By Ramsay W., Donnan F.G.
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Dendrimers are a category of hugely branched molecules that mix the homes of polymers and small discrete molecules. One categorised one of the unique molecules of chemistry, dendrimers have attracted massive cognizance lately, as their exact host/guest houses and their strength of being functionalized within the outer edge in addition within the middle have ended in new fabrics with a superb capability for functions.
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The relevant data are listed in Table X V I I . The authors interpreted the correlation in terms of the electronattracting field effect of the aromatic π-carbons (inductive effect), which stabilizes the aryl anion. 4 χ 10~ liters/mole sec. 9°) than 30 30 5 D 2» (a) A. I. Shatenshtein and E . A. Izrailevich, Zh. Fiz. , 28, 3 ( 1 9 5 4 ) ; (b) Ε . N. Yurygina, P. P. Alikhanov, E . A. Izrailevich, P. N. Manochkina, and A. I.. Shatenshtein, Zh. Fiz. , 34, 587 ( 1 9 6 0 ) ; (c) A. I. Shatenshtein, Advan.
Bugg, R . Desiderato, and R . L . Sass, J. Am. Chem. Soc, 86, 3157 (1964). 1 2 C O N J U G A T I V E EFFECTS 53 tricyanomethide and pyridinium dicyanomethylide. The tricyanomethide anion was almost planar and trigonal. 13 A above the plane occupied by the three nitrogen atoms. Each G—G=N unit made an angle of 3° with respect to its projection in this plane. were coplanar, and the G—C—G bond angle of the side chain was 119°. 13 A above the plane of the ring. Ν Tricyanomethide ion Ν Pyridinium dicyanomethylide A good example of the loss of acidity of a carbon acid due to steric inhibition of resonance of its conjugate base is found in the work of Bartlett and Woods.
Am. Chem. Soc, 86, 2003 (1964). A. Streitwieser, J r . , R . A. Caldwell, and M. R . Granger, J. Am. Chem. Soc, 86, 3578 (1964). 5, triptycene of 38, and methane of 40. Because of the enforced orientation of the orbitals of the triptycyl anion, little charge derealiza tion can occur. Thus the three phenyl groups exert an inductive effect great enough in triptycene to account for about 2 pK units on the MS AD scale. The experiment further suggests that the inductive effects of the phenyl groups in triphenylmethane make a substantial contribution to the acidifying properties of these groups.
A system of physical chemistry by Ramsay W., Donnan F.G.