- Synthesis and conformation studies of a dodecaazanonacyclotetratetracontane
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Compound 3 was prepared by self-assembly of 1,3,5-pentanetriamine and aqueous formaldehyde in quantitative yield (Figure 1). This molecule can exist in four well-defined diamond-lattice conformations of symmetries D(2d), S4, C(2v) and D(2d). Low-temperature 13C NMR spectroscopy indicates the existence of three main conformers; their relative populations depend on the solvent used. An extra set of low- intensity lines is also observed. A conformation interconversion scheme is proposed; it involves two additional less populated quasi-diamond-lattice intermediates derived from a helix compressed along its axis. One of these is trapped as a 1:2 clathrate with 1,4-dioxane; its crystal structure is reported.
- Suissa, M. Rachel,Romming, Christian,Dale, Johannes
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p. 3055 - 3065
(2007/10/03)
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- Stabilized acid anhydrides
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Acid anhydrides such as maleic anhydride are stabilized against the deteriorative effects of heat by addition thereto of an inorganic boron-oxygen compound typified by boric acid, boric anhydride, tributly borate, or borax.
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- Synthetic Studies in Carbocyclic Systems : Part I - A new Synthesis of Nopinone
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Base-induced intramolecular nucleophilic displacement of the tosyloxy group of 4-isopropyl-7-tosyloxycyclohexanone affords nopinone , identical with an authentic specimen.
- Murthi, G. S. S.,Mazumder, Alok
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p. 339 - 340
(2007/10/02)
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