Arylmethyl Radicals from Arylmethoxybromodiazirines
作者:Robert A. Moss、Xiaolin Fu
DOI:10.1021/ol0400443
日期:2004.9.1
Photolytic decompositions of 3-arylmethoxy-3-bromodiazirines afford arylmethyl radicals by homolyses of the diazirines' excited states.
Reactions of Diazirines with Aluminum Chloride: Lewis Acid-Mediated Carbene Generation and Friedel−Crafts Reactions
作者:Robert A. Moss、Jean-Marie Fedé、Shunqi Yan
DOI:10.1021/ja002174m
日期:2000.10.1
A Duality of Mechanisms for the Fragmentation of Substituted Benzyloxychlorocarbenes
作者:Robert A. Moss、Yan Ma、Ronald R. Sauers
DOI:10.1021/ja0207605
日期:2002.11.1
Substituted benzyloxychlorocarbenes (X-PhCH2OCCl) were generated photochemically at 25 degrees C in dichloroethane from appropriate diazirine precursors. Fragmentations of the carbenes produced were determined by laser flash photolysis. The data (X, kfrag in s-1) were: p-Me, 2.6 x 105; p-Ph, 8.3 x 104; H, 6.0 x 104; p-Cl, 5.2 x 104; m-Cl, 1.3 x 105; p-F3C, 2.1 x 106; p-O2N, 6.3 x 106. A Hammett correlation of log kfrag versus sigma+ was parabolic. The curvature was taken to imply the gradual change of the fragmentation mechanism from predominantly heterolytic for X-PhCH2CCl with electron-donating X (with developing positive charge on the benzylic carbon in the transition state) to predominantly homolytic for carbenes with electron-withdrawing X. This idea was supported by computational studies.
Push-pull carbenes: alkoxycyanocarbenes
作者:Robert A. Moss、Tadeusz Zdrojewski、Karsten Krogh-Jespersen、Marek Włostowski、Alexander Matro
DOI:10.1016/0040-4039(91)85003-n
日期:1991.4
Benzyloxycyanocarbene is generated thermally from the corresponding diazirine and readily adds to electron-rich alkenes in accord with theoretical expectations.
MOSS, ROBERT A.;ZDROJEWSKI, TADEUSZ, J. PHYS. ORG. CHEM., 3,(1990) N0, C. 694-696