Y-aromaticity

Lee, S. L., de Wind, M., Desal, P. H., Johnson, C., and Asim, M, Y., Aromatics Reduction and Cetane Improvement of Diesel Fuels," Catalyst Chemical Seminar, Dallas, Texas, October 12, 1993. 

Groupe TBI is investing about FFr3m to build a 15,0001/ y aromatic polyester polyols plant on a greenfield site at Issoire, near Lyons. The novel, patented process uses postconsumer waste bottles made from PETP as feedstock. PU and modified PIR foams made using the APPs have excellent fire performance and good dimensional stability. GROUPE TBI... 

Attempted preparation of unsubstituted trimethylenemethane dication, 58, by treatment of 2-(chloromethyl)-3-chloropropene (57) with SbFs in SO2CIF at -120°C was also unsuccessful, further showing that the Y-aromaticity is unimportant in this system. 

Nagashima, F., Murakami, Y., and Asakawa, Y., Aromatic compounds from the Ecuadorian liverwort Marchesinia brachiata a revision, Phytochemistry, 51, 1101, 1999. 

By ionizing the respective alkenediol, Olah and co-workers403 were able to prepare the (hexaphenyltrimethylene)methane dication 188 [Eq. (3.47)] 403 The dication possesses C3 symmetry and adopts a propeller-like structure, but no evidence for Y-aromatic stabilization was found. Furthermore, the phenyl groups themselves are twisted, which prevents the optimum overlap between the 7t-system and the vacant p-orbitals at the three C(2) carbon atoms. Calculated charge density distributions and the 13C NMR data show that C(l) is not significantly deshielded for an sp2 atom, indicating that the three C(2) carbon atoms and their phenyl substituents bear the charge of dication 188 similar to the trityl cation 135. 

Ancamine Y Aromatic amine Increased pot life over Resolution... 

Aromatic is defined as a substance "characterized by a fragrant smell, and usually a by a warm, pungent taste." (Merriam-Webster New International Dictionary). Reviews Garratt, P. J. "Aromaticity," Wiley, NY 1986. Minkin, V. J. Glukhovtsev, M. N. Simkin, B. Y. "Aromaticity and Antiaromaticity Electronic and Structural Aspects," Wiley, NY 1994. 

Minkin, V. L Glukhovtsev, M. N. Simkin, B. Y. Aromaticity and Antiaromaticity Electronic and Structural Aspects, John Wiley Sons New York, 1994. 

J. Klein, Directive effects in allylic and benzylic polymethylations The question of U-stabilization, Y-aromaticity and cross-conjugation. Tetrahedron 39, 2733-2759 (1983). 

Cm=3C when hydrogen is oxidized on permeate side Cm>95% higher C y (aromatics) when using membrane reactor... 

Gund, P. (1972) Guanidine, trimethylenemethane and y-delocalization, Can arylic compounds have aromatic stability. Journal of Chemical Education, 49, 100-103 Klein, J. (1983) Directive effects in allylic and benzylic polymetalations the question of u-stabilization, y-aromaticity and cross-conjugation. Tetrahedron, 39, 2733-2759. 

Ozden, S., Shaov, A.H., Charayev, A.M., Mikitaev A.K., Bedanokov A.Y. Aromatic block copolyesters stabilised with metallie salts of phosphinic ac A.-Polymers and Polymer Composites.-lQQ. -No. 9.-No 3.-P. 213-219. 

Moritani 1, Fujiwara Y. Aromatic substitution of styrene-palladium chloride complex. Tetrahedron Lett. 1967 8(12) 1119-1122. 

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