• 통합자연과학논문집
• /
• 제8권4호
• /
• pp.250-257
• /
• 2015

The crystal structure of the potential active 3-(4-ethylphenyl)-3H-chromeno[4,3-c]isoxazole-3a(4H)-carbonitrile ($C_{19}H_{16}N_2O_2$) has been determined from single crystal X-ray diffraction data. In the title compound crystallizes in the monoclinic space group $P2_1/c$ with unit cell dimension a=6.6869 (8) ${\AA}$, b=15.8326 (19) ${\AA}$ and c= 15.237 (2) ${\AA}$ [${\alpha}=90^{\circ}$, ${\beta}=100.663^{\circ}$ and ${\gamma}=90^{\circ}$]. In the structure chromene, isoxazole and carboxylate are almost coplanar each other. All geometrical parameters revelled that chromene ring of pyran ring adopt sofa conformation. The crystal packing is stabilized by intermolecular C-H...N and C-H...O hydrogen bond interaction.

• 통합자연과학논문집
• /
• 제8권3호
• /
• pp.184-191
• /
• 2015

The crystal structure of the potential active methyl-3-phenyl-3H-chromeno[4,3-c]isoxazole-3a(4H)-carboxylate ($C_{18}H_{15}NO_4$) has been determined from single crystal X-ray diffraction data. In the title compound crystallizes in the orthorombic space group $P2_12_12_1$ with unit cell dimension $a=9.8320(17){\AA}$, $b=9.9890(18){\AA}$ and $c=15.588(3){\AA}$ [${\alpha}=90^{\circ}$, ${\beta}=90^{\circ}$ and ${\gamma}=90^{\circ}$]. In the structure chromene, isoxazole and carboxylate are almost coplanar each other. All geometrical parameters revelled that chromene ring of pyran ring adopt sofa conformation. The crystal packing is stabilized by intermolecular C-H...O and C-H...N hydrogen bond interaction.

• Bulletin of the Korean Chemical Society
• /
• 제31권9호
• /
• pp.2633-2636
• /
• 2010

3-Acetyl-5-benzoyl-6-methyl-2-phenyl-4H-pyran-4-one has been subjected to condensation with a series of primary amines (ethylamine - octylamine) to clarify the proposed mechanism in our previous study. The reactions of the shorter amines of the series (ethylamine - butylamine) yielded unsymmetric pyridinone products, whereas the other amines (pentylamine - octylamine) yielded symmetrical pyridinones. The starting material and the products as well as the intermediates have been subjected to theoretical analysis by quantum chemical calculations at B3LYP/6-31G(d,p) level, which provided supporting data for the experimental findings.

• 대한화학회지
• /
• 제58권1호
• /
• pp.44-48
• /
• 2014

Catalytic performance of Lewis acids have been investigated in the synthesis of 1,2,3,4-tetrahydroquinolines via cyclocondensation reaction of aniline derivatives with cyclic enol ethers such as 3,4-dihydro-2H-pyran and 2,3-dihydrofuran. The catalytic activity of various of these catalysts in different solvents was compared with other classical catalysts such as KSF clay (1.5 g), $InCl_3$ (10-20 mol%), $ZrOCl_2$ (10 mol%), $Sc(OTf)_3$ (3 mol%), PANI-$InCl_3$ (10 mol%), $I_2$ (20 mol%), $InCl_3$ (5 mol%), 4-npa (25 mol%) and Cellulose-$SO_3H$ (0.03 g).

• Bulletin of the Korean Chemical Society
• /
• 제30권6호
• /
• pp.1407-1409
• /
• 2009

• Bulletin of the Korean Chemical Society
• /
• 제31권10호
• /
• pp.2884-2888
• /
• 2010

Two red fluorescent DCJTB derivatives (Red 1 and 2) based on modified pyrans were synthesized and their electroluminescent properties were investigated. Multilayered OLEDs were fabricated with the device structure of ITO/NPB (40 nm)/Red 1, 2 or DCJTB (0.5 or 1%): $Alq_3$ (20 nm)/$Alq_3$ (40 nm)/Liq (2 nm)/Al. All devices exhibited efficient red emissions. In particular, a device containing emitter Red 2 as a dopant in the emitting layer, the maximum luminance was $8737\;cd/m^2$ at 12.0 V, the luminous and power efficiencies were 2.31 cd/A and 1.25 lm/W at $20\;mA/cm^2$, respectively. The peak wavelength of the electroluminescence was 638 nm with the CIE (x,y) coordinates of (0.63, 0.36) at 7.0 V.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2003년도 추계학술대회 논문집 Vol.16
• /
• pp.486-489
• /
• 2003

Red organic electroluminescent(EL) devices based on poly(N-vinylcarbazole)(PVK) and tris(8-hydroxyquinorine aluminum)($Alq_3$) doped with red emissive material, 4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl)4H-pyran(DCJTB), poly(3-hexylthiophene)(P3HT), Rubrene and 4-dicyanomethylene-2-methyl-6[2-(2,3,6,7-tetrahydro-1H,5H-benzo-[i.j])quinolizin-8yl)vinyl-4H-pyran(DCM2) were fabricated. We examine the energy transfer from $Alq_3$ to DCJTB, P3HT, Rubrene and DCM2 by comparing between the PL and EL spectrum. The maximum peak PL intensities were achieved when the doping concentration of DCJTB, DCM2, P3HT and Rubrene has 5, 1, 0.5, 2wt%, respectively. The maximum luminance of device using DCJTB showed $594\;cd/m^2$ at 15V.

• Bulletin of the Korean Chemical Society
• /
• 제7권2호
• /
• pp.148-150
• /
• 1986

A potential carbapenem template, 4-(2-methoxyethyl)-2-azetidinone (3), was prepared in seven steps from 5,6-dihydro-2H-pyran-2-one (5).

• Bulletin of the Korean Chemical Society
• /
• 제22권8호
• /
• pp.791-792
• /
• 2001

• Bulletin of the Korean Chemical Society
• /
• 제22권11호
• /
• pp.1179-1180
• /
• 2001