olefin

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Related to olefinic: allylic

al·kene

(al'kēn),
An acyclic hydrocarbon containing one or more carbon-carbon double bonds; for example, ethene, propene.
Synonym(s): olefin

al·kene

(al'kēn)
An acyclic hydrocarbon containing one or more double bonds; e.g., ethene, propene.
Synonym(s): olefin.
References in periodicals archive ?
Three olefinic POSS additives were examined: vinyl, allyl and methacrylate POSS.
Signals of olefinic carbon nuclei were seen at I'C140.1 and 121.7, anomeric methine carbon resonated at I'C101.7 and 101.1, whereas, methyl carbon signals displayed their position at I'C 18.6, 17.5, 16.6, 16.5, 15.0 and 13.6.
The relatively high hydrogen consumption of run KH-4 was probably caused by the longer time of hydrogenation of olefinic compounds.
Ethylene ([C.sub.2][H.sub.4]): An olefinic hydrocarbon recovered from refinery or petrochemical processes, which is gaseous at standard temperature and pressure.
198-200[degrees]C; IR (KBr) [gamma]: 1598 (C=N) [cm.sup.-1]; [sup.1]HNMR (DMSO-[d.sub.6]) [delta]: 1.25-2.26 (m, 6H, 3xC[H.sub.2]), 2.76 (d, 1H, CH pyrazole), 3.71 (d, 1H, CH pyrazole), 3.74-3.81 (s, 12H, 4xOC[H.sub.3]), 6.03 (s, 1H, CH- olefinic), 6.64-7.77 (m, 11H, Ar-H).
While the -C[H.sub.2] linked with the olefinic double bond is at [delta] 2.03-2.08ppm, characteristic peaks for -C[H.sub.2] attached to amide nitrogen and that of amide carbonyl were both present at [delta]3.87 -3.8ppm and [delta] 2.4-2.29 ppm respectively.
The structure of the trans-caffeoyl moiety was established by [.sup.1]H NMR data showing two vicinal olefinic protons [delta]H 7.61 d,J = 15.87Hz and [delta]H 6.29, d, j = 15.89 Hz.
It includes outer layers made of a polyester resin and at least one inner layer arranged between the outer layers comprising an olefinic resin containing 45% by weight or more of at least one ethylene-propylene-butene terpolymer based on the total weight of the inner layer.
This patent describes a new family of catalysts that are very active in both the homopolymerization and copolymerization of unsaturated monomers, including nonpolar and polar olefinic monomers.
Because of olefinic material (unsaturated carbon bonds), it is more prone to oxidation and polymerization (varnish formation).
Features include non-spill shut-off valves, color-coding to distinguish various media lines and olefinic overmolding.