Isolation and Crystal Structure of 1′,4′-Trans-diol of Abscisic Acid

1 ′,4′-Trans-diol of abscisic acid was isolated from botrytis cinerea as a colorless crystal. The molecular and crystal structures have been determined by X-ray diffraction analysis. It crystallizes in orthorhombic system, space group P212121 with a = 6.724(3), b = 17.559(6), c =12.265(2) (A), a = β = y = 90°, V = 1448.1(8) (A)3, Z = 4, Dx = 1.222 g/cm3, F(000) = 576 and μ(MoKa) = 0.087 mm-1. The final R = 0.0628 and wR = 0.1604 for 2501 independent reflections with Rint = 0.0160 and 1679 observed reflections with I ＞2σ(Ⅰ). There are three intermolecular hydrogen bonds in a unit cell.     

Structure of Dimers and the Nature of Color in 4′-Nitro-4-dimethylaminoazobenzene Solutions

A mechanism is proposed for the formation of stable dimers of 4′-nitro-4-dimethylaminoazobenzene dye (4′-nitro-DAB)₂ in solution, the existence of which in a vapor phase was established in 1965. It is shown that (4′-nitro-DAB)₂ dimers are stable also in neutral and moderately acidic solutions. Their UV–Vis spectra are similar to the spectra of the same solutions of 4-dimethylaminoazobenzene (DAB) containing DAB₂ dimers as the ground state. Like DAB₂, (4′-nitro-DAB)₂ dimers are reversibly converted to di- and triprotonated dimers under conditions of low and moderate acidity. In the process, the yellow color of the initial solution changes to red. It is concluded that the great stability of the dimers in the liquid and vapor phases is due to their inter-monomer bonds being formed with the participation of electrons promoted from the sp²- orbitals of N-atoms in azo-groups N=N to the Rydberg 3s-orbitals of the N=N-group (Rydberg bonds). It is established that at high acidities, the triprotonated dimers (the red solution) decompose reversibly into diprotonated monomers (the yellow solution). Structural formulas are proposed for the protonated species.     

Synthesis and Crystal Structure of a 3-Arylamino-3-Deoxy Sugar Derivative

1INTRODUCTION Amino sugars in which a hydroxyl group of a mo-nosaccharide is replaced by an amino group play a wide variety of important biological roles[1]and have broad applications in chemical,biochemical,medi-cinal,and pharmaceutical fields[2,3].Amino sugars are chiral synthon of azasugar and polyose,many of which are found to be potential chemotherapeutic agents for the treatment of diseases,such as diabetes and cancer,inflammation and viral infections,inclu-ding HIV[4].Particularly…     

Synthesis and Crystal Structure of N,N′-4-aminomethyl-pyromellitic diimide

The title compound N,N′-4-aminomethyl-pyromellitic diimide (4-pmpmd) crystallizes in monoclinic, space group P21/c with a = 4.785(1), b = 6.200(1), c = 29.907(2) (A), β =93.583(11)°, V= 885.5(2) (A)3, Dc = 1.494 g/cm3, Z = 2, C22H14N4O4, Mr = 398.37,μ(MoKα) = 0.106mm-1 and F(000) = 412, and its structure was refined to R = 0.0469 and wR = 0.1017 for 1194observed reflections (Fo ＞ 4σ(Fo)). The X-ray diffraction shows the existence of the staggered multi-dimensional supramolecular network based on the Z-mode conformation of the title compound.     

Synthesis and Crystal Structure of N,N′-4-aminomethyl-pyromellitic diimide

1 INTRODUCTION N,N?-4-aminomethyl-pyromellitic diimide (4-pmpmdwas firstly obtained[1] in 1989 as one of the bypro-ducts by refluxing equimolar quantities of pyrome-llitic anhydride, n-hexylamine and 4-aminomethyl py-ridine in dry DMF to assemble electronic donor-spa-cer-acceptor systems, but its structure and coordina-tion chemistry did not receive attention at that time.For 4-pmpmd, the entity of two methylene groups(-CH2-) between the rigid pyromellitic diimide (PMDcore and two fre…     

Synthesis, Crystal Structure and Electrochemical Properties of a Novel Phenothiazine Derivative

A new compound 1,1‘-bis(3-pyridyl)-propylene(3,7-diformyl-N-ethylphenothiazinyl)ketone (C30H23N3O2S, Mr = 489.4) has been synthesized, and its crystal structure was determined by single-crystal X-ray diffraction method. The crystal is of orthorhombic, space group Ima2 with a = 27.491 (5), b = 11.942(2), c = 7.389(2) A, V = 2425.8(7) A^3, Z = 8, Dc =1.340 g/cm^3,μ = 0,167 mm ^1, F(000) = 1024, the final R = 0.0363 and wR = 0.0869 for 2054 unique reflections with Rint = 0.0254. The structural determination shows that the molecule assumes a butterfly configuration with nearly planar wings. In addition, the electrochemical study indicates that there is a high electronic delocalization in the molecule.     

Crystal and Molecular Structure of 4-Phenyl-cyclohexanone Semicarbazone

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Synthesis and Crystal Structure Analysis of 5′-O-Tosyl-2,3′-anhydrothymidine

In this paper=5′-O-tosyl-2,3′-anhydrothymidine has been synthesized and its crystal structure was analyzed. The crystal belongs to the triclinic system=space group P1=with a=5.397(2)=b=6.1886(18)=c=3.507(5) =α =87.74(2)=β =89.84(4)=γ =73.79(2)°=C17H18N2O6S=Mr=378.39=Z=1=V=432.8(3)3=Dc=1.452 g/cm3=F(000)=198 and Flack =-0.11(14). No intermolecular hydrogen bonds exist in the crystal=and the angle between benzene ring and pyrimidine planes is 32.23°.     

Synthesis and Crystal Structure of a β—Lactam Derivative of 2,4—Diary

１ＩＮＴＲＯＤＵＣＴＩＯＮ１,５ｂｅｎｚｏｔｈｉａｚｅｐｉｎｅｓｐｏｓｅｓｐｏｔｅｎｔｉａｌｂｉｏｌｏｇｉｃａｌａｃｔｉｖｉｔｉｅｓ〔１〕．ＣｙｃｌｏａｄｄｉｔｉｏｎｒｅａｃｔｉｏｎｓａｔｔｈｅｉｒＣ＝Ｎｄｏｕｂｌｅｂｏｎｄｈａｖｅａｒｏｕｓｅｄｃ...     

Synthesis and Crystal Structure of the Derivative of β-elemene C_(20)H_(33)N·Cl_3CCOOH

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Analytical Properties of 4, 4′-Biazobenzenediazoaminobenzene and its Applications in Spectrophotometry

Abstract

The spectral characteristics and analytical properties of 4, 4′-Biazobenzenediazoaminobenzene as a new chromogenic reagent have been described and the optimum conditions for reaction with eight metal ions are presented. In the presence of Triton X-100 and sodium tetraborate solution, the reagent can be used for the determination of Hg, Ni, Cd. The molar absorptivities are 1.8×10⁵ l.mol^?1. cm^?1 at 515 nm for mercury, 2.0×10⁵ l.mol^?1. cm^?1 at 540 nm for nickel, and 1.8×10⁵ l.mol^?1.cm^?1 at 526 nm for cadmium. The recommended procedure has been used for the spectrophotometric determination of cadmium in waste water.     

Synthesis and Crystal Structure of a β-Lactam Derivative of 2,4-Diaryl-1,5-Benzothiazepine

１ＩＮＴＲＯＤＵＣＴＩＯＮ１,５ ｂｅｎｚｏｔｈｉａｚｅｐｉｎｅｓｐｏｓｅｓｐｏｔｅｎｔｉａｌｂｉｏｌｏｇｉｃａｌａｃｔｉｖｉｔｉｅｓ〔１〕．ＣｙｃｌｏａｄｄｉｔｉｏｎｒｅａｃｔｉｏｎｓａｔｔｈｅｉｒＣ＝Ｎｄｏｕｂｌｅｂｏｎｄｈａｖｅａｒｏｕｓｅｄｃ...     

Synthesis and Crystal Structure of 4,4′-Diamino-N,N′-diethyl Bisbenzenesulfamide

A new compound of 4,4′-diamino-N,N′-diethyl bisbenzenesulfamide (C18H26N4O4S2, Fw = 426.55) has been synthesized and its structure was determined by X-ray crystallography method. The crystal belongs to the monoclinic system, space group P21/c with a = 10.0623(9), b = 13.6759(13), c =15.5309(14) , β = 100.482(2)o, V = 2101.6(3) 3, Dc = 1.348 g/cm3, F(000) = 904, μ = 0.285 mm–1, Z = 4, the final R = 0.0512 and wR = 0.1363 for 3485 observed reflections with I > 2σ(I). The structure of the title compound is pseudo secondary axisymmetric, and the two sulfamide-groups show distorted tetrahedral configurations.     

Synthesis and Crystal Structure of the Derivative of β-elemene C20H33N·Cl3CCOOH

The structure of the piperidine derivative of β-elemene C 20H33N·Cl3CCO OH was determined by X-ray crystallography. The crystal belongs to the orthorh ombic system, space group P212121, a=12.303(4), b=22.064(7), c=9.002(4)(A), V=2444(2)(A)3, Z=4, Mr =450.88, Dc=1.23g/cm3, μ(MoKα)=3.91cm-1, F(000)=960, Final R=0.050, Rw=0.067 fo r 2393 reflections [I>3σ(I)], GOF=1.91. The title compound is composed of trichl oroacetate and the elemenyl piperidine cation. The latter contains two hexacycli c rings of β-elemene and piperidine, which adopt the chair conformations.     

Synthesis and Crystal Structure of Triethyl 1,2,2-triphenylpyrrolidine-3,4,5-tricarboxylate,A Proline Derivative

１ＩＮＴＲＯＤＵＣＴＩＯＮＩｎｒｅｃｅｎｔｙｅａｒｓ，ｏｕｒｒｅｓｅａｒｃｈｇｒｏｕｐｈａｓｓｔｕｄｉｅｄｓｙｓｔｅｍａｔｉｃａｌｙｃｙｃｌｏａｄｄｉｔｉｏｎｒｅａｃ ｔｉｏｎｓｏｆｔｈｅＣ＝Ｎｄｏｕｂｌｅｂｏｎｄｓｉｎｔｈｅｂｅｎｚｏｈｅｔｅｒｏａ...     

Synthesis under Micromave Irradition and Crystal Structure of 4′-Acetylbenzo-15-crown-5thiosemicarbazone

The title compound is a bifunctional receptors including a thiourea group and a crown ether ring. Due to many possible potentials as a new class of reagents for membrane transports, ion-selective electrodes as well as reaction catalysts, the design and synthesis of bifunctional receptors for simultaneous binding of cations and anions is of ongoning interest in srpramolecular chemistry1-5. In bifunctional receptors, the binding sites for anions and cations are covalently linked so as to exhibit…