A refinement of the crystal structure analyses of oxalic acid dihydrate

Ahmed, F. R.; Cruickshank, D. W. J.

doi:10.1107/s0365110x53001083

Cited by 95 publications

(33 citation statements)

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“…Bond lengths, with their e.s.d. 's calculated according to the equation of Ahmed & Cruickshank (1953), and bond angles are given in Fig. 3 in the same schematic form as for alphaprodine (Kartha, Ahmed & Barnes, 1960, Fig.…”

Section: Resultsmentioning

confidence: 99%

The crystal and molecular structure of dl-betaprodine hydrobromide

Ahmed¹,

Masironi²

1963

Acta Crystallogr

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The crystal structure of the hydrobromide of d/-betaprodine (beta d/-1,3-dimethyl-4-phenyl-4-propionoxypiperidine) has been determined by the heavy-atom method from three-dimensional intensity data collected with a scintillation-counter diffraetometer. The structure has been refined by three cycles of differential syntheses to an R-factor of 0-10, and the hydrogen atoms of the molecule of betaprodine have been located from a three-dimensional difference synthesis. In the betaprodine molecule the piperidine ring has the chair form with the phenyl ring equatorial and the propionoxy chain axial as in the alpha isomer, but the methyl group on C(3) now is axial, instead of equatorial, and is cis to the phenyl ring on C(4).

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Section: Resultsmentioning

confidence: 99%

The crystal and molecular structure of dl-betaprodine hydrobromide

Ahmed¹,

Masironi²

1963

Acta Crystallogr

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“…The coordinates of the atoms in a single chain (chain 0) for this arrangement are given in Table 3, and it will be seen that the structure is quite satisfactory from the stereochemical point of view. The dimensions of the peptide group are as given in Corey & Pauling (1953). Table 4.…”

Section: (C) Derivation Of Atomic Coordinatesmentioning

confidence: 99%

Structure of poly-L-hydroxyproline

Sasisekharan¹

1959

Acta Crystallogr

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“…Bond lengths and valence angles with their estimated standard deviations, calculated according to Ahmed & Cruickshank (1953) and Darlow (1960) respectively, are reported in Table 3 and shown in Fig. 1.…”

Section: Resultsmentioning

confidence: 99%