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Lewis base dependent (3+3) annulations of β′/δ‐acetoxy allenoates with iminoindolines offer α‐carbolines with varying substituents depending on the base used as well as subtle changes in the reaction conditions. The phosphine‐catalyzed annulation of δ‐acetoxy allenoates with iminoindolines involves 6‐exo‐trig cyclization, tosyl anion elimination/trapping, and ethyl acetate elimination as key steps...
Photonic crystal fiber (PCFs) are the branch of silica based optical fiber where vent to pass the air are dig into the outer region of core and these seem to be moving ahead in the direction of axis of the parent fiber .PCF have been in acquaintance since the days when research in the region of light source based on silica was on the high. Crystal fibers are available in various architectures as to...
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