904368-96-3

Upstream product

• 904368-94-1 3,3-dipropyl-1,2,3,8-tetrahydroazulen-1-one 
• 1576-35-8 toluene-4-sulfonic acid hydrazide 
• 904368-92-9 1-cyclohepta-1,3,5-trienyl-3-hydroxy-3-propyl-hexan-1-one 
• 123-19-3 4-heptanone 
• 55904-99-9 4,4-dimethoxyheptane 
• 287114-82-3 trimethylsilyl enol ether of 1-acetylcyclohepta-1,3,5-triene 

Relevant academic research and scientific papers

Synthesis and stability of 1,1-dialkyl-1H-azulenium cations

Starting from trimethylsilyl enol ether of 1-acetyl-1,3,5-cycloheptatriene, the title 1,1-dimethyl-, 1,1-diethyl-, and 1,1-dipropyl-1H-azulenium cations 6-8 were synthesized in five steps. The order of pKR+ values of these cations was found to be 7>8>6. A comparison of the values between 1,1-dialkyl- and 1,1-spiroalkylated 1H-azulenium cations with the same number of carbon atoms at the 1-position provided the results of 7>1 and 8R+ value to those of 3 and 7 probably due to its slightly bulkier propyl groups from which solvation stabilization of 8 under the conditions suffers. An intermolecular charge-transfer interaction between the cations and dibenzo-24-crown-8 was also studied.