## Abstract Ethyl 2‐cyano‐3‐methyl‐4‐phenyl‐2‐pentenoate was obtained as a mixture of two geometric isomers. An aromatic solvent induced shift experiment and calculations of the difference in the chemical shifts of methyl protons linked to the double bond lead to the assignation of the geometry of
Isomeric structures of protonated ozone: A theoretical study
✍ Scribed by Michael Kausch; Paul Von Ragué Schleyer
- Publisher
- John Wiley and Sons
- Year
- 1980
- Tongue
- English
- Weight
- 407 KB
- Volume
- 1
- Category
- Article
- ISSN
- 0192-8651
No coin nor oath required. For personal study only.
✦ Synopsis
Ab initio molecular orbital calculations have been used to determine the structure of protonated ozone. Four stable minima were found on the 03H+ singlet potential energy surface. Three forms correspond to ozone protonated at the central oxygen ((22") or at the terminal oxygen (two C, isomers, E and 2). The fourth isomer (C,) is a derivative of trioxirane. The most stable structure is the planar E form I. The proton affinity of ozone (to give I) is given as 123.6 kcal/mole (MP2/6-31G*//4-31G). The energy difference between I and protonated trioxirane VI is greater than that between ozone and trioxirane.
📜 SIMILAR VOLUMES
## Abstract The vicinal coupling constant, __J__(12), between the vinyl CH and the ring CH protons in vinylcyclohexane was calculated from a ‘partial molecule’ six‐spin system. The 100 and 270 MHz results are in good agreement; those at 60 MHz were, however, still inaccurate in this approximation.
## Abstract The structures and isomerization of silylenoid (Tsi)Cl~2~SiLi (Tsi = C(SiMe~3~)~3~) were studied by density functional theory (DFT) at the B3LYP/6‐31G(d) level. Four equilibrium structures and three isomeric transition states were located. The three‐membered ring and __p__‐complex struc