bluuebunny/crossref_metadata_2025_split huggingface dataset:
Sterically Crowded Ethanes and Ethenes from Tri‐tert‐butylsilylmethyl Carbenoids
Authors: Weidenbruch Manfred , Flott Hermann 
Published: December 2003

AbstractThe complete manuscript of this communication appears in: Angew. Chem. Suppl. 1982, 973. DOI:10.1002/anie.198209730
Diastereoselective Homoaldol Reaction with a (1‐Oxycrotyl)aluminum Compound, a Homoenolate Equivalent of n‐Butanal
Authors: Hoppe Dieter , Lichtenberg Florian 
Published: December 2003

AbstractThe complete manuscript of this communication appears in: Angew. Chem. Suppl. 1982, 961. DOI:10.1002/anie.198209610
Stereospecific Synthesis of Palladium(II) Complexes of Macrocyclic Tetradentate Phosphane Ligands
Authors: Bartsch Rainer , Hietkamp Sibbele , Morton Stephen , Stelzer Othmar 
Published: December 2003

AbstractThe complete manuscript of this communication appears in: Angew. Chem. Suppl. 1982, 807. DOI:10.1002/anie.198208070
New Possible Applications of Heavy Main‐Group Elements in Organic Synthesis
Authors: Kauffmann Thomas 
Published: December 2003

AbstractAside from elements of the 2nd row, and one element of the 3rd row of the periodic system—Si, P, S, and Se, respectively, whose organoelement groups such as Me3Si and Ph3P⊕have proven useful in numerous organic syntheses—other elements of the 3rd as well as 4th and 5th row (Ge, As, Sn, Sb, Te, Pb, Bi) can also be used as components of synthetically useful organoelement groups, the elements As, Sn, and Pb, in particular, offering certain advntages over the others. Some of these organoelement groups are suitable equivalents for Li‐ or halogen‐substituents attached to carbon; they stabilize carbanionic centers (minimum of this effect at the 3rd‐row elements), and owing to their suitability as leaving groups in β‐eliminations, also open up interesting synthetic possibilities. The thermally unducedsyn‐ and silica‐gel inducedanti‐elimination of Ph3Sn, Ph2Sb, Ph3Pb, together with β‐OH, are novel. With the newly synthesized compounds PhnEl—Ch2—Li (El = Sn, Pb, As, Sb, Bi) and other α‐ and β‐lithiated RnEl‐ and Ph2As(O)‐reagents such organoelement groups can be introduced into organic compounds and exploited in organic and organoelement synthesis.
Carbonyliron‐Assisted Cycloaddition of a 1,3‐Diene to a CC Double Bond: Synthesis of an Anthracyclinone Precursor
Authors: Vioget Philippe , Vogel Pierre , Roulet Raymond 
Published: December 2003

AbstractThe complete manuscript of this communication appears in: Angew. Chem. Suppl. 1982, 1128. DOI:10.1002/anie.198211280
Synthesis and Properties of [2,3‐Bis(trimethylsilyl)‐2‐cyclopropen‐1‐yl]‐diazomethane
Authors: Maier Günther , Hoppe Manfred , Reisenauer Hans Peter , Krüger Carl 
Published: December 2003

AbstractThe complete manuscript of this communication appears in: Angew. Chem. Suppl. 1982, 1061. DOI:10.1002/anie.198210610
Radical Ion‐Pairs as Intermediates in Reactions of Tetra‐tert‐butyltetrahedrane and Tetra‐tert‐butylcyclobutadiene
Authors: Maier Günther , Schneider Klaus‐Albert , Malsch Klaus‐Dieter , Irngartinger Hermann , Lenz Andrea 
Published: December 2003

AbstractThe complete manuscript of this communication appears in: Angew. Chem. Suppl. 1982, 1072. DOI:10.1002/anie.198210720
1‐Phenylazulene → 2‐Phenylazulene Rearrangement—Substituent Migration or Skeletal Rearrangement?
Authors: Zeller Klaus‐Peter 
Published: December 2003

AbstractThe complete manuscript of this communication appears in: Angew. Chem. Suppl. 1982, 1016. DOI:10.1002/anie.198210160
Trialkylsily(trifluoromethyl)diazenes as Tailored Reagents for Nucleophilic Trifluoromethylation
Authors: Hartkopf Uwe , de Meijere Armin 
Published: December 2003

AbstractThe complete manuscript of this communication appears in: Angew. Chem. Suppl. 1982, 1121. DOI:10.1002/anie.198211210
The Chemical Behavior of Multibridged [2n] Cyclophanes
Authors: Kleinschroth Jürgen , Hopf Henning 
Published: December 2003

AbstractMultibridged [2n] cyclophanes comprise a novel class of aromatic compounds, in which two benzene rings are connected by three up to a maximum of six ethano bridges. Compared to classical nonannelated arenes, their most distinct chemical property is the ease with which, particularly the higher‐bridged homologs, take part in addition reactions (Diels‐Alder additions, hydrogenations, and ionic additions). On the other hand, the typical regenerative behavior of aromatic molecules is not fully suppressed in the [2n]cyclophanes as evidenced by such typical electrophilic aromatic substitution reactions as bromination, Friedel‐Crafts acylation, and nitration. Besides these reactions in which the benzene rings are either destroyed or retained, reactions at and with the ethano bridges, e.g. their cleavage, isomerization, and functionalization can also occur.
(Oxamidoximato)(oxamidoxime)platinium(II) 7,7,8,8‐Tetracyanoquinodimethanide: A Crystal Structure with Segregated Parallel Stacks
Authors: Endres Helmut 
Published: December 2003

AbstractThe complete manuscript of this communication appears in: Angew. Chem. Suppl. 1982, 1309. DOI:10.1002/anie.198213090
Constitution of the Deferriform of the Albomycins δ1, δ2 and ε
Authors: Benz Günter , Schröder Theo , Kurz Jürgen , Wünsche Christian , Karl Wolfgang , Steffens Gerd , Pfitzner Jörg , Schmidt Delf 
Published: December 2003

AbstractThe complete manuscript of this communication appears in: Angew. Chem. Suppl. 1982, 1322. DOI:10.1002/anie.198213220
3‐Hydroxy‐2‐(1,2,4‐triazol‐1‐yl)acrylic Acid Ethyl Ester and O‐Functional Derivatives
Authors: Maier Thomas , Cavagna Friedrich 
Published: December 2003

AbstractThe complete manuscript of this communication appears in: Angew. Chem. Suppl. 1982, 1246. DOI:10.1002/anie.198212460
o‐ and m‐Phenylenebis(dischlorophosphane)—Versatile, Useful Synthetic Building Blocks
Authors: Drewelies Kurt , Latscha Hans Peter 
Published: December 2003

AbstractThe complete manuscript of this communication appears in: Angew. Chem. Suppl. 1982, 1416. DOI:10.1002/anie.198214160
Prostacyclin and Synthetic Analogues
Authors: Bartmann Wilhelm , Beck Gerhard 
Published: December 2003

AbstractThe prostanoids continue to attract a great deal of attention, particularly in the pharmacological sector. Many of the numerous biological studies on prostaglandins deal with their cardiovascular effects. The pronounced antihypertensive and platelet aggregation‐inhibiting properties of prostacyclin (PGI2) resulted in world‐wide efforts to synthesize acid‐stable analogues of the natural product. Whereas refined analytical procedures disproved the hypothesis that PGI2 is a circulating hormone, exploratory human trials with PGI2 confirmed the pharmacological findings obtained from animal experiments. Clinical studies of PGI2 analogues have been started. In vitro studies on isolated vessels revealed that potent cardiovascular drugs stimulate prostacyclin synthesis; however, it has not as yet been possible to demonstrate whether these effects are also of therapeutic significance. A survey of the PGI2 analogues synthesized so far is presented, and, with the aid of a few examples, the problems encountered during their synthesis are outlined; structure‐activity relationships are also discussed.
Reversible O2‐Addition to Polymeric Schiff‐Base Complexes of VII and MnII and Their Use as Oxidation Catalysts
Authors: Sawodny Wolfgang , Grünes Reinhard , Reitzle Helmut 
Published: December 2003

AbstractThe complete manuscript of this communication appears in: Angew. Chem. Suppl. 1982, 1662. DOI:10.1002/anie.198216620For corrigendum see DOI:10.1002/anie.198302581
Oxidative Cleavage of Benzyl Esters with Triarylamine Cation Radicals—Selective Deblocking of Protected Carboxy Functions
Authors: Dapperheld Steffen , Steckhan Eberhard 
Published: December 2003

AbstractThe complete manuscript of this communication appears in: Angew. Chem. Suppl. 1982, 1730. DOI:10.1002/anie.198217300
Tricarbonyl‐2,7‐methanoaza[10]annulenechromium(0)
Authors: Hilken Günter , Kinkel Tonio , Schwamborn Michael , Lex Johann , Schmickler Hans , Vogel Emanuel 
Published: December 2003

AbstractThe complete manuscript of this communication appears in: Angew. Chem. Suppl. 1982, 1622. DOI:10.1002/anie.198216220
Chiral Binuclear Carbene Complexes from (R,R)‐1‐(1‐Dimethylaminoethyl)‐2‐lithioferrocene and Hexacarbonyltungsten
Authors: Herrmann Rudolf , Ugi Ivar 
Published: December 2003

AbstractThe complete manuscript of this communication appears in: Angew. Chem. Suppl. 1982, 1630. DOI:10.1002/anie.198216300
Novel Synthetic Building Blocks Activated by Ring Strain: General Entry to 2‐Chloro‐2‐cyclopropylidene Acetates
Authors: Liese Thomas , Splettstösser Gisela , de Meijere Armin 
Published: December 2003

AbstractThe complete manuscript of this communication appears in: Angew. Chem. Suppl. 1982, 1715. DOI:10.1002/anie.198217150
Reactivity by Ring Strain: Spirocyclopropyl‐Annelated Tricyclic Skeletons by a One‐Pot Three‐Step Reaction
Authors: Spitzner Dietrich , Engler Anita , Liese Thomas , Splettstösser Gisela , de Meijere Armin 
Published: December 2003

AbstractThe complete manuscript of this communication appears in: Angew. Chem. Suppl. 1982, 1722. DOI:10.1002/anie.198217220
New Dihydropyrans: Lewis Acid Catalyzed Cycloadditions of α,β‐Unsaturated Acyl Cyanides to Simple, Unactivated Olefins and Dienes: A Readily Accessible Route to Derivatives of Rose Oxide
Authors: Ismail Zeinhom M. , Hoffmann H. M. R. 
Published: December 2003

AbstractThe complete manuscript of this communication appears in: Angew. Chem. Suppl. 1982, 1819. DOI:10.1002/anie.198218190
[Fe3W3S14]4−, A Novel Hexanuclear, “Pure” Bimetal‐Sulfur Cluster with Fe3(μ3‐S)2 Center
Authors: Müller Achim , Hellmann Winfried , Bögge Hartmut , Jostes Rainer , Römer Michael , Schimanski Uwe 
Published: December 2003

AbstractThe complete manuscript of this communication appears in: Angew. Chem. Suppl. 1982, 1757. DOI:10.1002/anie.198217570
Synthesis of Pd(η2‐CH2C5Me4)L2: Formation of a Fulvene Ligand by Metal‐Assisted H‐Shift from Pentamethylcyclopentadienyl
Authors: Kraus Hans‐Jürgen , Werner Helmut 
Published: December 2003

AbstractThe complete manuscript of this communication appears in: Angew. Chem. Suppl. 1982, 1793. DOI:10.1002/anie.198217930
The Sulfonation of Aromatic Isocyanates: Sulfonated p‐Tolyl Isocyanate—An X‐Ray Structure Analysis
Authors: Ballé Gerhard , Born Liborius , Dieterich Dieter , Petinaux Marcel , Reiff Helmut 
Published: December 2003

AbstractThe complete manuscript of this communication appears in: Angew. Chem. Suppl. 1982, 1875. DOI:10.1002/anie.198218750
Norcaradiene Valence Tautomer of a 1,6‐Methanol[10]annulene: Tricyclo[4.4.1.01,6]undeca‐2,4,7,9‐tetraene‐11,11‐dicarbonitrile
Authors: Vogel Emanuel , Scholl Thomas , Lex Johann , Hohlneicher Georg 
Published: December 2003

AbstractThe complete manuscript of this communication appears in: Angew. Chem. Suppl. 1982, 1882. DOI:10.1002/anie.198218820
A Novel Route to Phloroglucinols ‐ Synthesis, Structure, and Reactions of [n](2,4)Phloroglucinophanes
Authors: Effenberger Franz , Schönwälder Karl‐Heinz , Stezowski John J. 
Published: December 2003

AbstractThe complete manuscript of this communication appears in: Angew. Chem. Suppl. 1982, 1833. DOI:10.1002/anie.198218330
Cyclobutadienes or Acetylenes from (2‐Cyclopropen‐1‐yl)carbenes—A Question of Spin Multiplicity?
Authors: Eisenbarth Philipp , Regitz Manfred 
Published: December 2003

AbstractThe complete manuscript of this communication appears in:Angew. Chem. Suppl. 1982, 2016. DOI:10.1002/anie.198220160
A μ2‐η2‐Styryl Complex by Reaction of Cp2Mo2(CO)4 with the Wittig Reagent (C6H5)3PCH2
Authors: Endrich Klaus , Korswagen Richard , Zahn Thomas , Ziegler Manfred L. 
Published: December 2003

AbstractThe complete manuscript of this communication appears in: Angew. Chem. Suppl. 1982, 1906. DOI:10.1002/anie.198219060
Organometallic Compounds of Titanium and Zirconium as Selective Nucleophilic Reagents in Organic Synthesis
Authors: Weidmann Beat , Seebach Dieter 
Published: December 2003

AbstractThe addition of carbanionic organometallic compounds (usually RLi or RMgX) to a carbonyl group—a key step in numerous syntheses—is not always straightforward. Depending on the substrate, various complications and problems may arise, but in many cases these can be remedied by addition of (RO)3TiCl, (RO)3ZrCl or (R2N)3TiX to the classic lithium and Grignard reagents. This usually leads to formation of stable organo‐titanium and ‐zirconium compounds which react highly selectively with carbonyl groups. For example, CH3Ti(OiPr)3 reacts five orders of magnitude faster with benzaldehyde than with acetophenone at room temperature; reagents of the type RTi(OiPr)3 add smoothly to nitro‐, ido‐, or cyano‐subsituted benzaldehyde, and the reactions may be performed in chlorinated solvents or acetonitrile; the zirconium analogues have particularly low basicity and add in high yield to α‐ and β‐tetralones or to substrates containing a nitroaldol group; the inclusion of chiral OR* groups gives enantioselective reagents (up to 90% ee); allylic (RO3)Ti‐ derivatives react only at the more highly substituted carbon atom and, in addition, react diastereoselectively (up to 98% ds) with unsymmetrical ketones. Finally, titanium reagents have also been found to effect novel transformations such as direct geminal dialkylation (CO→CMe2) and alkylative amination [CO→CR(NR)]. The modification and finetuning (“taming”) of carbonyl reactivity obtainable by use of the new reagents is not dearly bought; starting materials are the cheap and harmless “titanates”, “zirconates” and the corresponding tetrachlorides.
Novel One‐Step Synthesis of Oxocyclopentanecarboxylates by Electrochemical Reduction of Cinnamic Acid Esters
Authors: Nishiguchi Ikuzo , Hirashima Tsuneaki 
Published: December 2003

AbstractThe complete manuscript of this communication appears in: Angew. Chem. Suppl. 1983, 70. DOI:10.1002/anie.198300700
Transition‐Metal Substituted Stibanes as Acceptors: Cp(CO)(L)FeSbBr2 · PMe3 (L = CO, Me3P, MeNC)— 1 : 1‐Ferriostibane‐Trimethylphosphane Complexes
Authors: Kaul Hans‐Achim , Greissinger Dieter , Malisch Wolfgang , Klein Heinz‐Peter , Thewalt Ulf 
Published: December 2003

AbstractThe complete manuscript of this communication appears in: Angew. Chem. Suppl. 1983, 47. DOI:10.1002/anie.198300470
Diastereo‐ and Enantioselective Synthesis of (1R,3R)‐Caronaldehyde Acid Methyl Ester and (1R,3R)‐Chrysanthemic Acid Methyl Ester from (R)‐Glycerinaldehyde Acetonide
Authors: Mulzer Johann , Kappert Michael 
Published: December 2003

AbstractThe complete manuscript of this communication appears in: Angew. Chem. Suppl. 1983, 23. DOI:10.1002/anie.198300230
Expansion of Three‐Membered Heterocycles to Five‐Membered Cyclic Carbenes—Novel Reactions of Aziridine, Oxirane, and Thiirane with CO and CS Ligands in Iron, Ruthenium, and Manganese Complexes
Authors: Singh Mono M. , Angelici Robert J. 
Published: December 2003

AbstractThe complete manuscript of this communication appears in: Angew. Chem. Suppl. 1983, 184. DOI:10.1002/anie.198301840
Dye Diffusion Systems in Color Photography
Authors: Van de Sande Christian C. 
Published: December 2003

AbstractDye diffusion instant color photography has been a commercial success ever since its introduction in 1963. No doubt this is partly due to the spectacular nature of this innovation, and for the same reason it has never really rid itself of its gadget image. Moreover, the picture quality was inferior to that of traditional color photography. Photographic materials are now available whose image quality approaches that of the traditional color print. It is not well known that chemistry, and organic chemistry in particular, is the cornerstone of these new photographic products. Insights from this field have spurred creativity, not only in the fields of dye and polymer chemistry, but above all in the search for more efficient and, hopefully better, dye diffusion transfer systems. The result of all these efforts is a finely tuned microscale chemical factory which continues to open rewarding perspectives for the photographic industry.
Allyl(hydrido)platinum(II)‐Catalyzed Partial Hydrogenation of Dienes
Authors: Bertani Roberta , Carturan Giovanni , Scrivanti Alberto 
Published: December 2003

AbstractThe complete manuscript of this communication appears in: Angew. Chem. Suppl. 1983, 228. DOI:10.1002/anie.198302280
The Structure of Tris(diphenylthiophosphinoyl)methanide, a Mesomerically Stabilized Carbanion
Authors: Grim Samuel O. , Gilardi Richard D. , Sangokoya Samuels A. 
Published: December 2003

AbstractThe complete manuscript of this communication appears in: Angew. Chem. Suppl. 1983, 271. DOI:10.1002/anie.198302710
Formation, Structure, and Synthetic Use of Gluco‐ and Galactopyranoside Acetophenone Acetals with 1,3‐Dioxane Rings
Authors: Lipták András , Fügedi Péter 
Published: December 2003

AbstractThe complete manuscript of this communication appears in: Angew. Chem. Suppl. 1983, 254. DOI:10.1002/anie.198302540
Magic‐Angle‐Spinning NMR (MAS‐NMR) Spectroscopy and the Structure of Zeolites
Authors: Fyfe Colin A. , Thomas John M. , Klinowski Jacek , Gobbi Gian C. 
Published: December 2003

AbstractAfter outlining the chemical features and properties which make zeolites such an important group of catalysts and sorbents, the article explains how high‐resolution solid‐state NMR with magic‐angle spinning reveals numerous new insights into their structure.29Si‐MAS‐NMR readily and quantitatively identifies five distinct Si(OAl)n(OSi)4‐nstructural groups in zeolitic frameworks (n = 0, 1,….4), corresponding to the first tetrahedral coordination shell of a silicon atom. Many catalytic and other chemical properties of zeolites are governed by the short‐range Si, Al order, the nature of which is greatly clarified by29Si‐MAS‐NMR. It is shown that, as expected from Pauling's electroneutrality principle and Loewenstein's rule, both in zeolite X and in zeolite A (with Si/Al = 1.00) there are no AlOAl linkages. In zeolite A and zeolite X with Si/Al = 1.00 there is strict alternation of Si and Al on the tetrahedral sites. Ordering models for Si/Al ratios up to 5.00 (in zeolite Y) may also be evaluated by a combination of MAS‐NMR experiments and computational procedures.29Si‐MAS‐NMR spectra reveal the presence of numerous crystallographically distinct Si(OSi)4sites in silicalite/ZSM‐5, suggesting that the correct space group for these related porosilicates is not Pnma.27Al‐MAS‐NMR clearly distinguishes tetrahedrally and octahedrally coordinated aluminum, proving that, contrary to earlier claims, Al in silicalite is tetrahedrally substituted within the framework. In combination,29Si‐ and27Al‐MAS‐NMR is a powerful tool for monitoring the course of solid‐state processes (such as ultrastabilization of synthetic faujasites) and of gas‐solid reactions (dealumination of zeolites with silicon tetrachloride vapor at elevated temperatures). They also permit the quantitative determination offrameworkSi/Al ratios in the region 1.00 < Si/Al < 10 000. Since most elements in the periodic table may be accommodated within zeolite structures, either as part of the exchangeable cations or as building units of the anionic framework, there is immense scope for investigation by MAS‐NMR and its variants (cross‐polarization, multiple pulse and variable‐angle spinning) of bulk, surface and chemical properties. Some of the directions in which future research in zeolite science may proceed are adumbrated.
Seleno‐ and Telluroformaldehyde as Bridging Ligands in Organometallic Complexes
Authors: Herrmann Wolfgang A. , Weichmann Josef , Serrano Ricardo , Blechschmitt Klaus , Pfisterer Heike , Ziegler Manfred L. 
Published: December 2003

AbstractThe complete manuscript of this communication appears in: Angew. Chem. Suppl. 1983, 363. DOI:10.1002/anie.198303630
[Co3{μ3‐S}{o‐(SCH2)2C6H4}3]2−: The First Trinuclear Cobalt Cluster with Tetrahedral CoS4‐Coordination
Authors: Henkel Gerald , Tremel Wolfgang , Krebs Bernt 
Published: December 2003

AbstractThe complete manuscript of this communication appears in: Angew. Chem. Suppl. 1983, 307. DOI:10.1002/anie.198303070
From Environmental Analytical Chemistry to Ecotoxicology—A Plea for More Concepts and Less Monitoring and Testing
Authors: Stumm Werner , Schwarzenbach René , Sigg Laura 
Published: December 2003

AbstractThe development of cultural and technical civilization has been marked with increasing interference in hydrogeochemical cycles and the production of a growing number of chemicals; this is accompanied by a growing concern on the potential adverse effects of chemicals on biological systems. Assessment of the potential toxicological and ecological effects of pollutants is of central importance. We are of the opinion that this cannot be accomplished by merely evaluating the harmfulness of a substance on the basis of toxicity tests with individual organisms and by monitoring analytically the environment for pollutants. We would like to encourage chemists to participate in the solution of ecotoxicological problems: chemodynamical concepts permit the estimation‐on the basis of physical‐chemical generalizations and with the help of compound‐specific data‐of the fate, the distribution, the potential for bioaccumulation in the food chain, and the approximate residence time of pollutants (and thus the attainable residual concentrations) in the environment and therefore to predict the relative risk of different pollutants.
The Tricyclo[9.3.1.03,8]pentadecane System— A Short Synthesis of a C‐Aromatic Taxane Skeleton
Authors: Shea Kenneth J. , Davis Peter D. 
Published: December 2003

AbstractThe complete manuscript of this communication appears in: Angew. Chem. Suppl. 1983, 564. DOI:10.1002/anie.198305640
The Zirconocene‐Induced Coupling of Butadiene with Carbonyl Compounds
Authors: Erker Gerhard , Engel Klaus , Atwood Jerry L. , Hunter William E. 
Published: December 2003

AbstractThe complete manuscript of this communication appears in: Angew. Chem. Suppl. 1983, 675. DOI:10.1002/anie.198306750
(PhCCLi)4(tmhda)2, A Polymeric Organolithium Compound with cubic Li4C4 Structural Units
Authors: Schubert Bernd , Weiss Erwin 
Published: December 2003

AbstractThe complete manuscript of this communication appears in: Angew. Chem. Suppl. 1983, 703. DOI:10.1002/anie.198307030