The structure of cycloalliin hydrochloride monohydrate

Palmer, Kenneth J.; Lee, K. S.

doi:10.1107/s0365110x66001865

Cited by 17 publications

(2 citation statements)

References 7 publications

(7 reference statements)

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“…A similar ring system is found in the tetrahydrothiophene ring in biotin (De Titta, Edmonds, Stallings & Donohue, 1976), where the S atom is 0.87 A out of the C plane and the C-S-C angle is 89.4 ° The C-S bond lengths of 1.798 and 1.852 A are within the range observed in heterocyclic molecules (Abrahams, 1956). The S-O bond length of 1.491 A agrees well with the values observed in other sulfoxides such as cycloalliin (Palmer & Lee, 1966). The molecular packing is illustrated in Fig.…”

Section: ~1491supporting

confidence: 74%

cis-2-Phenyl-4-thiolanone 1-oxide

Childers¹,

Folting²,

Merritt³

et al. 1977

Acta Crystallogr Sect B

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Section: ~1491supporting

confidence: 74%

cis-2-Phenyl-4-thiolanone 1-oxide

Childers¹,

Folting²,

Merritt³

et al. 1977

Acta Crystallogr Sect B

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“…The same axial position for the ionized carboxyl group has been observed for chondrine (Palmer, Lee, Wong & Carson, 1972); furthermore, in the case of cycloalliin (Palmer & Lee, 1966) the unionized carboxyl group is equatorially oriented.…”

Section: Commentsupporting

confidence: 51%

(3R,5R)-Tetrahydro-2H-1,4-thiazine-3,5-dicarboxylic acid monohydrate

Portalone¹,

Cassetta²,

Zecchini³

et al. 1993

Acta Crystallogr C

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The Crystal and Molecular Structure of 1‐Methyl‐1‐Thionia‐Cyclohexane Iodide

Gerdil

1974

Helvetica Chimica Acta

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Summary. Crystals of 1-methyl-1-thionia-cyclohexane iodide are orthorhombic with space group PnaZ1, a = 18.036, b = 6.611, c = 7.420 k, 2 = 4. The crystal structure was solved by the heavy-atom method. Very strong parameter interactions prevented least-squares refinement of atoms other than S and I. The molecule adopts the chair conformation with the methyl group in equatorial position.Saturated ring systems containing one or several sulfur atoms have been less studied than those containing elements of the second period, though theoretically interesting conformational features might be associated with the different oxidation states of sulfur. Several cases are known where a bulky exocyclic group attached to an heterosulfur atom prefers to adopt an axial position [l]. The question might arise as to the orientation of a group attached to formally positive sulfur, as in cyclic sulfoniums. We now report the structure of 1-methyl-thionia-cyclohexane iodide (1) as determined by X-ray analysis. systematic extinctions is consistent with the space groups Pna2, and Pnam (Pnma, with the appropriate axis setting). At a later stage of the investigation, Pna2, proved to be correct. The crystalline compound 1 is very prone to decomposition under X-ray irradiation, and four crystals were necessary to collect the 1280 reflections used in this determination. Intensity data were measured on a Hilger & Watts Y190 linear diffractometer by the moving crystal-stationary counter method, with balanced filter and Mo radiation, a t an w-scan standard time of 140 sec. The main set of 1060 reflections was collected by rotating the crystal about the c axis; the correlation factors to bring reflections of various layers to a common intensity scale were calculated by a leastsquares procedure including reflections collected from a crystal rotated about the b axis. No corrections were made for absorption.Structure Analysis and Refinement. -The heavy-atom method was used for the determination of the atomic positions of the iodine and sulfur atoms from a three-dimensional Patterson synthesis. The number of molecules in the unit cell suggests space group PnaZl rather than Pnma, unless m is also a mirror plane for the ion-pair C,H13S+I-; the latter possibility entails relationships among the variables of the Harker lines. The relationships were absent in the Patterson synthesis, which, on the PnaZl assumption, allowed straightforward determination of the coordinates of the I and S atoms (21 was arbitrarily fixed at zero). Two-and then three-dimensional Fourier syn-

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The structure of cycloalliin hydrochloride monohydrate

Cited by 17 publications

References 7 publications

cis-2-Phenyl-4-thiolanone 1-oxide

cis-2-Phenyl-4-thiolanone 1-oxide

(3R,5R)-Tetrahydro-2H-1,4-thiazine-3,5-dicarboxylic acid monohydrate

The Crystal and Molecular Structure of 1‐Methyl‐1‐Thionia‐Cyclohexane Iodide

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