS | CONJUGATE UMPOLUNG | DIRECT ANNULATIONS | HYDROACYLATION
Journal Article
Advanced Synthesis and Catalysis, ISSN 1615-4150, 08/2004, Volume 346, Issue 9-10, pp. 1035 - 1050
Journal Article
Angewandte Chemie International Edition, ISSN 1433-7851, 03/2017, Volume 56, Issue 10, pp. 2730 - 2734
N‐Heterocyclic carbene (NHC) catalysis has been widely used for the umpolung of aldehydes, and recently for the umpolung of Michael acceptors. Described herein... 
organocatalysis | imines | indoles | umpolung | N-heterocyclic carbenes | NHC CATALYSIS | TO-TAIL DIMERIZATION | MECHANISM | BOND-FORMING REACTIONS | REACTIVITY | ASYMMETRIC UMPOLUNG | ALDEHYDES | CHEMISTRY, MULTIDISCIPLINARY | ORGANOCATALYSTS | STETTER REACTION | HYDROACYLATION | Schiff bases | Heterocyclic compounds | Catalysis | Transformation | Salts | Biological effects | Imines | Aromatic compounds | Indole | Aldehydes | Intermediates
Journal Article
Angewandte Chemie International Edition, ISSN 1433-7851, 12/2019, Volume 58, Issue 50, pp. 18069 - 18074
Dearomatization of indoles provides efficient synthetic routes for substituted indolines. In most cases, indoles serve as nucleophiles. Reported here is an... 
indoles | asymmetric synthesis | photochemistry | dearomatization | umpolung
Journal Article
Angewandte Chemie International Edition, ISSN 1433-7851, 12/2019, Volume 58, Issue 49, pp. 17856 - 17862
Nucleophile–nucleophile coupling is a challenging transformation in organic chemistry. Herein we present a novel umpolung strategy for α‐functionalization of... 
organocatalysis | bioconjugation | oxidative thiolation | enantioselective α-thiolation | umpolung
Journal Article
Journal of the American Chemical Society, ISSN 0002-7863, 10/2009, Volume 131, Issue 40, pp. 14176 - 14177
Catalytic generation of α,β-unsaturated acyl imidazolium cations and enolates has been achieved, and their involvement in a Michael addition acylation sequence... 
HOMOENOLATE | ALCOHOLS | DIELS-ALDER REACTIONS | ACYLATION | ESTERS | ALDEHYDES | UMPOLUNG | CHEMISTRY, MULTIDISCIPLINARY | DIRECT ANNULATIONS | ENALS
Journal Article
Angewandte Chemie International Edition, ISSN 1433-7851, 01/2007, Volume 46, Issue 5, pp. 754 - 757
Inexpensive, recyclable, and activable: these are the features of a new mild electrophilic trifluoromethylation reagent that can be used to transfer a CF3... 
iodine | trifluoromethylation | hypervalent compounds | electrophilic substitution | umpolung | AGENTS | PERFLUOROALKYLATION | DERIVATIVES | CHEMISTRY, MULTIDISCIPLINARY | AMINO-ACIDS | DISULFIDES
Journal Article
Synthesis, ISSN 0039-7881, 01/2017, Volume 49, Issue 2, pp. 403 - 408
Abstract In this study, two synthetic methods for the synthesis of a hitherto unknown class of heterocyclic diastereo- and enantiopure S , O -acetals are... 
paper | carbenoids | sulfonimidates | sulfoximines | oxathiazines | umpolung
Journal Article
Chemistry – A European Journal, ISSN 0947-6539, 11/2015, Volume 21, Issue 46, pp. 16391 - 16394
Various allylic alcohols were carboxylated in the presence of a catalytic amount of PdCl2 and PPh3 using ZnEt2 as a stoichiometric transmetalation agent under... 
carboxylation | carbon dioxide | allylic compounds | carboxylic acids | umpolung | TRANSFORMATION | PI-ALLYLPALLADIUM | REAGENTS | ONE-POT SYNTHESIS | COMPLEXES | ALPHA-AMINO-ACIDS | ALIPHATIC-ALDEHYDES | CHEMISTRY, MULTIDISCIPLINARY | DIETHYLZINC-MEDIATED UMPOLUNG | CARBON-DIOXIDE | ASYMMETRIC ALLYLATION | Automated teller machines | Palladium | Acrylic acid | Organic acids | Lactones
Journal Article
Angewandte Chemie International Edition, ISSN 1433-7851, 01/2019, Volume 58, Issue 4, pp. 919 - 919
A bioinspired radical Stetter reaction of α‐keto acids and aldehydes has been designed that is contingent on a formal “radical umpolung” concept. In their... 
radicals | ion pairs | Stetter reaction | electrostatic interactions | umpolung
Journal Article
Angewandte Chemie International Edition, ISSN 1433-7851, 05/2018, Volume 57, Issue 20, pp. 5888 - 5892
Journal Article
Chemistry – A European Journal, ISSN 0947-6539, 03/2019, Volume 25, Issue 13, pp. 3382 - 3390
Journal Article
Chemical Society Reviews, ISSN 0306-0012, 5/2013, Volume 42, Issue 12, pp. 496 - 4917
Reaction discovery using N -heterocyclic carbene organocatalysis has been dominated by the chemistry of acyl anion equivalents. Recent studies demonstrate that... 
ALCOHOLS | HIGHLY ENANTIOSELECTIVE SYNTHESIS | KETENES | 4+2 CYCLOADDITION | TRANSESTERIFICATION REACTIONS | ESTERS | CATALYTIC-ACTIVITY | 1ST EXAMPLE | UMPOLUNG | CHEMISTRY, MULTIDISCIPLINARY | MICHAEL ADDITION | Carbonyl compounds | Anions |