Microwave-assisted Synthesis and Crystal Structure of 3-Acetamido-1-phenyl-4-（2,6-dichloro）benzylidene-5-pyrazolone

The title compound,3-acetamido-1-phenyl-4-(2,6-dichloro)benzylidene-5-pyrazolone(C18H13Cl2N3O2,Mr = 374.21),has been synthesized by one-step condensation of 2,6-dichloroben-zaldehyde with acetic anhydride and 3-amino-1-phenyl-5-pyrazolone under microwave irradiation.The compound was characterized by means of IR and 1H NMR.Its crystal and molecular structure were determined by X-ray diffractometry.It belongs to the orthorhombic system,space group Pbca,with a = 12.5312(13),b = 8.5495(9),c = 31.110(3) ,V = 3332.9(6) 3,Z = 8,Dc = 1.492 g/cm3,λ = 0.71073 ,μ(MoKα) = 0.407 mm-1,F(000) = 1536,the final R = 0.0394 and wR = 0.0984.A total of 15894 reflections were collected,of which 3630 were independent(Rint = 0.0362).There exist three planes in the molecular structure.X-ray analysis reveals that the dihedral angles between planes 1 and 2,1 and 3 and 3 and 2 are 80.89,74.29 and 20.57°,respectively.     

Synthesis,Crystal Structure and Biological Activity of N-（2,6-Difluorobenzoyl）-N＇-[5-（4-trifluoromethyl-phenyl）-1,3,4-thiadiazol-2-yl]ure

The title compound N-(2,6-difluorobenzoyl)-N'-[5-(4-trifluoromethylphenyl)-1,3,4-thiadiazol-2-yl]urea(C17H9F5N4O2S,Mr = 428.34) has been synthesized by the reaction of 2-amino-5-(4-trifluoromethylphenyl)-1,3,4-thiadiazole with 2,6-difluorobenzoyl isocyanate,and its crystal structure was determined by single-crystal X-ray diffraction.The crystal belongs to monoclinic,space group P21/n with a = 10.7316(13),b = 10.5617(13),c = 16.037(2) ,β = 106.408(2)°,V = 1743.6(4) 3,Z = 4,Dc = 1.632 g/cm3,μ = 0.260 mm-1,F(000) = 864,the final R = 0.0599 and wR = 0.1420 for 3467 observed reflections with I > 2σ(I).The urea group,which adopts a planar configuration mediated by the intramolecular N-H...O hydrogen bond,is nearly coplanar with the thiadiazole and 4-trifluoromethylbenzene rings.The title compound was found to exhibit good fungicidal activity against Rhizoctonia solani and Botrytis cinerea.     

Synthesis,Crystal Structure and Characterization of a New Tetra-nuclear Lead Complex:[Pb_4(1,2-bdc)_4(L)_2]·2.25H_2O

The title complex,[Pb4(1,2-bdc)4(L)2]·2.25H2O 1(L = 2-(2-chloro-6-fluorophen-yl)-1H-imidazo[4,5-f][1,10]phenanthroline,1,2-H2bdc = 1,2-benzenedicarboxylic acid),has been obtained by using hydrothermal synthesis and characterized by elemental analysis,IR and single-crystal X-ray diffraction.It crystallizes in monoclinic,space group P21/c with a = 12.0920(6),b = 18.9248(10),c = 15.2729(8) ,β = 98.7530(10)°,V = 3454.3(3) 3,Z = 1,C140H90Cl4F4N16O41Pb8,Mr = 4527.60,Dc = 2.176 g/cm3,F(000) = 2130,μ(MoKa) = 9.884 mm-1,R = 0.0241 and wR = 0.0582.Compound 1 exhibits a unique tetra-nuclear structure,and is further stacked by π-π interactions to give a two-dimensional supramolecular layer.The N-H···O and O-H···O hydrogen bonds stabilize the structure of 1.     

A New Supramolecular Compound Based on Cd（II）-Schiff-base and Keggin-type [PMo_（12）O_（40）]~3

A new supramolecular compound, {[Cd(L)2]2[PMo12O40NO3]·CH3CN·2H2O}n 1 (L is 1,4-bis(4-imidazolyl)-2,3-diaza-1,3-butadiene), based on Cd(II)-Schiff-base and Keggin- type [PMo12O40]3- was synthesized via self-assembly and structurally characterized by elemental analysis, infrared spectroscopy, and single-crystal X-ray diffraction analysis. The crystal is of triclinic, space group P1 with a = 12.0128(11), b = 13.6196(13), c = 13.9995(13) , α = 103.868(2), β = 95.225(2), γ = 101.024(2)°, V = 2160.0(3) 3, Z = 1, C34H39N26O45Cd2Mo12P, Mr = 2938.96, Dc = 2.259 g/cm3, μ = 2.276 mm-1, F(000) = 1400, the final R = 0.0565 and wR = 0.1613 for 4973 observed reflections with I 2σ(I). The crystal structure can be described by the packing of Keggin anionic and Metal-Schiff-base cationic layers.     

Synthesis,Structure and Spectral Properties of a Novel Triaryl Substituted Triazole and Its Co(Ⅱ) Complex

The new compound 3-(2-pyridyl)-4-(p-methoxyphenyl)-5-(2-thienyl)-1,2,4-triazole L was synthesized and characterized by elemental analysis,IR,1H NMR,13C NMR,MS,UV and photoluminescent spectra.The complex CoL2(NCS)2 was prepared by the reaction of ligand L with Co(SCN)2,and its structure was characterized by single-crystal X-ray diffraction,IR,UV,elemental analysis and MS.The complex crystallizes in monoclinic,space group P21/n with a=13.7639(19),b=7.6641(11),c=18.409(3),β=101.549(3)o,V = 1902.6(5) 3,Z=2,C38H28CoN10O2S4,Mr=843.87,Dc=1.473 g/cm3,μ=0.720 mm-1,S=1.075,F(000)=866.0,the final R=0.0825 and wR=0.2149 for 2566 observed reflections(I2σ(I)).In the crystal structure,the cobalt atom adopts a distorted octahedral environment with two NCS-ions in the axial positions and two bidentate chelating L ligands in the equatorial plane.The extended 2D network of the complex is formed by intermolecular C-H…N hydrogen bonds together with π-π stacking interactions.     

Synthesis,Crystal Structure and Characterization of a New Mixed-valence Cu（Ⅰ）/Cu（Ⅱ） Complex [Cu（bipy）（Me2dtc）CuI2]n

A new one-dimensional mixed-valence Cu(Ⅰ)/Cu(Ⅱ) complex [Cu(bipy)(Me2dtc)CuI2]n 1 (bipy = 2,2′-bipyridine and Me2dtc = N,N-dimethyldithiocarbamate) has been synthesized under solution condition, and characterized by elemental analysis, IR spectrum, single-crystal X-ray diffraction and magnetic property. The crystal belongs to the tetragonal system, space group P4122 with a = b = 11.6504(16), c = 13.466(3) , V = 1827.8(5) 3, Z = 4, Dc = 2.389 g/cm3, Mr = 657.27, λ(MoKa) = 0.71073 , μ = 5.931 mm·1, F(000) = 1236, the final R = 0.0483 and wR = 0.1245. A total of 2102 unique reflections were collected, of which 2009 with I > 2σ(I) were observed. 1 consists of polymeric [CuII2]nnanions and [CuII(bipy)(Me2dtc)]+ cations. It is interesting that the cations of 1 interact through π-π stacking interactions after rotating 90° to form one-dimensional chains parallel to the anion chains. The magnetic study indicates antiferromagnetic behavior for this complex.     

Solvothermal Synthesis and Crystal Structure of a 1D Helical-chain Cobalt（II） Complex Containing （Quinolin-8-yloxy）acetate

The cobalt(II) complex with (quinolin-8-yloxy)acetate, [CoCl(C11H8NO3)]n (1), has been prepared via the solvothermal method and characterized by IR, elemental analysis, UV- Vis diffuse-reflection spectra and single-crystal X-ray diffraction analysis. Complex 1 is a novel carboxylate-bridged one-dimensional helical cobalt(II) polymer, and the Co(II) centre exhibits an approximately square pyramidal CoClNO3 coordination geometry. It crystallizes in monoclinic, space group P21/n, with a = 9.1594(10), b = 6.8864(7), c = 17.290(2) , β = 102.629(3)o, C11H8ClCoNO3, Mr = 296.56, V = 1064.2(2) 3, Z = 4, Dc = 1.851 g/cm3, F(000) = 596, μ = 1.856 mm-1, the final R = 0.0308 and wR = 0.0807. Interestingly, the chain complexes are assembled to form two-dimensional networks through intermolecular face-to-face π-π stacking interactions with the centroid-to-centroid distance of 3.559(1)  and the dihedral angle of 8.4(1)° between the aromatic rings.     

Synthesis and Structure of a Ruthenium（Ⅱ）-dithiocarbamate Complex [RuH（CO）（PPh_3）_2（4-ClPhNHCS_2）]·C_6H_（14）

The title complex [RuH(CO)(PPh3)2(4-ClPhNHCS2)]·C6H14 has been prepared and characterized by X-ray diffraction analysis.It crystallizes in the triclinic system,space group P1 with a = 11.0817(2),b = 14.3889(2),c = 15.2136(2) ,α = 71.018(1),β = 74.911(1),γ = 85.146(1)°,V = 2214.86(6) 3,Z = 2,Mr = 900.4,Dc = 1.350 g/cm3,Mr = 900.40,μ(MoKα) = 0.616 mm-1,F(000) = 926,S = 1.016,the final R = 0.0478 and wR = 0.0947 for 6828 observed reflections with I > 2σ(I) and 505 variables.The molecular structure of 1 consists of one neutral complex [RuH(CO)(PPh3)2(4-ClPhNHCS2)] and one hexane solvent molecule.The geometry around ruthenium is pseudo-octahedral with two trans-binding PPh3 ligands and one chelating bidentate 4-ClPhNHCS2- ligand via two sulfur atoms.The average Ru-S,Ru-P and Ru-H bond lengths are 2.4824(8),2.3495(8) and 1.71(2),respectively.The electrochemical properties of 1 have been studied in CH2Cl2 solution by cyclic voltammetry.     

Synthesis and Characterization of a Sb(Ⅲ)Complex with α-Diimine Ligand and a Csp3-Csp3 Coupling Production of the Original Ligand

A Csp3-Csp3 coupling production of the original ligand molecule [(CMeN(2,6-iPr2C6H3))2]2 (1) and an antimony ionic compound with α-diimine ligand [LH3]+[SbCl4]-(2, L = [(2,6-iPrC6H3)NC(Me)]2) were synthesized and characterized by 1H NMR, elemental analysis and single-crystal X-ray structural analysis. The crystal of compound 1 belongs to the orthorhombic system, space group Pbca with a = 21.173(4), b = 10.1639(17), c = 22.954(4) , V = 4939.8(14) 3, C56H78N4, Mr = 807.22, Z = 4, Dc = 1.085 g/cm3, μ(MoKα) = 0.062 mm-1, F(000) = 1768, S = 0.998, the final R = 0.0593 and wR = 0.1616 for 6481 observed reflections (Ⅰ > 2σ(Ⅰ)) and R = 0.0819 and wR = 0.1805 for all 28753 data. The crystal of compound 2 belongs to the triclinic system, space group P with a = 10.930(2), b = 12.553(2), c = 12.561(3) , α = 89.780(7), β = 82.861(6), γ = 68.598(4)o, V = 1590.5(5) 3, C28H43Cl4N2Sb, Mr = 671.19, Z = 2, Dc = 1.401 g/cm3, μ(MoKα) = 1.222mm-1, F(000) = 688, S = 0.989, the final R = 0.0294 and wR = 0.0616 for 7578 observed reflections (Ⅰ > 2σ(Ⅰ)) and R = 0.0366 and wR = 0.0639 for all 16515 data. Complex 1 can be rationalized as a result of Csp3-Csp3 coupling of two ligand molecules. The reaction of corres- ponding potassium salts with Sb(Ⅲ) chloride resulted in the antimony complex 2, in which the cationic moiety [LH3]+ is balanced by the presence of [SbCl4]- anion.     

Synthesis and Crystal Structure of 2-Hydroxybenzoic Acid [1-（3,5-Dibromo-2-hydroxyphenyl）methylidene]hydrazide Methanol

A new Schiff base compound, 2-hydroxybenzoic acid [1-(3,5-dibromo-2-hydroxy- phenyl) methylidene]hydrazide methanol (C14H10Br2N2O3·CH3OH), has been synthesized by the condensation of equimolar 3,5-dibromosalicylaldehyde and 2-hydroxybenzoic acid hydrazide in a methanol solution. The compound was characterized by elemental analysis, IR spectra, and single- crystal X-ray diffraction. The compound consists of a Schiff base moiety 2-hydroxybenzoic acid [1-(3,5-dibromo-2-hydroxyphenyl)methylidene]hydrazide and a lattice methanol molecule. The crystal belongs to the monoclinic system, space group P21/n with a = 7.183(1), b = 15.673(2), c = 15.001(2) , β = 98.345(2)o, Z = 4, V = 1670.9(4) 3, Dc = 1.773 g/cm3, Mr = 446.10, λ(MoKα) = 0.71073 , μ = 4.872 mm-1, F(000) = 880, R = 0.0458 and wR = 0.0963. A total of 3445 unique reflections were collected, of which 2236 with I > 2σ(I) were observed. As expected, the molecule adopts a trans configuration about the C=N double bond. The two benzene rings are nearly coplanar (mean deviation from the combined plane is 0.061(4) ), with the dihedral angle of 7.9(3)o. The preliminary biological tests show that the compound has moderate antibacterial activities.     

Synthesis and Crystal Structure of 4-（4-Bromophenyl）- 3,4-dihydro-6-methyl quinolin-2（1H）-one

The title compound (C16H14BrNO) has been synthesized by the reaction of p-tolylamine, Meldrum’s acid and 4-bromo-benzaldehyde, and its structure was characterized by IR, 1H NMR and X-ray single-crystal diffraction. The crystal belongs to monoclinic, space group P21/n with a = 7.6850(11), b = 8.3004(11), c = 21.301(3) , β = 95.110(2)°, V = 1353.4(3) 3, Mr = 316.19, Z = 4, Dc = 1.552 g/cm3, μ(MoKα) = 3.028 mm-1, F(000) = 640, the final R = 0.0345 and wR = 0.0768. X-ray analysis reveals that the atoms of C(1), C(2), C(3), C(4), C(5) and N(1) form a six-membered ring of boat conformation.     

Synthesis and Crystal Structure of a Dinuclear Complex： Bis[aqua（phen）（4- aba）copper（Ⅱ）nitrate（4-abaH）dihydrate]

The title complex has been obtained by the reaction of copper nitrate tri-hydrate with 4-abaH (4-abaH=4-aminobenzonic acid) and phenanthroline in ethanol solution,and its structure was determined by X-ray crystallography with the following data: monoclinic,space group C2/c,Mr=1266.13,Cu2C52H54N10O20,a=25.884(5),b=10.205(2),c=20.849(4) ,β=106.34(3)°,Z=4,V=5284.7(18) 3,F(000)=2616,Dc=1.591 g/cm3,μ=0.896 mm-1,the final R=0.0441 and wR=0.1148 for 4200 observed reflections (I > 2σ(I)). In the molecule of the title complex,the asymmetric unit contains one half molecule. The Cu(Ⅱ) atom is five-coordinated by a terminal water molecule,a bidentate phenanthroline and two monodentate 4-aminobenzoate ligands forming a square pyramidal coordination environment. The two bridging 4-aminobenzoate ligands result in a dinuclear copper(Ⅱ) cluster with a short Cu–Cu distance (3.048 ) and a π-π stacking between the adjacent phenanthroline rings (2.96 ).     

Synthesis and Crystal Structure of a New Complex Zn(Ⅱ)L_2·2CH_3OH(H_2L = 4-Chloro-2-(2,3-dihydro-1H-benzoimidazol-2-yl)-phenol)

A new complex Zn(Ⅱ)L2·2CH3OH(H2L = 4-chloro-2-(2,3-dihydro-1H-ben-zoimi-dazol-2-yl)-phenol) has been prepared and characterized by single-crystal X-ray diffraction analysis and elemental analysis.The crystal is of triclinic system,space group P1 with a = 9.2905(10),b = 10.3555(13),c = 14.9590(14) ,α = 101.0340(10),β = 101.261(2),γ = 99.1660(10)o,V = 1356.1(3) 3,Z = 2,C28H24Cl2N4O4Zn,Mr = 616.78,Dc = 1.510 g/cm3,μ = 1.145 mm·1,F(000) = 632,the final R = 0.0379 and wR = 0.0830 for 3606 observed reflections with I 2σ(I).The Zn(Ⅱ) atom presents a distorted square pyramidal coordination involving two H2L ligands.The hydrogen bonds and π···π stacking interactions extend the complex into a two-dimensional framework.     

Synthesis and Crystal Structure of 2,6-Bis（2-pyridinylmethyl）-3,5-bis（2-hydroxyl-5-chlorophenyl）pyrazine

The title compound,2,6-bis(2-pyridinylmethyl)-3,5-bis(2-hydroxyl-5-chlorophe nyl)-pyrazine(C26H12Cl2N4O2C2H8O2,Mr=551.41),has been synthesized and characterized by LC-ESIMS,NMR,UV and IR spectroscopy as well as by X-ray single-crystal diffraction.The compound behaves as a substituted pyrazine.The hydrogen atoms on C(2) and C(3) are substituted by 2-pyridinyl,whereas those on C(1) and C(4) are substituted by 2-hydroxyl-5-chlorophenyl.It crystallizes in the monoclinic system,space group P21/c with a=8.9433(12),b=32.003(4),c=10.5209(18),β=111.199(2)°,V=2807.5(7)3,Z=4,Dc=1.305 mg/m3,F(000)=1144 and μ=0.094 mm-1.A total of 13235 reflections were collected in the range of 2.17～25.01o by using a phi and omega scan mode,of which 4923 were unique(Rint=0.0692) and 2872 observed reflections with Ⅰ > 2σ(Ⅰ) were used in the structure solution and refinement.     

Syntheses,Crystal Structures and Properties of Three New Complexes [Ni（C9N2O2H7）2（CH3OH）2],[Zn（C9N2O2H7）2（H2O）2] and [Cd（C9N2O2H7）2（CH3OH）2]

Three novel metal-organic complexes with formulas [Ni(C9N2O2H7)2(CH3OH)2](1),[Zn(C9N2O2H7)2(H2O)2](2) and [Cd(C9N2O2H7)2(CH3OH)2](3) were synthesized by the reactions of Ni,Zn and Cd salts with ethyl 2-benzimidazolylacetate under hydrothermal conditions or layering technique,and characterized by single-crystal X-ray diffraction analysis,IR spec-troscopy,solid-state luminescent properties and thermogravimetric(TG) analysis.The crystal data for these three complexes are as follows:for 1,monoclinic,space group P21/c,a = 9.384(3),b = 9.634(3),c = 11.292(3) ,β = 95.787(5)°,V = 1015.7(5) 3,Z = 2,F(000) = 492,Dc = 1.547 Kg/m3,μ = 1.002 mm-1,the final R = 0.0451 and wR = 0.0900 for 1833 observed reflections with Ⅰ 2σ(Ⅰ);for 2,orthorhombic,space group Pbca,a = 10.031(4),b = 10.379(4),c = 17.525(7),V = 1824.6(12) 3,Z = 4,F(000) = 928,Dc = 1.645 Kg/m3,μ = 1.392 mm-1,the final R = 0.0452 and wR = 0.0996 for 1661 observed reflections with Ⅰ 2σ(Ⅰ);for 3,monoclinic,space group P21/c,a = 9.9114(13),b =10.4852(15),c = 10.4120(14) ,β = 108.453(5)°,V = 1026.4(2) 3,Z = 2,F(000) = 532,Dc = 1.705 Kg/m3,μ = 1.110 mm-1,the final R = 0.0322 and wR = 0.0805 for 1822 observed reflections with Ⅰ 2σ(Ⅰ).In the three complexes,the ethyl 2-benzimidazolylacetate shows the same chelating mode,and the adjacent units are interlinked into a two-dimensional layer through hydrogen-bonds(O-H···O,N-H···O).     

Synthesis and Crystal Structure of 4-（2-Methylene-1-ethyl-3,3-dimethylindoline-2＇-yl）-6,8-dibromo-1＇-ethyl-3＇,3＇-dimethylspiro-[3,4-dihydro-2H-1-benzopyran-2,2＇-indoline]

The title compound of 4-(2-methylene-1-ethyl-3,3-dimethylindoline-2'-yl)-6,8-dibro-mo-1'-ethyl-3',3'-dimethylspiro[3,4-dihydro-2H-1-benzopyran-2,2'-indoline],C33H36Br2N2O,as a dicondensed spiropyran(DC) has been synthesized by indoline in ethanol with 3,5-dibromo-salicyaldehyde.The compound was characterized by elemental analysis and IR spectra.Meanwhile,the crystal of the compound was obtained and determined by X-ray single-crystal diffraction.Crystal data:monoclinic system,space group P21/n,a=12.9699(15),b=12.5196(13),c=19.327(2),β=106.493(3)°,Mr=636.46,V=3009.1(6) 3,Z=4,F(000)=1304,Dc=1.405 g/cm3,μ=2.722 mm-1,R=0.0554 and wR=0.1176 for 6892 independent reflections(Rint=0.0354) and 5699 observed reflections(Ⅰ 2σ(Ⅰ)).     

Synthesis and Crystal Structure of（2E,6E）-2,6-bis（2,3-dimethoxybenzylidene）cyclohexanone

The new title compound (2E,6E)-2,6-bis(2,3-dimethoxybenzylidene)cyclohexanone (C 24 H 26 O 5,M r=394.45) has been synthesized,and its crystal structure was studied.The title compound crystallizes in the orthorhombic system,space group Pca2 1 with a=17.536(2),b=14.8515(16),c=8.0512(9),V=2096.8(4) 3,Z=4,D c=1.250 g/cm 3,λ=0.71073,μ=0.087 mm-1 and F(000)=840.The structure was solved by direct methods and refined to R=0.0533 and wR=0.1248 from 2727 observed reflections (I > 2σ(Ⅰ)).The title molecules are connected through hydrogen bonds to generate a 3-D supramolecule.The preliminary biological tests showed definitely biological activity for the title compound.     

Synthesis and Crystal Structure of 9-[3-Oxo-1-（4-bromopheny）-3-phenypropyl] fluorine

A novel compound of 9-[3-oxo-1-(4-bromopheny)-3-phenypropyl]fluorine (3) was synthesized via nucleophilic addition reaction under solvent-free condition. Its structure was determined by IR, 1H NMR, MS, elemental analysis and X-ray diffraction. The crystal of the new compound is of triclinic system, space group P-1 with a=9.7919(16), b=11.0932(18), c=11.2534(19) , α=76.927(3), β=67.452(3), γ=84.895(3)°, V=1099.7(3) 3, Z=2, Dc=1.369 g/cm3, μ=1.886 mm-1, F(000)=464, R=0.0586 and wR=0.1562 for 3145 observed reflections with Ⅰ 2σ(Ⅰ). π-π Stacking interactions contribute to the stability of the structure.     

Synthesis and Crystal Structure of a Novel 1D Mercury（II） Iodide Coordination Polymer Containing 40-Membered Macrocycle

A mercury coordination polymer [Hg3(TizT)2I6]n (Mr = 1921.72, TizT = 2,4,6- tri(imidazole-1-yl)-1,3,5-triazine) containing a 40-membered macrocycle which was constructed by four TizT ligands and four mercury(II) iodide molecules had been synthesized by the reaction of HgI2 with TizT. The complex was characterized by elemental analysis, FT-IR, 1H NMR spectra and X-ray crystallography. The crystal of the complex belongs to the monoclinic system and C2/c space group with a = 35.840(5), b = 8.169(5), c = 14.980(5) , β = 104.466(5)°, Z = 4, V = 4247(3) 3, Dc = 3.006 g·cm-3, μ = 15.223 mm-1, F(000) = 3384, Rint = 0.0504, wR = 0.0833 and constructs a chair-like conformation of cyclohexane one by one, which forms a 1-D polymer through the fashion of fused ring aromatic hydrocarbon. The hydrogen bonds and π-π interactions shape the 2-D network structure. The two compounds excited weak fluorescence.     

Synthesis and Crystal Structure of N-[（2S）-4-bromo-2-（L-menthyloxy）-5-oxo-2,5-dihydro-3-furyl]-L-leucine

Starting from(5S)-(L-menthyloxy)-3,4-dibromo-5H-furan-2-one and L-leucine,the title compound N-[(2S)-4-bromo-2-(L-menthyloxy)-5-oxo-2,5-dihydro-3-furyl]-L-leucine 5(C20H32BrNO5,Mr = 446.37) was obtained in one-pot process via the tandem Michael addition-elimination reaction in the presence of potassium hydroxide.The chemical structure and absolute configuration of the title compound were confirmed via rotation,UV-Vis,FT-IR,1H NMR,13C NMR,MS and elemental analysis,especially by the X-ray single-crystal diffraction.The crystal crystallizes in an orthorhombic system,space group P212121 with a = 12.5249(16),b = 19.005(3),c = 19.719(3) ,V = 4693.7(10) 3,Z = 8,Dc = 1.263 g/m3,μ = 1.778 mm-1,F(000) = 1872,the final R = 0.0617 and wR = 0.1576 for 3967 observed reflections(I > 2σ(I)).X-ray analysis reveals that the title compound has two independent molecules in the asymmetric part of the unit cell with the two five-membered furanones being almost planar.The essential part of the electron delocalization is concentrated in the N(1),C(3),C(1),C(37) and O(7) region and N(2),C(28),C(27),C(30) and O(4) region in the other molecule respectively,but does not take place at the expense of delocalization within the ester function.