PENNSYLVANIA STATE UNIV UNIVERSITY PARK CRYOGENIC LAB
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Me sub3 N sub-2 H and Me sub4 N sub2 were synthesized and their physical properties were determined. A comparison of the bps of the methylhydrazines, methylamines, and hydrocarbons of similar structure showed a similar trend for the 2 series relative to the hydrocarbons which was attributed to a decrease of H bonding with the introduction of Me groups into N sub2 H sub4 and NH sub3, respectively. The decomposition of N-trimethylamine-N-methylimide is discussed. The heat capacities of unsym-Me sub2 N sub2 H sub2 were measured from 12 deg to 298.16 deg K. A triple point at 215.951 deg or - 0.005 deg K, a heat of fusion of 2407.4 or - 1.5 calmol, and a heat of vaporization of 8366 or - 4 calmol at 298.16 deg K were obtained. The entropy of the ideal gas at 298.16 deg K and 1 atm was 72.80 or - 0.3 caldeg K-mol. For the molecule assumed to be in the gauche form, a barrier of 3000 calmol was obtained for the internal rotation of the amino group. Published papers are included on 1 the synthesis and properties of Me sub3 N sub2 H J. Am. Chem. Soc. 732369, 1951 2 infrared and Raman spectra of MeN sub2 H sub3 and sym-Me sub2 N sub2 H sub2 J. Chem. Phys. 19704-7, 1951 3 heats of combustion of Me-substituted hydrazines and observations of the burning of volatile liquids J. Am. Chem. Soc. 742484, 1952 4 entropy and configuration of MeN sub2 H sub3 J. Chem. Phys. 171352-53, 1949 and 5 heat capacity, heats of fusion and vaporization, vapor pressures, and thermodynamic functions of MeN sub2 H sub3 J. Am. Chem. Soc. 731939, 1951 and of sym-Me sub2 N sub2 H sub2 J. Am. Chem. Soc. 731943,1951.
- Organic Chemistry