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A macrocyclic hexamer, the structure of which is reminiscent of part of the bamboo-plant stem (see picture), was directly prepared by the condensation of a glycoluril derivative and formaldehyde. TheExpand
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Berberine and coptisine free bases
Abstract The free bases of protoberberine alkaloids berberine and coptisine and related compounds have been examined. The 1H and 13C NMR data of 8-hydroxy-7,8-dihydroberberine (2a),Expand
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Molecular and crystal structures of (+)-homochelidonine, (+)-chelamine, and (−)-norchelidonine
Abstract The molecular and crystal structures of three hexahydrobenzo[c]phenanthridine alkaloids (+)-homochelidonine (1), (+)-chelamine (2), and (−)-norchelidonine (3) have been examined by X-rayExpand
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Glycoluril dimers bearing hydrogen atoms on their convex face and their self-assembly in the solid state.
A selective method for the synthesis of 1,6-substituted glycolurils has been developed. The glycolurils have been used for the synthesis of methylene-bridged glycoluril dimers bearing hydrogen atomsExpand
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In the crystal sructure of the title compound, C17H21NO, the molecular packing is stabilized by intermolecular hydrogen bonds and additional weak N—H⋯π interactions, forming chains that propagate along the b axis. Expand
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Electron density shift in imidazolium derivatives upon complexation with cucurbit[6]uril.
In this study, we have investigated the supramolecular interaction between series of 1-alkyl-3-methylimidazolium guests with variable alkyl substituent lengths and cucurbit[6]uril (CB6) in theExpand
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Water-mediated inclusion of benzoates and tosylates inside the bambusuril macrocycle.
A supramolecular complex between benzoates and a bambusuril crystallizes out immediately after mixing in chloroform but only in the presence of residual water molecules. In this complex each of theExpand
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Remarkable salt effect on stability of supramolecular complex between modified cucurbit[6]uril and methylviologen in aqueous media.
The supramolecular complex formed by partial inclusion of methylviologen in MeCB6 was described both in solution and in the solid state. The association constant of the complex was determined usingExpand
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Fused Tetracyclic Heterocycles by Thermally Initiated Intramolecular Criss-Cross Cycloaddition of 3-Substituted Homoallenylaldazines
A thermally initiated intramolecular criss-cross cycloaddition of 3-substituted symmetrical homoallenyl azines (5) was searched. Their cyclization led to interesting new fused heterocyclic systemsExpand
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1,3-Diethynylbicyclo[1.1.1]pentane, a Useful Molecular Building Block
1,3-Diethynylbicyclo[1.1.1]pentane (DEBCP) has been found to be a valuable molecular building block mostly for the synthesis of extended, rigid, rod-like molecules. With its straightforward linearExpand
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