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Structure of an unusually non-polar hydroxy ether
M M Olmstead1, M E Price, J Strutzel
1Department of Chemistry, University of California, Davis 95616.
Summary
This study details the crystal structure of a novel tricyclic compound, revealing a unique framework and lower polarity compared to its stereoisomer. The structure suggests a potential intramolecular hydrogen bond.
Area of Science:
- Organic Chemistry
- Crystallography
- Molecular Structure
Background:
- Spectroscopic and chemical data alone were insufficient to elucidate the compound's connectivity.
- Understanding the precise three-dimensional arrangement of atoms is crucial for predicting chemical and physical properties.
Purpose of the Study:
- To determine the exact molecular structure of (1R*,3R*,7S*,9S*)-1,4,4-Trimethyl-9-(tert-butyldimethylsilyloxy)-exo-11-oxatricyclo[5.3.1.0(2,6)]-undecan-3-ol.
- To investigate the structural relationship and polarity differences between stereoisomers.
Main Methods:
- Single-crystal X-ray diffraction analysis was performed at 130 K.
- The crystal structure was solved in the orthorhombic space group Pbca.
Main Results:
- The compound exhibits a tricyclic framework, featuring an O-bridged bicyclo[3.2.1]octane fused cis-exo to a cyclopentanol ring.
- A significantly lower polarity was observed compared to its cyclopentanol stereoisomer.
- The proximity of the bridging oxygen to the hydroxyl oxygen suggests a possible intramolecular hydrogen bond.
Conclusions:
- The crystal structure provides definitive connectivity and stereochemical information for the complex molecule.
- The observed lower polarity is attributed to the specific arrangement of functional groups within the tricyclic system.
- Further investigation may be warranted to confirm the proposed intramolecular hydrogen bonding.