125 results on '"Hansen, Hans-Juergen"'
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2. Central-to-axial chirality transfer in the benzannulation reaction of optically pure Fischer carbene complexes in the synthesis of allocolchicinoids
3. Das "Segelschiff" von Caspar David Friedrich. Anmerkungen zu einem von König Maximilian I. erworbenen Gemälde
4. ChemInform Abstract: Formation of 2-(Phenylsulfonyl)resorcinols (= 2-(Phenylsulfonyl)benzene-1,3-diols) from Symmetrically Substituted Maleic Anhydrides (= Furan-2,5-diones).
5. ChemInform Abstract: A New Alkylation Method for Heptalene‐4,5‐dicarboxylates and of One of Their Pseudoester Forms.
6. ChemInform Abstract: Flash Vacuum Pyrolysis of Naphthalen‐1‐yl and ‐2‐yl Prop‐2‐ynoate.
7. ChemInform Abstract: Nucleophilic Reactions of 9‐Isopropyl‐2,4‐dimethoxy‐7,12‐dimethyl‐3‐(phenylsulfonyl)benzo [a]heptalene with Lithium Dialkylamides.
8. ChemInform Abstract: An Improved and Simplified Synthesis of 4-Styrylazulenes.
9. ChemInform Abstract: Formation of 3-Sulfonyl-Substituted Benzo[1]heptalene-2,4-diols from Heptalene-1,2-dicarboxylates and Lithiomethyl Phenyl Sulfones.
10. ChemInform Abstract: Synthesis of 6-Styrylheptalenes.
11. ChemInform Abstract: Synthesis of (P)- and (M)-6,7-Bis[(diphenylphosphanyl)methyl]-8,12-diphenylbenzo[a]heptalenes - Potential Ligands for Homogeneous Asymmetric Catalysis.
12. ChemInform Abstract: Convergent Synthesis of Fully Functionalized Ring C Allocolchicinoids. Benzannulation Approach.
13. ChemInform Abstract: From Phenols to Azulenes: An Extended and Versatile Route to Polyalkylated Azulenes with Variable Substitution Patterns at the Seven- and Five-Membered Ring.
14. ChemInform Abstract: A Novel Route to 1-Substituted 3-(Dialkylamino)-9-oxo-9H-indeno[2,1-c]pyridine-4-carbonitriles.
15. Formation of 6,10-Diphenyl-Substituted Heptalene-4,5-dicarboxylates.
16. A Practical and User-Friendly Method for the Selenium-Free One-Step Preparation of 1,2-Diketones and Their Monoxime Analogues.
17. Thermodecarbonylation of ?-Substituted Cycloalkanones: A Convenient One-Carbon Ring Contraction Method.
18. An Unusual Domino Retro-Ene—Conia Reaction: Regio- and Stereoselective One-Carbon Ring Expansion of Fenchol Derivatives.
19. Thermal Isomerization of Isoborneols and Dehydroisoborneols to New Chiral Building Blocks in Terpenoids Synthesis.
20. Three-Carbon Ring Expansion by Cyclopropane Insertion: Macrocyclic Musks from Readily Available C-12 Starting Materials.
21. Diradical‐Promoted (n + 2 ‐ 1) Ring Expansion: An Efficient Reaction for the Synthesis of Macrocyclic Ketones.
22. Cyclopropylcarbinyl Radicals as Three‐Carbon Insertion Units: Easy Synthesis of C‐15 Macrocyclic Ketones by Three‐Carbon Ring Expansion.
23. A Novel and Highly Efficient Two‐Carbon Ring Expansion.
24. Stereo- and Regioselectivity in Dynamic Gas-Phase Thermoisomerization (DGPTI): Novel Route to α-Campholanic Acid and Derivatives.
25. Novel Diradical-Mediated Ring Opening Reactions.
26. Stereoselectivity of the Benzannulation Reaction: Efficient Central‐to‐Axial Chirality Transfer.
27. ChemInform Abstract: Synthesis of Benzo[a]heptalenes via Benzanellation—Aromatization Sequence.
28. ChemInform Abstract: Short and Versatile Two‐Carbon Ring Expansion Reactions by Thermo‐Isomerization: Novel Straightforward Synthesis of (.+‐.)‐Muscone, Nor‐ and Homomuscones, and Further Macrocyclic Ketones.
29. ChemInform Abstract: A Novel, Short and Repeatable Two‐Carbon Ring Expansion Reaction by Thermo‐Isomerization: Easy Synthesis of Macrocyclic Ketones.
30. ChemInform Abstract: Unexpected Thermal Transformation of Aryl 3‐Arylprop‐2‐ynoates: Formation of 3‐(Diarylmethylidene)‐2,3‐dihydrofuran‐2‐ones.
31. ChemInform Abstract: Studies for a Variable Synthesis of Colchicinoids: Construction of Ring A on a Heptalene Moiety.
32. ChemInform Abstract: Synthesis of Polyalkylphenyl Prop‐2‐ynoates and Their Flash Vacuum Pyrolysis to Polyalkylcyclohepta[b]furan‐2(2H)‐ones.
33. ChemInform Abstract: A Detailed Investigation of the Reaction of 5,9‐Diphenylbenz[a]azulene with Dialkyl Acetylenedicarboxylates Leading to Dialkyl 8,12‐Diphenylbenzo[a]heptalene‐6,7‐dicarboxylates.
34. ChemInform Abstract: New Syntheses of Di‐π‐Substituted Heptalenes.
35. ChemInform Abstract: Formation of Unusual Products from the Acid‐Catalyzed Reaction of Azulenes with Dimethyl Acetylenedicarboxylate.
36. Thermodecarbonylation of α-substituted cycloalkanones: a convenient one-carbon ring contraction method
37. Cyclopropylcarbinyl radicals as three-carbon insertion units: easy synthesis of C-15 macrocyclic ketones by three-carbon ring expansion
38. ChemInform Abstract: KINETIK UND STEREOCHEMISCHER VERLAUF DER THERMISCHEN UMLAGERUNG DER VIER STEREOISOMEREN PROPENYL-(BUTEN-(2′)-YL)-AETHER
39. ChemInform Abstract: AROMATISCHE (1,5S)-SIGMATROPISCHE H-VERSCHIEBUNGEN IN ARYLALLENEN
40. ChemInform Abstract: ALKALOIDE 153. MITT. OXIDATIVE KUPPLUNG VON INDOLINEN UND 1,2,3,4-TETRAHYDROCHINOLINEN MIT KALIUMPERMANGANAT
41. ChemInform Abstract: PHOTOREAKTIONEN 38. MITT. SYNTHESE VON 2H-ISOINDOL-4,7-DIONEN DURCH PHOTOCHEMISCHE CYCLOADDITION VON 2,3-DIPHENYL-2H-AZIRIN AN 1,4-CHINONE
42. ChemInform Abstract: PHOTOREAKTIONEN 40. MITT. PHOTOINDUZIERTE REAKTIONEN VON 3-PHENYL-2H-AZIRINEN MIT CARBONSAEUREESTERN
43. ChemInform Abstract: SAEUREKATALYSIERTE DIENON-PHENOL-UMLAGERUNGEN VON 6-PROPARGYL-6-METHYL-CYCLOHEXA-2,4-DIEN-1-ONEN, LADUNGSKONTROLLIERTE, AROMATISCHE (1S,2S)- UND (3S,4S)-SIGMATROPISCHE REAKTIONEN
44. ChemInform Abstract: PHOTOREACTIONS PART 39, PHOTOCHEMICAL CYCLIZATION OF ALLYLATED ANISOLE AND N‐ALKYL ANILINE DERIVATIVES
45. ChemInform Abstract: PHOTOREAKTIONEN 30. MITT. ZUR PHOTOCHEMIE VON 3,5-DIARYL-2-ISOXAZOLINEN
46. ChemInform Abstract: SAEUREKATALYISERTE UMLAGERUNG VON 4-ALLYL-CYCLOHEX-2-EN-1-OLEN, BEISPIELE FUER LADUNGSKONTROLLIERTE (3S,4S)-UMLAGERUNGEN VON CYCLISCHEN ALLYLKATIONEN
47. ChemInform Abstract: PHOTOREAKTIONEN 35. MITT. PHOTOCHEMISCHE CYCLOADDITIONEN VON 3-PHENYL-2H-AZIRINEN AN CARBONSAEURECHLORIDE
48. ChemInform Abstract: PHOTOREAKTIONEN 33. MITT. PHOTOCHEMISCHE CYCLOADDITIONEN VON 3‐PHENYL‐2H‐AZIRINEN MIT KETONEN, ACYLCYANIDEN UND KETOESTERN
49. ChemInform Abstract: LADUNGSINDUZIERTE UMLAGERUNG VON ALLYL‐ARYLAETHERN MIT TRIFLUORESSIGSAEURE
50. ChemInform Abstract: PHOTOCHEMISCHE CYCLOADDITIONEN VON 3‐PHENYL‐2H‐AZIRINEN MIT ALDEHYDEN
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