Synthesis and physical properties of several aliphatic and alicyclic hydrocarbons

Abstract

Th c sy nthesis and purifi cation of foul' paraffins, t hree cycloparaffins, six olefins, and fiv e diol cfin s, and t heir interm ediates are desc ribed. These compounds were prepared b.v standard r ea ctions or modifi cation s thereof, and purified by frac t ional di stiJJ ation . Ph ysical prope rties of the h ydrocarbons arc presented , and purity data are given for so m e of th em .

Density, Viscosity, Speed of Sound, and Bulk Modulus of Methyl Alkanes, Dimethyl Alkanes, and Hydrotreated Renewable Fuels

“…Density of 4-methyloctane: □, this study; ■, ref ; ◆, ref ; ◇, ref ; Δ, ref . Density of 2-methylpentadecane: ○, this study; ▲, ref .…”

Electrical and mechanical anharmonicities from NIR‐VCD spectra of compounds exhibiting axial and planar chirality: The cases of (S)‐2,3‐pentadiene and methyl‐d3 (R)‐ and (S)‐[2.2]paracyclophane‐4‐carboxylate

“…As it was checked that substrates and products retain their stereochemical integrity under reaction conditions,25 compound ( S )‐ 1 should be recovered with a high optical yield. In fact, we can attribute to ( S )‐ 1 , having [α] D 25 + 68.5 (Scheme ), an enantiomeric excess of about 79% taking into account the molar rotation ϕ D which can be calculated for this compound by the semiempirical Runge's rule 18, 26…”

“…They are reported in Figure 1 together with the spectra in the fundamental CH‐stretching region. The ε values were obtained by referring to a density of 0.7 g cm −3 17, 18. Two bands of almost equal intensity are observed at high overtones (Δ v = 3 and Δ v = 4), the narrower band at lower energy and the broader one at higher energy.…”

Reactions of Methylene. 2. Ketene and Carbon Dioxide

“…Moreover, the effects of temperature13•20 ~2 2 on relative reaction probabilities are so small that they could easily be due not to activation energies but to thermal effects on steric factors and on quenching of "hot" methylene. 6 Reaction with ketene was proposed4 to proceed via "hot" cyclopropanone, wdiich isomerizes randomly (and therefore in the ratio of 2:1) into the very unstable compound CH2CH2CO, decomposing rapidly into ethylene and carbon monoxide, and into CH2COCH2, which lives long enough to react with oxygen or give rise to various by-products. This is clearly an oversimplified picture, since it has now' been established definitely that methylene not only adds to the double bond but also substitutes into the C-H bonds and abstracts hydrogen.6 •19 1957).…”