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

17.6.3.3 Synthesis by Substituent Modification .................................... 1009<br />

17.6.3.3.1 Substitution <strong>of</strong> Existing Substituents ...................................... 1009<br />

17.6.3.3.1.1 Method 1: Substitution <strong>of</strong> Alkoxy Groups Bonded to<br />

1,3,5,7-Tetrazocines ...................................... 1009<br />

17.6.4 Product Subclass 4: Heteronines and Oligoheteronines ................. 1010<br />

17.6.4.1 Synthesis by Ring-Closure Reactions ...................................... 1010<br />

17.6.4.1.1 By Formation <strong>of</strong> Two C—C Bonds ......................................... 1010<br />

17.6.4.1.1.1 Method 1: Oxonins and Thionins by Condensation <strong>of</strong> Dialdehydes<br />

with Symmetrical Bis(phosphonium) Salts ................. 1010<br />

17.6.4.2 Synthesis by Ring Transformation ......................................... 1011<br />

17.6.4.2.1 Valence Isomerization <strong>of</strong> Heterobicyclo[6.1.0]nona-2,4,6-trienes and<br />

Related Compounds ..................................................... 1011<br />

17.6.4.2.1.1 Method 1: By Photolysis <strong>of</strong> Oxa- or Azabicyclo[6.1.0]nona-2,4,6-trienes 1011<br />

17.6.4.2.1.2 Method 2: By Cycloaddition/Cycloreversion <strong>of</strong> Oxa- or Azabicyclo[6.1.0]nona-2,4,6-trienes<br />

with 3,6-Diphenyltetrazine,<br />

Followed by Oxidation .................................... 1012<br />

17.6.4.2.1.3 Method 3: By Cycloaddition/Cycloreversion <strong>of</strong> Azabicyclo[5.2.0]nonatrienes<br />

with Pyranones, Followed by Dehydrogenation ..... 1012<br />

17.6.4.2.2 Valence Isomerization <strong>of</strong> syn-s-Homobenzene Systems .................... 1013<br />

17.6.4.2.2.1 Method 1: Synthesis <strong>of</strong> Trioxonins and Triazonines by Cycloreversion<br />

Reactions ................................................ 1013<br />

17.6.4.2.2.2 Method 2: By Thermolysis <strong>of</strong> 1,2,3,4,5,6-Hexamethyl-9-phenyl-7,8,9triazatricyclo[4.3.0.0<br />

2,5 ]nona-3,7-diene .................... 1014<br />

17.6.5 Product Subclass 5: Heteroannulenes ................................... 1015<br />

17.6.5.1 Synthesis by Ring-Closure Reactions ...................................... 1015<br />

17.6.5.1.1 By Formation <strong>of</strong> Two C—C Bonds ......................................... 1015<br />

17.6.5.1.1.1 Method 1: Heteroannulenes, Bridged Heteroannulenes, and Benz<strong>of</strong>used<br />

Bridged Heteroannulenes by Cyclization <strong>of</strong><br />

Dialdehydes with Symmetrical Bis(phosphonium) Salts ..... 1015<br />

17.6.5.1.2 By Formation <strong>of</strong> One C—C Bond .......................................... 1017<br />

17.6.5.1.2.1 Method 1: Bridged Aza[10]annulenes by Cyclization <strong>of</strong><br />

Cycloheptatrienyl Isocyanates ............................ 1017<br />

17.6.5.2 Synthesis by Ring Transformation ......................................... 1017<br />

17.6.5.2.1 Beckmann Rearrangement ............................................... 1017<br />

17.6.5.2.1.1 Method 1: Methanoaza[10]- and Methanoaza[12]annulenes from<br />

Bridged Tricyclic Oximes .................................. 1017<br />

17.6.5.2.2 Valence Isomerization <strong>of</strong> Tetracyclopolyenes .............................. 1018<br />

17.6.5.2.2.1 Method 1: Oxa[n]annulenes and Aza[n]annulenes (n = 13–18) by Photolysis<br />

<strong>of</strong> Tetracyclic Epoxides, Aziridines, and Related Compounds 1018<br />

17.6.5.2.2.1.1 Variation 1: By Photolysis <strong>of</strong> 11-Oxatetracyclo[6.5.0.0 9,13 .0 10,12 ]trideca-2,4,6triene<br />

and Similar Compounds ............................ 1018

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