62172-88-7Relevant academic research and scientific papers
Ionic Pathways in the Photochemistry of Cyclic Sulfite Esters
White, Rick C.,Arney Jr, Benny E.,Perry, Jacob,Thompson, Nathan,Pithan, Phil M.,von Gradowski, Sebastian,Ihmels, Heiko
, p. 1656 - 1659 (2017/03/27)
The photochemistry of cyclic carbonate esters proceeds by the photochemical extrusion of carbon dioxide to give 1, 3-diradicals which produce oxiranes as well as other radical derived species. The corresponding cyclic sulfite esters, upon irradiation, give intermediates that are trapped by alcohols yet generate no oxiranes. These results are consistent with ionic intermediates.
Synthesis and Preliminary Biological Evaluation of 6-O-[11C]-[(methoxymethyl)benzyl]guanines, New Potential PET Breast Cancer Imaging Agents for the DNA Pepair Protein AGT
Liu, Xuan,Zheng, Qi-Huang,Fei, Xiangshu,Wang, Ji-Quan,Ohannesian, David W.,Erickson, Leonard C.,Stone, K. Lee,Hutchins, Gary D.
, p. 641 - 644 (2007/10/03)
Novel radiolabeled O6-benzylguanine derivatives, 6-O-[11C]-[(methoxymethyl)benzyl]guanines ([11C]p-O6-MMBG, 1a; [11C]m-O6-MMBG, 1b; ([11C]o-O6-MMBG, 1c), have been synthesized for evaluation as new potential positron emission tomography (PET) breast cancer imaging agents for DNA repair protein, O6-alkylguanine-DNA alkyltransferase (AGT).
Anellated hemicyanine dyes with large symmetrical solvatochromism of absorption and fluorescence
Hübener, Gerd,Lambacher, Armin,Fromherz, Peter
, p. 7896 - 7902 (2007/10/03)
A novel class of amphiphilic hemicyanine dyes is described where electron-pushing aniline and electron-pulling pyridinium are joined by anellated benzene rings. Enhancing the solvent polarity, the absorption band of these ANNINE dyes is shifted to the blu
Synthesis of radiolabeled O6-benzylguanine derivatives as new potential PET tumor imaging agents for the DNA repair protein O6-alkylguanine-DNA alkyltransferase
Zheng, Qi-Huang,Liu, Xuan,Fei, Xiangshu,Wang, Ji-Quan,Ohannesian, David W.,Erickson, Leonard C.,Stone, K. Lee,Martinez, Tanya D.,Miller, Kathy D.,Hutchins, Gary D.
, p. 1239 - 1252 (2007/10/03)
Novel radiolabeled O6-benzylguanine derivatives, 2-amino-6-O-[11C]-[(methoxymethyl)benzyloxy]-9-benzyl purines ([11C]p-O6AMBP, 1a; [11C]m-O6-AMBP, 1b; [11C]o-O6-AMBP, 1c), have been synthesized for evaluation as new potential positron emission tomography (PET) tumor imaging agents for the DNA repair protein, O6-alkylguanine-DNA alkyltransferase (AGT). The appropriate precursors for radiolabeling were obtained in three steps from starting material 2-amino-6-chloropurine with moderate to excellent chemical yields. Tracers were prepared by O-[11C]methylation of hydroxymethyl precursors using [11C]methyl triflate. Pure target compounds were isolated by solid-phase extraction (SPE) purification procedure in 45-60% radiochemical yields (decay corrected to the end of bombardment), and a synthesis time of 20-25 min. Copyright
Carbenes and the O-H Bond: Hydroxyalkyl-Substituted Arylcarbenes
Kirmse, Wolfgang,Kund, Klaus
, p. 2325 - 2332 (2007/10/02)
carbene (4), phenylcarbene (19), and carbene (30) have been generated by photolysis of tosylhydrazone or diazo precursors in protic solvents.These carbenes give cyclic ethers (7, 18, 33) competitively with insertion into O-H bonds of the solvent.For comparison, the analogous benzyl cations (9, 17, 31) have been generated by solvolysis or dediazoniation.The cations are more sensitive to structural variation than their carbenic counterparts: 9 does not undergo intramolecular nucleophilic substitution, in contrast to 17 and 31.These observations are explicable in terms of high barriers for rotation about aryl-cation bonds, as compared with low barriers for rotation about aryl-carbene bonds.Two major effects of the solvent (ROH) and of the base (RONa) on product formation may be distinguished: (i) protonation of the carbene (or of its precursors) in the more acidic media leads to predominantly cationic processes; (ii) deprotonation of the OH group under strongly basic conditions enhances the nucleophilicity of the oxygen, and also facilitates insertion into the α-C-H bonds of 30.
