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LXIV Table <strong>of</strong> Contents<br />

17.8.1.1.3.1 Method 1: Oxobilanes .............................................. 1104<br />

17.8.1.1.3.1.1 Variation 1: a-Oxobilanes ............................................. 1104<br />

17.8.1.1.3.1.2 Variation 2: b-Oxobilanes ............................................ 1105<br />

17.8.1.1.3.2 Method 2: b-Bilenes ................................................ 1106<br />

17.8.1.1.3.2.1 Variation 1: 1,19-Dimethyl-b-bilenes .................................. 1106<br />

17.8.1.1.3.2.2 Variation 2: b-Bilene-1,19-dicarboxylates .............................. 1107<br />

17.8.1.1.3.3 Method 3: a,c-Biladienes ............................................ 1108<br />

17.8.1.1.3.3.1 Variation 1: Symmetrical 1,19-Dimethyl-a,c-biladiene Salts ............. 1108<br />

17.8.1.1.3.3.2 Variation 2: Unsymmetrical 1,19-Dimethyl-a,c-biladiene Salts .......... 1110<br />

17.8.1.1.3.3.3 Variation 3: 1-Bromo-19-methyl-a,c-biladiene Salts .................... 1115<br />

17.8.1.2 Syntheses <strong>of</strong> Porphyrins .................................................. 1116<br />

17.8.1.2.1 Method 1: From Monopyrrole Tetramerization ....................... 1116<br />

17.8.1.2.2 Method 2: From Dipyrrolic Intermediates: The [2+2] Routes .......... 1124<br />

17.8.1.2.2.1 Variation 1: Using Dipyrromethenes .................................. 1126<br />

17.8.1.2.2.2 Variation 2: Using Dipyrromethanes .................................. 1129<br />

17.8.1.2.2.3 Variation 3: Using Dipyrroketones .................................... 1135<br />

17.8.1.2.3 Method 3: From Tripyrrolic Intermediates: The [3 +1] Route ........... 1138<br />

17.8.1.2.3.1 Variation 1: Using a Tripyrrane and a 2,5-Diformyl-1H-pyrrole .......... 1139<br />

17.8.1.2.3.2 Variation 2: Using a Tripyrrane and a 2,5-Bis[(dimethylamino)methyl]-<br />

1H-pyrrole ............................................... 1141<br />

17.8.1.2.4 Method 4: From Open-Chain Tetrapyrrolic Intermediates ............. 1143<br />

17.8.1.2.4.1 Variation 1: Using a-Oxobilanes ....................................... 1145<br />

17.8.1.2.4.2 Variation 2: Using b-Oxobilanes ...................................... 1147<br />

17.8.1.2.4.3 Variation 3: Using 1,19-Dimethyl-b-bilenes ............................ 1148<br />

17.8.1.2.4.4 Variation 4: Using b-Bilene-1,19-diesters .............................. 1149<br />

17.8.1.2.4.5 Variation 5: Using Other b-Bilenes .................................... 1150<br />

17.8.1.2.4.6 Variation 6: Using 1,19-Dimethyl-a,c-biladienes ........................ 1151<br />

17.8.1.2.4.7 Variation 7: Using 1-Bromo-19-methyl-a,c-biladienes .................. 1159<br />

17.8.1.2.4.8 Variation 8: Using Other a,c-Biladienes ................................ 1159<br />

17.8.2 Product Subclass 2: Reduced Porphyrins ................................ 1161<br />

17.8.2.1 Chlorins (b,b¢-Dihydroporphyrins) ........................................ 1161<br />

17.8.2.1.1 Method 1: By Ring Synthesis ........................................ 1161<br />

17.8.2.1.2 Method 2: By Reduction <strong>of</strong> Porphyrins or Metal Porphyrinates ......... 1165<br />

17.8.2.1.3 Method 3: By Oxidation <strong>of</strong> Porphyrins or Metal Porphyrinates ......... 1171<br />

17.8.2.2 Bacteriochlorins and Isobacteriochlorins (b,b¢,b¢¢,b¢¢¢-Tetrahydroporphyrins) 1173<br />

17.8.2.3 Syntheses <strong>of</strong> Benzoporphyrins ............................................ 1174<br />

17.8.2.3.1 Method 1: Tetrabenzoporphyrins .................................... 1175<br />

17.8.2.3.2 Method 2: Monobenzoporphyrins, Dibenzoporphyrins, and<br />

Benzoporphyrin Derivatives ............................... 1178<br />

17.8.3 Product Subclass 3: Isomeric, Contracted, and Expanded<br />

Porphyrin Systems ..................................................... 1180<br />

17.8.3.1 Syntheses <strong>of</strong> [18]Porphyrin (1,1,1,1) Isomers ............................... 1180<br />

17.8.3.1.1 Method 1: Porphycene {[18]Porphyrin (2,0,2,0)} ...................... 1180<br />

17.8.3.1.2 Method 2: Corrphycene (Porphycerin) {[18]Porphyrin (2,1,0,1)} ........ 1181

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