1894 Jrnl. Chem. Soc. 66 i. 82 When heated with hydriodic acid and phosphorus, it [sc. ionone] loses water, and yields ionene, C₁₃H₁₈, which boils at 106–107° (10 mm.)... It resembles irene very closely.

1933 Jrnl. Amer. Chem. Soc. 55 4680 That ionene is a true 1,1,6-trimethyltetralin is evidenced by its smooth sulphonation and nitration.

1948 Econ. Bot. 2 42 It [sc. an extract of moss] contributes stability and depth to patchouli, vetyver, coumarin and musk, and ‘elevation’ to alpha ionene.

2007 Northern Echo (Nexis) 12 Apr. 6 The powerful scent of sweet violets plays tricks on the nose because one of its components—a compound called ionene—quickly anaesthetises the noses's [sic] scent receptors.

1969 A. Rembaum in Jrnl. Macromolecular Sci.: Chem. 3 91 In this paper the mechanism of formation of polymers represented by structure (I) will be described, and since these consist of ionic amines the generic name of aliphatic ionenes is suggested.

1989 U.S. Patent 4,851,532 2 The molecular weights of these linear ionenes are generally about 50,000 or less.

2008 F. G. Tonin & M. F. M. Tavares in J. P. Landers Handbk. Capillary & Microchip Electrophoresis (ed. 3) xxxi. 917 High-molecular mass surfactants..as well as cationic polyelectrolytes (ionenes) had all been presented as successful secondary phases for aromatic compounds.