484 results on '"H J Hansen"'
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52. Best Route to γ-Tropolone
53. Synthesis from Phenols by Dihalocarbene Addition
54. 1,3,5,7-Tetrasubstituted -Indacenes and Their Heteroatom Analogues
55. Photooxygenation of Ethyl 4,5-Dioxymethylenecyclohepta-2,4,6-trienecarboxylate
56. Tropylium Salts by Alkylation of Tropones and Tropothiones
57. Syntheses by [6 + 1] Combinations
58. Reduction of (Dihalomethyl)cyclohexadienones with Polymer-Bound Dibutyltin Hydride
59. Azulenes and Benzazulenes
60. Heteroanalogues of Tropolones
61. Cycloheptatrienylium (Tropylium) Salts
62. Reaction with (2)-But-2-enedinitrile
63. β-Tropolone Formation on Basic Cleavage of 2,2-Dimethoxy-8-oxabicyclo[3.2.1]oct-6-en-3-ones
64. 1,3,5,7-Tetra--butyl--indacene by Acid-Catalyzed Condensation
65. Alkylation of Heptalene Lactones with [(Phenylsulfonyl)methyl]lithium
66. Elimination of Hydrogen Bromide from 1-Bromo-1,2-dihydropentalene Followed by Dimerization
67. Benz[]azulenes by the Buchner Reaction of Cyclopent[]azulenes
68. Ring Enlargement of Benzene Derivatives
69. Cyclopropanation of Buta-1,3-dienes with Vinylcarbenes Followed by Cope Rearrangement
70. Platinum(IV)-Catalyzed Ring Closure of 1,2-Bis(phenylethynyl)benzenes
71. Reaction of Highly Methylated 2-Cyclohepta[]furan-2-ones with Enol Ethers or Enamines
72. Chlorocarbene Addition to Silyl Enol Ethers
73. Benzopentalenes and Their Heteroatom Analogues
74. Methyl Azulene-2-carboxylates by the Hafner Method
75. Synthesis of Methyl (Azulen-2-yl)acetates
76. Oxidation of Cycloheptatrienes with Nitrosyl Tetrafluoroborate
77. Decarboxylation of Dimethyl Benzo[]heptalene-6,7-dicarboxylate
78. Synthesis of Product Subclass 1
79. Aryl-Substituted Tropylium Ions by Arylation of the Parent Ion
80. Reaction of Substituted Tropone Dimethyl Ketals with Dimethyl Acetylenedicarboxylate
81. Reaction with Dimethyl (2)-But-2-enedioate
82. Methoxy-Substituted Benzo[]heptalenes from Colchiceines
83. Of 2-(Cyclopenta-2,4-dien-1-ylidene)-1,3-dioxolane and 2-Pyran-2-one
84. Reaction of 5-[(Dimethylamino)methylene]cyclopenta-1,3-dienecarbaldehyde with an Allylidenephosphorane
85. β-Tropolones from -Quinones and Triphenylbismuthonium 2-Oxoalkalides
86. Benz[]azulenes by Construction of the Benzo Ring
87. Tropones via Halotropylium Ions as Reactive Intermediates
88. Cycloaddition of Furans and 1,1,3,3-Tetrachloro-2-oxidopropenylium Cation
89. Benzopentalenes by Flash-Vacuum Pyrolysis of Benzofurandiones
90. Tropones
91. Base-Catalyzed Rearrangement of 7,7-Dichloro-4-isopropylidenebicyclo[3.2.0]hept-2-en-6-ones
92. Tropones from [4 + 2] Cycloaddition of Benzo-1,2-quinones and Arylalkynes
93. Formation of Azatropylium (Azepinium) Ions
94. Reaction of Functionalized Buta-1,3-dienes and Tetrachlorocyclopropene
95. Azulenes
96. Reactions of 2-Cyclohepta[]furan-2-ones with Vinyl Ethers, Acetals, Ortho Esters, or Their Analogues
97. Monocyclic Arenes, Quasiarenes, and Annulenes
98. Pentalene Dimers
99. β-Tropolones from -Quinones and 2-Methylquinolines
100. 1,3,5,7-Tetra--butyl--indacene by Cyclocondensation
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