| 释义 |
spirane Chem.|ˈspaɪəreɪn|
Also spiran |-æn|.
[ad. G. spiran: see spiro- 2 and -ane.]
Any organic compound having two rings in the molecule with a single atom (usu. of carbon or nitrogen) common to both; a spiro-compound.
In quot. 1919 used attrib. of the shared atom.
1911Jrnl. Chem. Soc. C. i. 497 Spirans or dispirans are homo- or hetero-cyclic compounds containing two rings with a carbon atom common to both. 1919Ibid. CXV. 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. 1950E. de B. Barnett Stereochem. iv. 55 Any spirane in which the rings are identical but unsymmetrical should be enantiomorphic. 1972Natta & 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. 1978R. 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. |