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Allenylidene reactions with thiols

It is noteworthy that the addition of thiols to form propargylic sulfides is not catalysed by the neutral complex [Cp RuCl(p2-SR)2RuCl(Cp )], but requires the utilization of a cationic precursor such as [Cp RuCl(p2-SMe)2Ru(Cp )(H20)]0Tf [85]. With this catalytic system,propargylic alcohols bearing an internal triple bond are also transformed into propargylic sulfides, which indicates that in this special case, the reaction does not involve a ruthenium allenylidene as an active species. [Pg.146]

Besides Selegue s methodology, several synthetic alternatives of ruthenium allenylidene complexes have been reported. The most popular involves trapping of transient butatrienylidene or pentatetraenylidene intermediates with nucleophiles [26-29]. Although alcohols, amines, or thiols have been usually employed in these reactions leading to the corresponding heteroatom-substituted allenylidenes, in some cases the use of carbon-centred nucleophiles, such as pyrroles, has been described [185, 186]. Quite recently, a systematic route to prepare sequentially polyalkenyl-allenylidene complexes has also been discovered (Scheme 11) [187— 189]. The first step consists of the insertion of the ynamine MeC=CNEt2 into the... [Pg.163]


See other pages where Allenylidene reactions with thiols is mentioned: [Pg.210]    [Pg.213]    [Pg.163]    [Pg.226]    [Pg.226]    [Pg.112]    [Pg.389]   
See also in sourсe #XX -- [ Pg.219 ]




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Allenylidene reactions

Allenylidenes

Reaction with thiols

Thiol Reactions

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