The various isomers including stable structures, carbenes, and diradicals on the C,H, surface have been investigated. The two carbenes propenylidene and cyclopropylidene have been found to have singlet ground states. Vinylmethylene is predicted to have a triplet ground state with a planar diradical
Theoretical study of cyclopropene and its C3H4isomers
β Scribed by Sigrid D. Peyerimhoff; Robert J. Buenker
- Book ID
- 104791541
- Publisher
- Springer
- Year
- 1969
- Tongue
- English
- Weight
- 803 KB
- Volume
- 14
- Category
- Article
- ISSN
- 1432-2234
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π SIMILAR VOLUMES
Six stable isomers and two transition structures were characterized on the C3H,0+' potential energy surface using the G2 procedure. Heat capacity corrections were made to allow the direct calculation of heats of formation at 1298 K. The most stable isomer is the methylketene radical cation (1, AH, 2
Semi-empirical UNDO methods predict that 2 of 23 structurally distinct C6& isomers and 4 of 143 C7uH2 isomers have particularly low heats of formation. These isomers represent either 1 ,t-addition across a 6: 6-ring fusion or 1,4-addition across a ii-ring, with both hydrogens externally bound. Fully
## Abstract Quantum Monte Carlo and a series of other ab initio as well as density functional theory calculations were performed for the enthalpy of formation of C~4~H~3~ and C~4~H~5~ radicals. The computed Ξ~f~H~298~^0^ values, in kcal/mol, are 126.0 for __n__βC~4~H~3~, 119.4 for __i__βC~4~H~3~, 8