510. Micro-determination of the molecular weights of picrates by a spectrophotometric method

Cunningham, K. G.; Dawson, W.; Spring, F. S.

doi:10.1039/jr9510002305

Cited by 39 publications

(8 citation statements)

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“…The formation of molecular complexes from many otherwise stable aromatic entities is a well-established phenomenon, and by now a rather intensively investigated one also. The number of books (25,194) and reviews (8,26,63,187,236) published on the subject, the importance of such complexing in analytical spot-test procedures (73), and the recent use of picrates for the spectrophotometric determination of adduct molecular weights (53,224,227) all attest adequately to the above assertions.…”

Section: Intkoductionmentioning

confidence: 96%

Energetics Of Molecular Complexes

McGlynn¹

1958

Chem. Rev.

184

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In general A or D may7 be molecules, molecule-ions, or atom-ions, but with the restriction that they7 are both in their totally symmetric ground states. With these restrictions the principal contributing term in the wave function of the ground state of the complex, 0 itself is the wave function corresponding to a structure for the complex in which the binding of the two components is effected by classical intermolecular forces such as dipoledipole, ion-dipole, dipole-induced dipole interactions, etc., by7 hydrogen bonding, or by perturbation effects of higher order such as London forces. 0 is denoted the no-bond wave function. , the dative-bond wave function, corresponds to a structure of the complex in which an electron has transferred from the donor to the acceptor, and in which, besides all the forces listed above as operative in the structure corresponding to , there may also be weak chemical binding between the odd electrons now situated on the two components of the complex. If A and D are both neutral species, ion-ion attractive forces may account for a large part of the binding energy of the dative structure.If the donor is a weak base and the acceptor a weak acid, then frequently a third term, representing electron transfer from the acceptor to the donor, may

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Section: Intkoductionmentioning

confidence: 96%

Energetics Of Molecular Complexes

McGlynn¹

1958

Chem. Rev.

184

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“…This. picrate was used to determine the molecular weight of the scopinium base by the method of Cunningham, Dawson & Spring (1951). The Using the method described for hydrogenation of scopinium, we were able to obtain pseudoscopine, with melting point 124 to 1260 C; Polonovski & Polonovski (1928) found 125 to 1260 C, and Heusner & Zeile (1958) 122 to 123°C.…”

Section: Chemical Methodsmentioning

confidence: 99%

Pharmacology of Scopinium Bromide

Monti

Vidal-Beretervide

1966

British Journal of Pharmacology and Chemotherapy

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“…Determinations of the molecular weight of the picrate by the method of Cunningham, Dawson & Spring (1951) gave values of 361 and 358. The value expected for the picrate of isopelletierine is 370.…”

Section: Total Comentioning

confidence: 99%

Plant enzyme reactions leading to the formation of heterocyclic compounds. 3. Plant amine oxidase and the formation of pyrrolidine and piperidine alkaloids

Clarke

Mann

1959

Biochemical Journal

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palmitostearo-olein 28 3 %) and 58-9 % of monosaturated-diunsaturated glycerides (hexadecenooleopalmitin 25-0 %, hexadeceno-oleostearin 10-7 % and palmitodiolein 23-2 %). No triunsaturated glyceride was found. The experimental values for the distribution of acyl groups in the glycerides of wild-boar fat, together with the computed values of the 'even' and 'random' types, are given in Table 8, and it is clear that wild-boar fat follows the rule of 'even' distribution, according to which the component fatty acids tend to be distributed as widely as possible among all the triglyceride molecules. In this respect wild-boar fat does not fall into line with the general land-animal type of fat. The 'random' distribution would require an appreciable amount of fully saturated triglycerides, lower proportions of disaturated-mono-unsaturated, and monosaturated-diunsaturated glycerides, and an appreciable quantity of triunsaturated glycerides. As the wild-boar fat follows the 'even-distribution' pattern, Kartha's (1953) theory of restricted random distribution need not be discussed. SUMMARY 1. The composition of the depot fat from a wildboar (Su8 cri8tatu8 indicu8) has been studied. The mixed acids were separated by applying the lead salt-ethanol method and their composition was studied by the ester-fractionation procedure. 2. The proportions of individual fatty acids in the fat were, in general, similar to those in the fats of other herbivorous animals and were very close to those of pig fat. 3. The glyceride structure of the wild-boar fat has been investigated by low-temperature crystallization of neutral fat with acetone and ether as crystallizing medium. Three main fractions thus obtained were studied separately and possible glyceride composition was computed from the observed data. 4. The observed glyceride pattern inwild-boar fat follows Hilditch's rule of' even distribution' and so it does not correspond with general land-animal types. The authors wish to express their thanks to the authorities of the Banaras Hindu University for providing research facilities.

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510. Micro-determination of the molecular weights of picrates by a spectrophotometric method

Cited by 39 publications

References 0 publications

Energetics Of Molecular Complexes

Energetics Of Molecular Complexes

Pharmacology of Scopinium Bromide

Plant enzyme reactions leading to the formation of heterocyclic compounds. 3. Plant amine oxidase and the formation of pyrrolidine and piperidine alkaloids

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