Structure determination of tolbutamide

N-​[(Butylamino)​carbonyl]​-​4-​methylbenzenesulfonamide, is an antidiabetic drug which crystd. in orthorhombic space group Pn21a, with a 20.16(2)​, b 9.05(1)​, c 7.85(1) Å; Z = 4, d.(exptl.) = 1.24 and d.(calcd.) = 1.25 for Z = 4. The structure was solved by the Patterson search method and refined to R = 0.083 for 615 visually measured reflections. At. parameters are given. The structure is stabilized by H bonding between the polar ground and van der Waals interactions between the nonpolar groups. Of the three H bonds, two are weakly as they are bifurcated

The structure of 2-​piperidinotricyclo[5.2.2.02.6]​undecan-​9-​on

The title compd. is monoclinic, space group Cc, with a 24.28(4)​, b 8.76(6)​, c 14.03(2) Å, and β 108.00(9)​°; d.(exptl.) = 1.18 and d.(calcd.) = 1.16 for Z = 4 (2 mols.​/Z)​. The structure was detd. to obtain accurate information about the geometry of the mol. as there was ambiguity in the chem. structure. The structure was refined to R = 6.3​% for 1165 visually measured reflections. At parameters, bond angles and distances are given. The established structure proposed on the basis of chem. and phys. data. The new structure explains some reactions which could not be understood from the previously proposed structure

trans-​(±)​-​2-​(4-​Methoxyphenyl)​-​4-​oxo-​2,​3,​4,​5-​tetrahydro-​1,​5-​benzothiazepin-​3-​yl acetate

The title compd., C18H17NO4S, is a diltiazem-​related compd. The mol. packing is predominantly stabilized by H bonding; amide groups H bond with adjacent mols. to form centrosym. dimers. The seven-​membered ring is distorted, showing a twist-​boat conformation. The benzene ring is planar but the methoxyphenyl ring deviates significantly from planarity. The relative configuration of the methoxyphenyl and acetoxy groups is gauche. Crystallog. data and at. coordinates are given

Structure of ethyl 1-cyanomethyl-5-methoxy-3-phenylindole-2-carboxylate

C20HI8N203, M r = 334.38, orthorhombic, Pbca, a = 7.179 (3), b = 33.014 (3), c = 14.847 (1) A, V = 3518.85/~3, Z = 8, Dx = 1.262, D m = by 53.1 (3) °. The C--C~N chain is linear and makes a dihedral angle of 77.9 (3) ° with the mean plane of the indole ring. The mean plane of the carboxyl group makes a dihedral angle of 25.4 (3) ° with the indole moiety

Structure of 4,​6-​diacetylresorcinol

The title compd. is monoclinic, space group P21/c, with a 7.089(1)​, b 11.361(1)​, c 11.656(1) Å, and β 100.45(3)​°; Z = 4, dm = 1.410(5)​, dc = 1.397; T = 300 K; final R = 0.057 for 1701 reflections. At. coordinates are given. The mol. is almost planar, with O(9) and O(12) of the acetyl groups deviating by 0.074(1) and 0.071(2) Å from the mean plane of the benzene ring. The bond lengths and bond angles of the benzene ring are normal. There are intramol. H bonds between O(9) and H(14) and between O(12) and H(13)​; there are no intermol. H bonds. The mols. are packed in layers parallel to the ac plane and are held together essentially by van der Waals interactions

5(S)​-​cyano-​9-​oxotricyclo[4.2.1.1.4,​7]​dec-​2-​en-​8-​yl methanesulfonate

The title compd. is orthorhombic, space group Pca21, with a 10.159(5)​, b 8.656(3)​, and c 13.950(5) Å; d.(exptl.) = 1.43 and d.(calcd.) = 1.45 for Z = 4. The structure was solved by the Patterson search method and refined to R = 0.054 for 960 reflections. At. parameters, bond lengths, and bond angles are given. No H bonding is obsd. and the structure is held together by van der Waals interactions

PERENCANAAN JARINGAN BACKBONE NOTHERN ROUTE MENGGUNAKAN TEKNOLOGI WAVELENGTH DIVISION MULTIFLEXING (WDM)UNTUK MENGKOMODASI KEBUTUHAN KANAL SAMPAI TH 2008

ABSTRAKSI: Kata Kunci : ABSTRACT: Keyword

Ethyl 2-​amino-​5,​6,​7,​8-​tetrahydro-​4H-​cyclohepta[b]​thiophene-​3-​carboxylate.

Crystals of the title compd. are monoclinic, space group P21/c, with a 9.580(3)​, b 9.552(2)​, c 13.677(4) Å, β 99.489(4)​°; Z = 4, dc = 1.288; R = 0.038, Rw(F2) = 0.102 for 2487 reflections. The terminal ester group lies in the plane of the thiophene ring system. The cycloheptene ring adopts a half-​chair conformation. There are intramol. N-​H···O and C-​H···O interactions, and intermol. N-​H···O and C-​H···π interactions

Ethyl 2-amino-5,6,7,8-tetrahydro-4H-cyclo-hepta[b] thiophene-3-carboxylate

In the structure of the title compound, (C12172S)-S-H-S-NO, the terminal ester group lies in the plane of the thiophene ring system. The cycloheptene ring adopts a half-chair conformation. There are intramolecular N-HO and C-HO interactions, and intermolecular N-HO and C-H interactions