ESR evidence for the formation of the trimethylene padical cation -CH2CH2CH+ from cyclopropane
β Scribed by Xue-Zhi Qin; Ffrancon Williams
- Publisher
- Elsevier Science
- Year
- 1984
- Tongue
- English
- Weight
- 487 KB
- Volume
- 112
- Category
- Article
- ISSN
- 0009-2614
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β¦ Synopsis
Solid-state ESR studies show that the cyclopropane radical cation undergoes ring opening in the CFC12CFzQ mat&i above 80 I(. The two terminal CH, groups in the derived trimethylene radical cation are perpendicular to each other such that the electron spin is confined to one end of the molecule. the radical centre adoptins a bisected conformation very similar to that of the n-propyl radical.
π SIMILAR VOLUMES
It is concluded that C3H80+' formed by dissociation of ionized 2ethoxyethanol ( ) is a mixture of CH,CH,OCHl' (7) and 'GH,+OHCH,CH, (2). Formation of 7 and CH3CH2+0HCH3 ( ) is attributed to dissociations of species formed by the hydrogen transfers [ CH,CH20CH2+ 'CH,OHI + [CH,CH,OCHi' CH,Ol -+ [CH,CH
The distonic radical ion 'CH,CH,SCH,' (l"), generated by dissociative electron ionization of 1,4-dithiane or 1,4-thioxane, is identified in the gas phase by its collisionally activated dissociation (CAD), neutralizationreionization ('NR' ) and charge-reversal ('CR-) mass spectra. The unimolecular ch
measuring the relative CO qilantum yields from kctenc photolysis as a function of photolysis wavelength WC have determined the threshold energy at X0 for C112CO('AI) -+CHH(33~i) + CO(t -+ \, ) to be 75.7 + 1.0 kcal/mole. This corrc-SpOl'ldS to a VdlC Of 40.7 f 1.0 kcal/molc for &Hpzss[ C112(3B,)]. B