Photochromic Spirotetrahydroazafluorenes: Part IV. First Trapping of Novel Type of <i>cis</i>-Fixed Photochromes Based on Pyridazinopyrrolo[1,2-b]isoquinoline
作者:Saleh Abdel-Mgeed Ahmed
DOI:10.1080/15421400590946532
日期:2005.5.1
2a–g to diacetyl spirocyclopropene 1 in dry ether at − 20°C under nitrogen atmosphere for 3 h, which undergo ring opening the corresponding betaines 3′′′a–g through betaine 3′a–g and 3″a–g as intermediates after irradiation with UV-light. The serious decomposition of these products during purification process was moderately prevented by using flash chromatography after many trials. In situ hydrazinolysis