Synthesis and Hydrolysis of [Alkenyl(alkoxy)carbene]manganese Complexes: Evidence for a Transient Allylic Intermediate on the Way to α,β-Unsaturated Aldehydes

From Calcium Interaction to Calcium Electrochemical Detection by [(C5H5)Fe(C5H4COCHCHC6H4NEt2)] and Its Two Novel Structurally Characterized Derivatives

“…(C 6 H 5 CHCH)CO(CHCHC 6 H 4 NEt 2 ), MeCOCHCHC 6 H 4 NEt 2 , and CO(CHCHC 6 H 4 NEt 2 ) 2 were prepared according to the general procedure of Olomucki and Le Gall and recrystallized in experimental conditions already described . (C 5 H 5 )Fe(C 5 H 4 CHCHCHO) was prepared according a published procedure 2b…”

Di- and Polymetallic Heteroatom Stabilized (Fischer) Metal Carbene Complexes

“…Chromium carbene 107 reacts with ferrocenylcarbaldehyde under the conditions tuned up by Aumann to prepare α,β-unsaturated carbene complexes 46 to form heterodimetallic monocarbene 108 (Scheme ) 47a. An analogous process using benzaldehyde tricarbonyl chromium gave homodimetallic monocarbene complex 109 47b.…”

“…Chromium carbene 107 reacts with ferrocenylcarbaldehyde under the conditions tuned up by Aumann to prepare α,β-unsaturated carbene complexes 46 to form heterodimetallic monocarbene 108 (Scheme ) 47a. An analogous process using benzaldehyde tricarbonyl chromium gave homodimetallic monocarbene complex 109 47b. Ferrocenylcarbaldehyde and 1,1‘-bis-formylferrocene formed dimetallic carbene complexes 110a,b by reaction with the Mn carbene complex anion 111 ,47c while polyconjugated monocarbenes 112a,b were obtained from 9-ferrocenyl-2,7-dimethylnonatetraenal and complexes 1 and 113 following essentially the Aumann procedure …”

“…This methodology was implemented originally by reacting two equivalents of complex 113 with aromatic dialdehydes 114 and 115 to form bis-carbene complexes 116 and 117 (Scheme ) . Trimetallic bis - carbene 118 was formed when an excess of Mn carbene anion 111 was reacted with 1,1‘-ferrocenedicarbaldehyde 47c.…”

Symmetric and Non-Symmetric Dinuclear Alkenyl-Bridged Carbene Complexes of Chromium and Tungsten

“…Thus, symmetrical bis(carbene) complexes of Groups 6 and 7 metals containing aryl [3,4] and thienyl [5,6] bridges are accessible from dilithiated aromatic precursors by the classic Fischer method. A series of alkenyl-or polyenyl-bridged bis(carbene) complexes have been prepared either by condensation reactions of dialdehydes with the methyl group of (alkoxy)methylcarbene complexes, [7,8,9] or by oxidative coupling of [M]ϭ C(OR)CH 2 Li. [10,11] The synthesis of a symmetrical bis(carbene) complex with an ammonium pentadienide bridge has also been described.…”