High order cycloaddition reactions of M(CO)3-coordinated N-cyanoazepine with alkynes; M: Cr, Mo, W
Yükleniyor...
Dosyalar
Tarih
2002
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Tricarbonyl(N -cyanoazepine)metal(0) complexes of chromium (2a), molybdenum (2b) and tungsten (2c) are formed when tricarbonyl-tris(acetonitrile)chromium(0), -molybdenum(0) and -tungsten(0), respectively, are treated photochemically with N-cyanoazepine (1). The resulting complexes are purified. UV photolysis of Cr(CO)3(?6-N-cyanoazepine) (2a) and RC=CR (R: Ph, SiMe3) in toluene gives the [6+2]cycloadducts, tricarbonyl{?4:2-7,8-diphenyl-9- N-cyano-9-azabicyclo[4.2.1]-nona-2,4,7-triene}chromium(0), chromium(0), [(?4:2-C8H6N(CN)(SiMe3)2)Cr(CO)3] (3b). Like 2a-c, these new bicyclic compounds were purified by chromatography, recrystallized and isolated as analytically pure crystalline solids in moderate yields and characterized by mass, IR and NMR spectroscopy. The heterobicyclotrienes (4a,b) are isolated from (3a,b) by treatment with cerium(IV) ammonium nitrate (R=SiMe3 ) or by heating in toluene (R=Ph). © 2002 Published by Elsevier Science B.V.
Açıklama
Anahtar Kelimeler
Carbonyl, Chromium, N-Cyanoazepine
Kaynak
Journal of Organometallic Chemistry
WoS Q Değeri
Q2
Scopus Q Değeri
Q3
Cilt
651
Sayı
1-2
