SA Ahmed - Journal of physical organic chemistry, 2006 - Wiley Online Library
Novel photochromic bis‐styryl dihydroindolizines (DHIs) 5a‐β bearing different cycloalkanone ring sizes were prepared in 11–42% yield via nucleophilic addition of bis …
SAM Ahmed - Journal of Physical Organic Chemistry, 2002 - Wiley Online Library
Abstract Twenty‐nine new photochromic 2, 4, 7‐substituted fluorene‐9′‐ styrylquinolinedihydroindolizines (DHIs) 4a–χ were prepared in 45–75% yield via …
SA Ahmed, ZA Hozien, AMA Abdel-Wahab… - Tetrahedron, 2011 - Elsevier
In this work, photochromic materials based on the dihydroindolizine (DHI) system were synthesized in multistep reactions using chemical and photochemical methods. Some of the …
SA Ahmed - Monatshefte für Chemie/Chemical Monthly, 2004 - Springer
Ten novel photochromic dihydroindolizines (DHI s) based on 1, 5-electrocyclization and bearing a cholesteryl moiety at 7′-position of the DHI skeleton were synthesized. 1D, 2D …
SAM Ahmed, JL Pozzo - Journal of Photochemistry and Photobiology A …, 2008 - Elsevier
Six new photochromic materials 9–11, 13–15 based on photochromic dihydroindolizine (DHI) system covalently linked to ester, acid or sodium N-acyl-11 aminoundecanoate …
Eight new photochromic dihydro 5-azaindolizine-linker-conjugates with a terminal ethylene anchoring group have been synthesized via palladium-catalyzed Negishi coupling …
SA Ahmed, T Hartmann, H Dürr - Journal of Photochemistry and …, 2008 - Elsevier
The photochromic compounds dihydroindolizine (DHI) and tetrahydroindolizines (THIs) containing dicyano and diesters were prepared via nucleophilic addition of the …
SA Ahmed, KS Khairou, BH Asghar, HA Muathen… - Tetrahedron …, 2014 - Elsevier
New carbon-rich photochromic tetrahydroindolizines (THIs) bearing dihydroisoquinoline derivatives as heterocyclic bases (region B) have been synthesized via different chemical …
In the present study, the thermal 1, 5-electrocyclization back reaction from betaines (colored forms) to dihydroindolizines (DHIs, colorless) was studied in seven organic solvents with …