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umpolung (854) 854
chemistry, organic (500) 500
chemistry, multidisciplinary (380) 380
catalysis (276) 276
aldehydes (213) 213
organocatalysis (148) 148
index medicus (144) 144
carbenes (131) 131
gamma-butyrolactones (126) 126
n-heterocyclic carbenes (123) 123
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asymmetric-synthesis (113) 113
esters (110) 110
reactivity (109) 109
chemistry (107) 107
conjugate umpolung (107) 107
ketones (107) 107
stereoselective-synthesis (102) 102
enantioselective synthesis (85) 85
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n-heterocyclic carbene (80) 80
molecular structure (76) 76
reagents (76) 76
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generation (69) 69
nucleophilic carbenes (69) 69
imines (67) 67
organic-synthesis (67) 67
cyclization (63) 63
organic chemistry (63) 63
palladium (62) 62
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alkylation (55) 55
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oxidation (54) 54
direct annulations (52) 52
enals (52) 52
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article (51) 51
methane - analogs & derivatives (50) 50
methane - chemistry (50) 50
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alcohols (48) 48
cycloaddition (48) 48
activation (47) 47
chemical reactions (47) 47
analysis (45) 45
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chemical properties (43) 43
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chemistry, applied (40) 40
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amines (38) 38
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chemical synthesis (37) 37
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acylation (35) 35
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heterocyclic compounds - chemistry (34) 34
intramolecular stetter reaction (34) 34
one-pot synthesis (34) 34
umpolung addition (34) 34
anions (33) 33
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acids (30) 30
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Angewandte Chemie - International Edition, ISSN 1433-7851, 2007, Volume 46, Issue 5, pp. 754 - 757
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... 
thioketones | sulfur | alkynes | umpolung | thioketals
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
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 PdCl 2 and PPh 3 using ZnEt 2 as a stoichiometric transmetalation agent... 
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
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
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
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 | Equivalence | Catalysts | Formations | Catalysis | Carbenes
Journal Article
Chemistry – A European Journal, ISSN 0947-6539, 10/2018, Volume 24, Issue 57, pp. 15129 - 15129
An efficient method for the synthesis of polysubstituted pyrroles was established based on the [3+2] cycloaddition strategy utilizing the [1,2]‐phospha‐Brook... 
cycloaddition | [1,2]-phospha-Brook rearrangement | Brønsted base catalysis | umpolung | pyrrole
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, 09/2018, Volume 24, Issue 50, pp. 13059 - 13059
Reversal of electron flow during a tandem oxidative dearomatization–ring‐expanding rearomatization reaction was inspired by the East River in New York City, a... 
oxidative dearomatization | tandem reaction | medium ring | ring expansion | umpolung
Journal Article
Angewandte Chemie - International Edition, ISSN 1433-7851, 01/2012, Volume 51, Issue 2, pp. 314 - 325
Journal Article
Angewandte Chemie International Edition, ISSN 1433-7851, 07/2018, Volume 57, Issue 27, pp. 8332 - 8332
Breslow intermediates are the mechanistic heart of thiamine catalysis in vitamin B1‐dependent enzymes, such as pyruvate decarboxylase. In their Communication... 
Breslow intermediates | carbenes | reaction mechanisms | NMR spectroscopy | umpolung
Journal Article
Chemistry – A European Journal, ISSN 0947-6539, 03/2019, Volume 25, Issue 13, pp. 3382 - 3390
Journal Article
Angewandte Chemie International Edition, ISSN 1433-7851, 11/2013, Volume 52, Issue 48, pp. 12651 - 12654
Back to BACs : In the pursuit of novel carbene organocatalysts, bis(amino)cyclopropenylidenes (BACs) were explored as alternatives to N‐heterocyclic carbenes.... 
organocatalysis | carbenes | cyclopropenylidenes | Stetter reaction | umpolung | N-HETEROCYCLIC CARBENE | FUNCTIONAL CYCLO-C-3 DERIVATIVES | MICHAEL | INTERMOLECULAR STETTER REACTION | ALDOL-ALDOL REACTIONS | ALDEHYDES | CHEMISTRY, MULTIDISCIPLINARY | GAMMA-BUTYROLACTONES | CONJUGATE UMPOLUNG | SYSTEMS | ELECTRONIC STABILIZATION | Carbenes | Anions | Catalysis
Journal Article