propylidenen.
/prəʊˈpʌɪlᵻdiːn/, /prəʊˈpɪlᵻdiːn/, U.S. /proʊˈpɪlᵻˌdin/ Chemistry.
The divalent hydrocarbon radical CH·CH2CH3. Usually attributive or a formative element in chemical names.
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ethylene1853
ethylidene1859
propylidene1876
pentamethylene1887
vinylidene1898
isopropylidene1900
1876 Jrnl. Chem. Soc. 29 i. 894 Propionic aldehyde is treated with phosphoric chloride, and forms a propylidene dichloride homolog[o]us with ethylidene dichloride; its formula is CH3—CH2—CHCl2, and it boils at 85°–87°.
1903 A. J. Walker & O. E. Mott tr. A. F. Holleman Text-bk. Org. Chem. i. 146 Propylene chloride, C3H6Cl2,..is not identical with the reaction-product obtained by treating acetone with phosphorus pentachloride..nor with that from propionaldehyde, CH3·CH2·CHCl2 (propylidene chloride).
1976 Chem. Physics Lett. 37 220/2 The barrier to conversion of propylidene to propylene is greater than in C2H4.
2003 Inorganica Chimica Acta 345 348/2 The propyl complex..undergoes α-elimination at subambient temperatures to form the propylidene complex H2Os3(CO)10(CHCH2CH3).
This entry has been updated (OED Third Edition, June 2007; most recently modified version published online March 2022).
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n.1876