(3-Ethyl-6,7-dimeth­oxy­naphthalen-1-yl)(phen­yl)methanone

The asymetric unit of the title mol­ecule, C21H20O3, contains two crystallographically independent mol­ecules, A and B, which differ in the orientation of the ethyl group substituted on the naphthalene system; the dihedral angles between the ethyl group and the naphthalene system are 7.4 (3) and 68.1 (3)°, respectively, for mol­ecules A and B. The dihedral angles between the benzoyl and naphthalene groups are 64.7 (7) and 69.4 (8)°, respectively, for mol­ecules A and B. The crystal structure features four aromatic π–π stacking interactions [centroid–centroid distances = 4.181 (1), 3.891 (1), 4.423 (1) and 4.249 (1) Å]

1-Benzoyl-4-(4-methyl­phen­yl)phthal­azine

In the title mol­ecule, C22H16N2O, the tolyl and benzoyl rings make dihedral angles 50.2 (5) and 56.4 (5)°, respectively, with the phthalazine ring system while the dihedral angle between the tolyl and benzoyl rings is 0.70 (4)°. The crystal structure is stabilized by inter­molecular C—H⋯O and C—H⋯N hydrogen bonds, as well as weak C—H⋯π inter­actions

Synthesis of Naphthalene Amino Esters by the Blaise Reaction of <i>o</i>‑Alkynylarenenitriles

The action of a Reformatsky reagent on <i>o</i>-alkynylarenenitriles provides a convenient access to naphthalene amino esters <i>via</i> tandem 6-<i>endo-dig</i> carbannulation of <i>in situ</i> generated Blaise reaction intermediates. The products are formed in moderate to good yields with high chemo- and regioselectivity

Synthesis of Naphthalene Amino Esters by the Blaise Reaction of <i>o</i>‑Alkynylarenenitriles

The action of a Reformatsky reagent on <i>o</i>-alkynylarenenitriles provides a convenient access to naphthalene amino esters <i>via</i> tandem 6-<i>endo-dig</i> carbannulation of <i>in situ</i> generated Blaise reaction intermediates. The products are formed in moderate to good yields with high chemo- and regioselectivity

Assessment of glaucoma using extreme learning machine and fractal feature analysis

Letter to the edito

Growth and Characterization of Organic 2-Chloro 5-Nitroaniline Crystal Using the Vertical Bridgman Technique

In this article, we discuss the preparation of organic 2-chloro-5 nitroaniline (2C5NA) crystals and their different kinds of physical, chemical, and mechanical properties. The vertical Bridgman approach was used to effectively produce the bulk organic 2C5NA crystal. To produce a good-quality bulk crystal, the shape, dimensions, and cone angle of the ampoule were optimized. Also, the temperature profile was set for the 2C5NA crystal. The growth atmosphere and the lowering rate were identified to obtain a homogeneous mixture of the compounds and initiate the nucleation process. Single-crystal X-ray diffraction (XRD), powder XRD, proton Fourier transform nuclear magnetic resonance (FT-NMR), and Fourier transform infrared investigations were used to confirm the crystal structure, molecular structure, and presence of functional groups in the formed crystal. The formed crystal has a monoclinic crystal structure with the space group P21/c, according to single-crystal XRD analysis. The thermal stability and kinetic parameters were examined using thermogravimetric analysis and differential thermal curves. From dielectric analysis, the electrical conductivity and dielectric behavior of 2C5NA were investigated with variations in frequency and temperature. The organic 2-chloro-5-nitroaniline crystal demonstrates that the indentation size effect is observed in the Vickers micro-hardness test, which was also carried out