Synthetic Route of C21H24N2. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: 1,3-Bis(2,4,6-trimethylphenyl)-1,3-dihydro-2H-imidazol-2-ylidene, is researched, Molecular C21H24N2, CAS is 141556-42-5, about Formation and Cycloaddition Reactions of a Reactive Boraalkene Stabilized Internally by N-Heterocyclic Carbene. Author is Chen, Chaohuang; Daniliuc, Constantin G.; Kehr, Gerald; Erker, Gerhard.
The synthesis of element-carbon double bonds is of great importance for the development and understanding of reactive π-bonded systems in chem. The seven-membered heterocyclic system 4b is readily made by internal C-H activation at a pendent iso-Pr Me group of the resp. [(IPr)C6F5BH]+ borenium ion. Subsequent deprotonation with the IMes carbene gives the neutral cyclic boraalkene system 5b. The B:C double bond in compound 5b adds carbon dioxide, CS2, sulfur dioxide, Ph isocyanate, an acetylenic ester or two NO mols. to give the corresponding four-membered ring annulated heterocycles. With sulfur or selenium 5b gives the resp. three-membered ring systems. N2O reacts with 5b to give a mixture of the related oxaborirane 18 and a unique [B]OH containing diazoalkane product 19.
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