1936
DOI: 10.1021/ja01292a043
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Heats of Organic Reactions. IV. Hydrogenation of Some Dienes and of Benzene

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Cited by 233 publications
(141 citation statements)
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“…It is also interesting to note that exaltation is observed in styrene (XVIII), for which Amax = A, exaltation = 0-6 unit, and in propenyl benzene (XIX), but not in allyl benzene (XX) (Eisenlohr 1912, p. 105). a number of heats of hydrogenation; but the values so obtained are not in agreement with recent measurements by Kistiakowsky (1936), who finds, for instance, that whereas the hydrogenation of many unsaturated systems (e.g. cyclohexene, cycZopentadiene, butadiene) proceeds exothermically, the formation of 1 : 3-cycZohexadiene by hydrogenation of benzene is endothermic.…”
Section: C6 H 5-c H = C H -C H = C H -Ceh 5 C6h 5-c H^c H -C H = C H contrasting
confidence: 92%
“…It is also interesting to note that exaltation is observed in styrene (XVIII), for which Amax = A, exaltation = 0-6 unit, and in propenyl benzene (XIX), but not in allyl benzene (XX) (Eisenlohr 1912, p. 105). a number of heats of hydrogenation; but the values so obtained are not in agreement with recent measurements by Kistiakowsky (1936), who finds, for instance, that whereas the hydrogenation of many unsaturated systems (e.g. cyclohexene, cycZopentadiene, butadiene) proceeds exothermically, the formation of 1 : 3-cycZohexadiene by hydrogenation of benzene is endothermic.…”
Section: C6 H 5-c H = C H -C H = C H -Ceh 5 C6h 5-c H^c H -C H = C H contrasting
confidence: 92%
“…For the standard heat of formation from the elements at 25° C, values for the diolefins, C3 to C5, were obtained as follows: 1,3-Butadiene, from reference [27]; 1,2-butadiene, from reference [28]; propadiene, cis-and trans-1,3-pentadiene, and 1,4-pentadiene, from combination of the data on heats of hydrogenation from references [36,37] with the values for the heats of formation of the corresponding paraffin hydrocarbons from reference [29]; by calculation, using the relations between energy content and molecular structure given in references 129, 30,31,32,33]. The values so calculated are believed to be uncertain by not more than about ±0.75 kcal/mole.…”
Section: Heat Of Formation Free Energy Of Formation and Equilibmentioning
confidence: 99%
“…The selected value previously used [1] for the heat of hydrogenation of 1,3-butadiene to n-butane, at 25° C, was obtained from the selected value for the heat of h) drogenation at 82° C [2] corrected to the new atomic weight of carbon and converted to 25° C [1], using an estimated value for the difference in heat capacities of 1,3-butadiene and n-butane, with the known heat capacity of hydrogen [23]. The conversion of the heat of hydrogenation from 82° to 25° Chad previously been taken as C4H6(gas, 1,3-butadiene)+2H2(gas)=C4H IO (gas, n-butane) (1) !J.H0355 .16-!J.H0298.16= -0.500 ± 0.100 kcaljmole.…”
Section: 3-butadienementioning
confidence: 99%
“…The previously published value from this laboratory for the heat of formation of 1,3-butadiene from its elements [1) 2 is based on a combination of values of the heat of hydrogenation of 1,3-butadiene to n-butane [2), the heat of combustion of n-butane (3), the heat of formation of water from its elements [4), and the heat of formation of carbon dioxide from its elements [5). Because a new "best" value for the heat of formation of carbon dioxide ~6) and new data on the heat capacities of n-butane f7) and 1,3-butadiene [8,25,26)lu.ve become available, a revised value for the heat of forma tion of 1,3-butadiene can be calculated .…”
Section: Introductionmentioning
confidence: 99%