Cycloaddition reactions of (eta(6)-tropone) tricarbonylmetal(0) complexes of group 6 metals with alkynes
Küçük Resim Yok
Tarih
2002
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Inst Organic Chem And Biochem
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
(eta(6)-Cyclohepta-2,4,6-trien-1-one) tricarbonylmetal(0) complexes of chromium (2a), molybdenum (2b), and tungsten (2c) are formed when tris( acetonitrile) tricarbonylchromium(0), mo-lybdenum(0), and tungsten(0), respectively, are treated photochemically with tropone (cyclohepta-2,4,6-trien-1-one) 1. UV photolysis of 2a-2c and RCequivalent toCR' (R=R'=Ph, Me3Si, Et; R=Ph, R'=Me3Si) in toluene gives the [6+2] cycloadducts, (eta(4), eta(2)-8,9-diphenylbicyclo-[4.2.1] nona-3,5,8-trien-1-one) tricarbonylmetal(0) 3a-3c,(eta(4), eta(2)-8,9-bis(trimethylsilyl) bicyclo[4.2.1] nona-3,5,8-trien-1-one) tricarbonylmetal(0) 4a-4c,(eta(4), eta(2)-8,9-diethylbicyclo[4.2.1] nona-3, 5,8-trien-1-one) tricarbonylmetal(0) 5a-5c, and (eta(4), eta(2)-8-phenyl-9-(trimethylsilyl) bicyclo-[4.2.1] nona-3,5,8-trien-1-one) tricarbonylmetal(0) 6a-6c. Compounds 2a-2c, 3a-3c, 4a-4c, 5a-5c, and 6a-6c were purified by chromatography, recrystallized and isolated as analytically pure crystalline solids in moderate yields and characterized by mass, IR, and NMR spectroscopy. Pure organic heterobicyclotriene ligands 7a, 8a, 9a, and 10a were isolated from 3a, 4a, 5a, and 6a, respectively, by treatment with cerium(IV) ammonium nitrate (R=R'=Me3Si; R=Ph, R=Me3Si) or by heating in toluene (R=R'=Ph, Et). It was not possible to isolate the bicyclic complexes resulting from the reactions of 2a-2c with terminal alkynes like phenylacetylene.
Açıklama
Anahtar Kelimeler
Tropone, [6+2] Cycloadditions, Chromium Complexes, Photochemical Synthesis, Molybdenum Complexes, Alkynes, Bicyclo[4.2.1]Nona-3,5,8-Trien-1-Ones
Kaynak
Collection Of Czechoslovak Chemical Communications
WoS Q Değeri
Q2
Scopus Q Değeri
N/A
Cilt
67
Sayı
11
