Oxymethylene

Ox`y`meth´yl`ene


n.1.(Chem.) Formic aldehyde, regarded as a methylene derivative.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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The 1H-NMR spectrum of the compound 1 showed an oxymethylene signal at I' 3.82 (2H, t, J = 7.0 Hz), one methylene signal at I' 1.15 as quintet (2H, J = 6.4, 7.1 Hz), one oxymethine signal at I' 2.05 (1H, m), and an envelope of methylene signals at I' 1.17-1.45 as a broad multiplet (58 H).
Oxymethylene ethers (OM[E.sub.n], C[H.sub.3](OC[[H.sub.2]).sub.n]OC[H.sub.3]) [12, 13] are currently investigated to optimise PM emission behaviour of diesel combustion.
Viana, "The local thermomechanical conditions and the fracture behavior of an injection-molded poly(oxymethylene)," Polymer Engineering and Science, vol.
The compound GB-25 has additional one oxymethylene signal and a set of glucose signal compared to GB-24.
The [sup.1]H NMR spectrum exhibited a triplet oxymethylene signal at [delta] 3.62, and its corresponding carbon signal was confirmed at [[delta].sub.C] 63.1.
Two oxymethine carbons peaked at 75.29 (C-9) and 74.80 (C-8) ppm and an oxymethylene peak appeared up field at 60.17 (C-19) ppm (see Supporting File 33).
[21] studied the morphology and electrical conductivity of poly(oxymethylene) (POM)/CNT nanocomposites prepared via [micro]IM.
The signal due to the oxymethylene connected with tosylate was shifted to 4.05 ppm (2H, peak d), whereas the signal due to the oxymethylene, which was connected to the hydroxide end group of PEG before substitution, was located at 3.80 ppm.
The [sup.1]H and [sup.13]C NMR spectroscopic data of Compound 1 showed the characteristic signals for an [alpha], [beta]-unsaturated carbonyl group [([[delta].sub.H] 7.57, 1H, br s, H-1; [[delta].sub.C] 160.7, C-1); [[delta].sub.C] 132.8, C-2; [[delta].sub.C] 208.8, C-3], a trisubstituted double bond [([[delta].sub.H] 5.66, 1H, d, 7 = 4.6 Hz, H-7; [[delta].sub.C] 129.2, C-7); [[delta].sub.C] 140.4, C-6], an oxymethine ([[delta].sub.H] 5.39, 1H, d, 7 = 10.1 Hz, H-12; [[delta].sub.C] 76.5, C-12), and an oxymethylene [[[delta].sub.H] 4.01 and 4.00, AB 2H, 7 = 12.8 Hz, [H.sub.2]-20; [[delta].sub.C] 68.0, C-20] of a phorbol ester system [15,16].
Forming oxymethylene (oxane) bridges between hydroxyls is termed formalization.
(1991, 1994) identified the formation of intermediate methoxide[CH[O.sub.3]], poly(oxymethylene)[(C[H.sub.2]O)n], and dioxymethylene[[H.sub.2]C[O.sub.2]] over silver-cerium oxide and ruthenium-cerium oxide at room temperature.