In t he co urse of a contin uin g investigation of the knock rat in gs of alip hatic hydrocarbons, pu re paraffin s and olefins have been prepared in quantities suffi cien t for en gin e teBts. Thi s reports describes the m eth ods of preparation a nd purification of t hree pcntancs. four hcxane , t hree heptanes, ro ur octanes, e igh t nonanes, seven decancs, fou r hexe nes, fi ve octenes, s ix nonenes, s ix dccencs, and a number of alcohoL, ketones, esters, and alky l hal ides . Most of t hese compounds were hi ghly pu r ified . Phys ical co nstants m casured include f rcez in g point, bo iling po in t, and its va ri ation w ith press ure, rcfractive index, a nd d ensity, and t hcir variations with temperat ure. **
As a part of a stud y of the desirability of certain h ydrocarbon types as jet fu el components, e ight a liphatic h ydro carbons have been prepared and purified. This report describes their syn theses an d those of several in termedi ates. Physical constants were measured on t he high puri ty products.
In an investigation of t he physical properties of hydr<;>gen isotopes it was n.e cessar.\:' t o prepare 10 liters of high-purity. hydro~en d~u.tende. TI1JS was don e ~y r eactmg IJ t hlUm aluminum h ydride wit h deutenum oXIde, gly.;n~ hy dro~e n d eu tende, ]I) .t wo ba tc h~s, ?f 98.1-and 97.0-percent purity, respect ive!.\:' . .Ihls mater!ai was t hen frac t IOnated at JtqUJd hydrogen t emperature in t hree batches, Yleldmg the d esIred amoun t of h ydrogen de utende in a puri ty of 99.8 percent.
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 .
As a part of researches conducted on hydrocarbons a s jet-fuel components under the auspices of the National Advisory Committee for Aeronautics, a number of acetylenic hydrocarbon s and their intermediates have been prepared. The d etails of these syntheses and the physical constants m easured on th e compounds are presented.
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