@article {45693,
	title = {Odd-even alternation in tautomeric porous organic cages with eceptional chemical stability},
	journal = {Angewandte Chemie-International Edition},
	volume = {56},
	year = {2017},
	month = {FEB},
	pages = { 2123-2126},
	type = {Article},
	abstract = {Amine-linked (C-NH) porous organic cages (POCs) are preferred over the imine-linked (C= N) POCs owing to their enhanced chemical stability. In general, aminelinked cages, obtained by the reduction of corresponding imines, are not shape-persistent in the crystalline form. Moreover, they require multistep synthesis. Herein, a one-pot synthesis of four new amine-linked organic cages by the reaction of 1,3,5-triformylphloroglucinol (Tp) with different analogues of alkanediamine is reported. The POCs resulting from the odd diamine (having an odd number of -CH2 groups) is conformationally eclipsed, while the POCs constructed from even diamines adopt a gauche conformation. This odd-even alternation in the conformation of POCs has been supported by computational calculations. The synthetic strategy hinges on the concept of Schiff base condensation reaction followed by keto-enol tautomerization. This mechanism is the key for the exceptional chemical stability of cages and facilitates their resistance towards acids and bases.},
	doi = {10.1002/anie.201611260},
	author = {Bera, S. and Basu, A. and Tothadi, S. and Garai, B. and Banerjee, S. and Vanka, K. and Banerjee, R.}
}
@article {45609,
	title = {C-F bond activation by saturated NHC: mesoionic compound formation and its unprecedented adduct with B(C6F5)3},
	journal = {Angewandte Chemie - International Edition},
	volume = {58},
	year = {2019},
	month = {FEB},
	pages = {2804-2808},
	type = {Article},
	abstract = {<p>The reaction of SIPr, [1,3-bis(2,6-diisopropylphenyl)-imidazolin-2-ylidene] (1), with C6F6 led to the formation of an unprecedented mesoionic compound (2). The formation of 2 is made accessible by deprotonation of the SIPr backbone with simultaneous elimination of HF. The C-F bond para to the imidazolium ring in 2 is only of 1.258(4) {\r A}, which is the one of the shortest structurally authenticated C-F bonds known to date. The liberation of HF during the reaction is unequivocally proved by the addition of one more equivalent of SIPr, which leads to the imidazolium salt with the HF2- anion. To functionalize 2, the latter reacted with B(C6F5)3 to give an unusual donor{\textendash}acceptor compound, where the fluoride atom from the C6F5 moiety coordinates to B(C6F5)3 and the carbanion moiety remains unaffected. Such coordination susceptibility of the fluoride atom of a nonmetallic system to a main-group Lewis acid (Fnon-metal{\textrightarrow}BR3) is quite unprecedented.</p>
},
	keywords = {C-F activation, carbanions, N-heterocyclic carbenes, structure elucidation, Ylides},
	issn = {1433-7851},
	doi = {10.1002/anie.201814616},
	author = {Pait, M. and Kundu, G. and Tothadi, S. and Karak, S. and Jain, S. and Vanka, K. and Sen, S. S.}
}
