| 单词 | partial valency |
| 释义 | > as lemmaspartial valency partial valency n. [after German Partialvalenz (J. Thiele 1899, in Ann. der Chem. 306 89)] Chemistry (now historical) a partially unsatisfied valency formerly attributed to some atoms in unsaturated compounds to account for the addition reactions of olefins and the stability of the benzene ring. ΘΚΠ the world > matter > chemistry > valency > [noun] > partial valency partial valency1899 1899 Jrnl. Chem. Soc. 76 i. 554 The author holds the view that, in unsaturated compounds, whilst two affinities of every atom which participates in the double linking are occupied with those of the contiguous atom, the combining energy is not completely absorbed, so that the atoms in question still possess valency (Partialvalenz), and it is in this partial valency that the source of additive capacity is to be found. 1964 N. G. Clark Mod. Org. Chem. xix. 394 When applied to a conjugated system, such as occurs in buta-1,3-diene, Thiele postulated the union of the centre pair of partial valencies, thus creating a relatively inert type of double bond between C2 and C3, and leaving reactive partial valencies only at C1 and C4. < as lemmas |
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