{2,7-Dimethoxy-8-[4-(2-methylpropyl)benzoyl]naphthalen-1-yl}[4-(2-methylpropyl)phenyl]methanone

1 - Fluoro - 2 , 5 - dimethoxy - 4 - nitrobenzene

1-Fluoro-2,5-dimethoxy-4-nitrobenzene was synthesized in 90% yield by the reaction of commercial 2-fluoro-1,4-dimethoxybenzene with nitric acid. The structure was confirmed by X-ray crystallography. The new title compound was characterized by 1H and 13C-NMR, elemental analysis, EI-MS and FT-IR.

[2,7-Dimethoxy-8-(4-methylbenzoyl)-1-naphthyl](4-methylphenyl)methanone

In the title compound, C(28)H(24)O(4), the two 4-methyl-benzoyl groups at the 1- and 8-positions of the naphthalene ring system are aligned almost anti-parallel, the dihedral angle between the two phenyl rings being 9.64 (7)°. The dihedral angles between the two phenyl rings and the naphthalene ring system are 71.82 (6) and 71.58 (6)°. In the crystal, inter-molecular C-H⋯O inter-actions between...

8 .4 % 1 2 .7 % 1 0 .8 % 1 4 .2 % Tourism Economics Summary

1 , 4 - Phenylenebis [ ( 6 , 7 - dimethoxy - 3 , 4 - dihydroisoquinolin - 2 ( 1 H ) - yl ) methanone ]

The compound named in the title was prepared from N1,N4-diphenethylterephthalamide 1. The resulting bis terephthalamide was subjected to an intramolecular α-amidoalkylation reaction with paraformaldehyde in the presence of heterogeneous catalyst TfOH/SiO2 to obtain 1,4-phenylenebis[(6,7-dimethoxy-3,4-dihydroisoquinolin-2(1H)-yl)methanone]. The structure of the newly synthesized compound was det...

1 , 2 , 4 , 8 , . . . What comes next ?

immediately follows from the commutativity of integers. For n = 2 the corresponding identity (x1 + x 2 2)(y 2 1 + y 2 2) = (x1y1 + x2y2) 2 + (x1y2 − x2y1). is not so trivial and has been used by many mathematicians. Diophantos used it sometime between 2nd to 4th century but maybe even he was not the first. The corresponding identity for four squares (x1 + x 2 2 + x 2 3 + x 2 4)(y 2 1 + y 2 2 + ...