72235-68-8Relevant articles and documents
Kinetics of hydrogen atom transfer from (η5-C 5H5)Cr(CO)3H to various olefins: Influence of olefin structure
Choi, Jongwook,Tang, Lihao,Norton, Jack R.
, p. 234 - 240 (2007/10/03)
Treating (η5-C5H5)Cr(CO)3H (1) or (η5-C5H5)Cr(CO)3D (1-d1) with an excess of olefin containing the opposite isotope generally leads to H/D exchange, althoug
Unusual Fragmentation of 1,1,2,2,3,3-Hexamethylindan. Methyl Group Equilibration and Multi-step Skeletal Rearrangements in the (1+) Ions Prior to the Formation of t-C4H9(1+) Other Fragment Ions
Kuck, Dietmar,Mehdizadeh, Ahmad
, p. 443 - 452 (2007/10/02)
Based on the surprising observation of an intense C4H9(1+) (m/z 57) peak in the electron impact mass spectrum, the fragmentation of 1,1,2,2,3,3-hexamethylindan (2) was studied by mass-analysed ion kinetic energy spectrometry of its deuterium-labelled analogues.While methyl loss from ions (1+). occurs with high selectivity (92percent) from the positions 1 and 3 without any rearrangement, ions (1+) undergo complete equilibration of the five methyl groups as intact entities.Subsequent multi-step skeletal rearrangement of the (1+) ions leads to formation of tert-butyl ions and to the loss of isobutene and propene, again without concomitant hydrogen exchange.Several kinetic isotope effects and also probably a thermodynamic isotope effect associated with each of these fragmentation processes have been found and their origin is discussed.The possibility of the formation of ion-neutral complexes and is considered on the basis of the labelling and reactivity pattern.
Photoaddition of Alkenes to N-Methyl-1,8-naphthalimide in Methanol. Evidence for the Mechanism of the Formation of the Tetracyclic Adducts.
Somich, Cathleen,Mazzocchi, Paul H.,Ammon, Herman L.
, p. 3614 - 3619 (2007/10/02)
Irradiation of N-methyl-1,8-naphthalimide (NMN) in the presence of α-methylstyrene (α-MS) or 1,1-diphenylethylene in methanol gives novel tetracyclic imides.The mechanism proposed involves photostimulated electron transfer from the alkene to 1,8-NMN and radical coupling addition of methanol to the resultant radical cation-radical anion pair at the 4-position of the aromatic ring to give an unisolable intermediate with an α,β-unsaturated carbonyl moiety.Absorption of a second photon by this chromophore gives rise to the final product.The predicted regiochemistry and stereochemistry of the reaction were established by using pentadeuterio-α-methylstyrene (16), thus providing strong evidence for the mechanism.