Thermal Reactions Formally Involving No Other Species

Thermal Reactions Formally Involving No Other Species 

Rearrangements of the van Alphen-Hiittel type, involving migrations of carbon-linked substituents around the ring, and characteristic of the 2H-and 3//-pyrroles, the 3H- and 4//-pyrazoles, and the 2i/-imidazoles, are rare among 4//-imidazoles because of lack of suitably substituted examples. A number of other thermal reactions are known, including the extensively studied rearrangements of structure types 2 and 21. 

When a 4-methyl group is present, the reaction follows a different course (Section IV,D,l,c) earlier claims of an acid-catalyzed rearrangement to the isomeric 4-hydroxymethyl-l//-imidazole were later corrected.  

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A. Thermal Reactions Formally Involving No Other Species... 

Azolinones, azolinethiones, azolinimines N-Oxides, N-imides, N-ylides of azoles Thermal and Photochemical Reactions Formally Involving No Other Species 2.1 Thermal fragmentation... 

Thermal and photochemical reactions formally involving no other species... 

Reactions Formally Involving No Other Species (Except as Trapping Agents) S.OS.3.2.1 Thermal and photochemical reactions... 

Thermal and photochemical reactions formally involving no other species Electrophilic attack at ring oxygen Electrophilic attack at ring nitrogen Electrophilic attack at ring carbon... 

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