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Digitale Medien

Structure reactivity correlation in inclusion complexes: Deoxycholic acid-thiocamphenilone (1987)

Padmanabhan, K. ; Ramamurthy, V. ; Venkatesan, K.

Springer

Journal of inclusion phenomena and macrocyclic chemistry 5 (1987), S. 315-323

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ISSN: 1573-1111

Schlagwort(e): Deoxycholic acid ; thiocamphenilone ; crystal structure ; potential energy calculations

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Abstract The 2∶1 inclusion complex formed between deoxycholic acid (C24H40O4,M r =392.58) and thiocamphenilone (C9H14S,M r =154.28) crystallizes in the space groupP21212 witha=13.738(2),b=27.203(4),c=7.189(1) Å andZ=4. The structure was refined toR=0.158 andR w =0.195 for 1649 observed reflections with |F o |≥3.0σ|F o |. The crystal structure is characterized by an assembly of anti-parallel pleated bilayers, formed by molecules of deoxycholic acid held together through hydrogen bonds. The guest thiocamphenilone occupies the crystallographic two-fold axis and is disordered. The orientation of the guest molecule obtained from crystallographic data is consistent with the results obtained from the potential energy calculations.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00665364

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Digitale Medien

Intramolecular orientation at the micellar interface: Control of norrish type I and type II reactivity of benzoinalkylethers via conformational effects (1988)

Devanathan, S. ; Ramamurthy, V.

Chichester : Wiley-Blackwell

Journal of Physical Organic Chemistry 1 (1988), S. 91-102

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ISSN: 0894-3230

Schlagwort(e): Organic Chemistry ; Physical Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Notizen: The photolysis of benzoinalkylethers 1-5 solubilized in detergents show a significant deviation from the course of reaction in isotropic organic solvents. Remarkable difference in photobehaviour is noticed between the short chain (1-3) and the long chain (4 and 5) benzoinalkylethers in the micellar media. However, the influence of the micellar media on the photobehaviour of alkyldeoxybenzoins 6 and 7 was small. The importance of ‘cage effect’ in controlling the product distribution was evident from its dependence on the micellar size and on the occupancy number. More importantly, a comparative analysis of the photobehaviour of the ketone 1-7 reveals that the micellar interface can be used to control the conformations of organic molecules.

Zusätzliches Material: 1 Ill.