Stable selenoxanthenium ylides : synthesis and new reductive cyclization of selenoxanthen-10-10(alkoxalyl alkoxycarbonyl)methanides and their related compounds
作者:Tadashi Kataoka、Kiminori Tomimatsu、Hiroshi Shimizu、Mikio Hori
DOI:10.1016/s0040-4039(00)81331-3
日期:1983.1
alkoxycarbonyl)methanides were prepared from the corresponding selenoxides and activated acetylenes. In the reaction of 9-phenylselenoxanthene 10-oxide() with methyl propiolate afforded an unexpected product, methyl 9-phenylselenoxanthen-9-ylpropiolate() together with ylide(). The selenonium ylides underwent new reductive cyclization with sodium borohydride to afford new cyclicselenonium ylides.
Levy, Amalia; Biedermann, P. Ulrich; Cohen, Shmuel, Journal of the Chemical Society. Perkin Transactions 2 (2001), 2000, # 4, p. 725 - 735
作者:Levy, Amalia、Biedermann, P. Ulrich、Cohen, Shmuel、Agranat, Israel
DOI:——
日期:——
Zinc-mediated reductive dimerizations of telluroxanthone and selenoxanthone. Tellurium–selenium selectivity
作者:Amalia Levy、Israel Agranat
DOI:10.1016/s0040-4039(00)00997-7
日期:2000.8
Reductive dimerizations of 9H-selenoxanthen-9-one (3) and 9H-telluroxanthen-9-one (4) (1:1) with zinc in boiling AcOH and HCl for 1 hour gave the bistricyclic ethanes 9,9'-bi(9H-selenoxanthene (10), 9,9'-bi(9H-telluroxanthene) (11) and 9-(9'H-telluroxanthen-9'-yl)-9H-selenoxanthene (12) in the ratios 21 (10):35 (11):44 (12) (in addition to 9H-selenoxanthene (13) and 9H-telluroxanthene (14)). Analogous reactions of 4 and 9H-thioxanthen-9-one (9) (1:1) and 3 and 9 (1:1) gave the corresponding bistricyclic ethanes. The reactions were chalcogen selective with a preference towards the tellurium-bridged bistricyclic ethanes. (C) 2000 Elsevier Science Ltd. All rights reserved.