Isomerism of benzoquinone-monoximes (nitrosophenols). VIII. The crystal structure of α-2-chloro- and α-bromo-5-methyl-<i>p</i>-benzoquinone-4-oxime

Romers, C.; Fischmann, E.

doi:10.1107/s0365110x6000193x

Cited by 7 publications

(2 citation statements)

References 6 publications

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“…The function @0(xy) is the ordinary projection of the electron density; the latter two functions are the cosine function C~ and the sine function Sz based upon two-dimensional Fourier summations with Fourier coefficients 2'(hkl) (Cochran & Dyer, 1952;Romers & Fischmann, 1960;Fischmann, MacGillavry & Romers, 1961).…”

Section: Determination Of the Structurementioning

confidence: 99%

Isomerism of benzoquinone monoximes (nitrosophenols). XII. The crystal structure of β-5-n-propoxy-o-quinone-2-oxime

Romers¹

1964

Acta Cryst

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The crystal structure of fl-5-n-propoxy-o-quinone-2-oxime has been determined by comparison with those of the isomorphous fl-5-(2'-bromoethoxy)-and fl-5-(2'-chloroethoxy)-o-quinone-2-oxime. The unit-cell dimensions of the propoxy compound at -120 °C are a --10.64, b = 12.57, c = 6.63 A, fl =95 ° 31', Z =4. The space group is P2Jc. The structure was refined by the method of leastsquares with data collected at -120 °C. The mean value of two short distances (1.35 A) and four long distances (1.45 A) in the hexagonal ring and the length of the carboxyl bond (1"27 A) indicate a predominantly oxime-like structure. The intramolecular hydrogen-bonded NOH and CO groups are in the syn position. The CHa-C~H4-O-grou p has the gauche conformation. The molecule is planar with the exception of the methyl group which is 1.22 A outside the plane of the molecule. Exceptionally short intermolecular distances (3.12, 3.25 A) are found between molecules in adjacent layers in the direction of the c axis.

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Section: Determination Of the Structurementioning

confidence: 99%

Isomerism of benzoquinone monoximes (nitrosophenols). XII. The crystal structure of β-5-n-propoxy-o-quinone-2-oxime

Romers¹

1964

Acta Cryst

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“…Such studies have shown that these compounds exist largely in the 1,2-quinone monooximic form (Ia) in the solid state and exhibit geometric isomerism centred on the orientation of the oximic OH group relative to the quinoid carbonyl group (Romers & Fischmann, 1960;Romers, 1964). Like the 5-hydroxy-substituted 1,2-benzoquinone monooximes (Charalambous, Christidis, Dodd, McPartlin, Pathirana & Talee, 1991), aminosubstituted 1,2-quinone monooximes could exist in several other isomeric forms.…”

Section: Commentmentioning

confidence: 99%