3,3′-(p-Phenyl­ene)bis­(3,4-dihydro-2H-1,3-benzoxazine)

Mol­ecules of the title compound, C22H20N2O2, are situated on crystallographic centres of symmetry. The oxazinane ring adopts a sofa conformation. Mol­ecules are linked into cyclic centrosymmetric dimers via C—H⋯O hydrogen bonds with the motif R 2 2(6). In addition to the C—H⋯O inter­actions, the crystal structure is also stabilized by C—H⋯π inter­actions

<smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="metricconverter"> ¹H and ¹³C NMR studies of some 1,1-bis(carbethoxy)-2-aryl-4-phenyl/(4-chlorophenyl)-4-oxobutane and their derivatives </smarttagtype>

917-922 The 1H and 13C NMR spectral features of 1,1-bis(carbethoxy)-2-aryl-4-phenyl/(4-chlorophenyl)-4-oxobutane 1a-j and their carbonyl derivatives 2a-e are discussed in the light of their diastereotopic characteristics and preferred conformational structures for 1 and 2 are proposed. </smarttagtype

Synthesis and biological activity of 6-alkyl/chloro-3-{4-(6-alkyl/chloro-2H-benzo[e][1,3]oxazin-3(4H)-yl)phenyl}-3,4-dihydro-2H-benzo[e][1,3]oxazines

1083-1087The efficient synthesis of symmetrical bis-benzoxazines using microwave irradiation is described and the possibility of a multicomponernt approach to the target molecule has also been explored. The antimicrobial studies on the synthesized benzoxazines have been investigated

Synthesis of 1-(2,4-dinitrophenyl)-3-aryl-4-(arylsulfanyl)-1<i>H</i>-pyrazoles by Vilsmeier reaction of 2,4-dinitrophenylhydrazones of phenacyl aryl sulfides

1611-1618Synthesis of a set of 1-(2,4-dinitrophenyl)-3-aryl-4-(arylsulfanyl)-1H-pyrazoles by Vilsmeier reaction of 2,4-dinitro­phenylhydrazones prepared from differently substituted phenacyl aryl sulfides is described

Synthesis of Isoquinoline Derivatives from β-Hydroxyarylethanamides

<div><p></p><p>A simple and efficient protocol for the construction of medicinally important substituted isoquinolines through intramolecular cyclization of β-hydroxyarylethanamides using acetic anhydride and phosphorous pentoxide in dioxane has been described. The chemo- and regioselectivities due to the influence of different catalysts were investigated and optimized for good to excellent yields. All the synthesized compounds have been characterized by NMR and mass spectral analyses.</p></div

Synthesis and antioxidant characteristic of novel thiazolidinone derivatives

377-383A series of novel thiazolidinone derivatives have been synthesized by solventless condensation of N-alkylamines with arylaldehydes at room temperature followed by a microwave assisted solventless addition of thioglycollic acid to the resultant imines. The synthesized compounds are characterized by 1H NMR, 13C NMR, MS and X-ray techniques and one of the synthesized thiazolidinones has been evaluated for its antioxidant property

Acetic anhydride induced rearrangement and Grignard addition on C-phenyl-N-(1-methyl-2-aryl)ethyl nitrones

646-653This article describes the acetic anhydride induced rearrangement of nitrone to amide and the addition of Grignard reagent to the nitrones yielding substituted hydroxylamines. It has been found that the conversion of C-phenyl-N-(1-methyl-2-aryl)ethyl nitrones 1 to N-(1-methyl-2-arylethyl)arylcarboxamides 2 is clean, selective and quantitative under solventless condition with microwave irradiation. The Grignard addition on nitrones 1 with phenylmagnesium bromide has been found to be very effective giving hydroxylamine derivatives quantitatively. All the synthesised compounds have been fully characterized by NMR and single crystal X ray analysis. </span

Mass spectral analysis and X-ray structure of diethyl 2-[aryl(4-aryl-1,2,3-selenadiazol-5-yl)methyl]malonate

758-761The mass spectra of diethyl 2-[aryl(4-aryl-1,2,3-selenadiazol-5-yl)methyl]malonate have been studied by electron impact method using high resolution mass spectrometry. The X-ray structure of a representative compound is also investigated

Synthesis and characterization of 5-(cyclohexylsulfanyl)- 4-aryl-1,2,3-selena/ thiadiazoles

305-309The synthesis and characterization of new 5-(cyclohexylsulfanyl)-4-aryl-1,2,3-selena/ thiadiazoles, obtained from the -sulfanyl semicarbazones are described. The structures of these compounds have been established by ¹H NMR, ¹³C NMR and single crystal X-ray diffraction