单词 | spirane |
释义 | spiranen. Chemistry. Any organic compound having two rings in the molecule with a single atom (usually of carbon or nitrogen) common to both; a spiro-compound. In quot. 1919 used attributively of the shared atom. ΘΚΠ the world > matter > chemistry > organic chemistry > [noun] > organic structure > cyclic or ring compounds > bicyclic spirane1911 1911 Jrnl. Chem. Soc. 100 i. 497 Spirans or dispirans are homo- or hetero-cyclic compounds containing two rings with a carbon atom common to both. 1919 Jrnl. Chem. Soc. 115 i. 323 Strains existing in one ring of a spiro-compound could not possibly make themselves felt in the second ring unless communicated by a spirane carbon atom, which itself is in a state of strain. 1950 E. de B. Barnett Stereochem. iv. 55 Any spirane in which the rings are identical but unsymmetrical should be enantiomorphic. 1972 Natta & Farine Stereochem. iv. 113 A class very similar to the allenes consists of the spirans—bicyclic compounds whose rings are attached to only one atom. 1978 R. L. Baumgarten Org. Chem. xvii. 289 Biphenyls substituted with bulky ortho substituents, substituted allenes, and spiranes are among the classes of compounds that exhibit optical although there is no asymmetric carbon atom present. This entry has not yet been fully updated (first published 1986; most recently modified version published online December 2020). < n.1911 |
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