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Alkynyl phosphines, rearrangement

Primary ethyn-l-yl phosphines (26) rearrange readily under mild conditions in the presence of a Lewis base such as EtsN to yield phosphaalkynes (27). The reaction probably takes place via the phosphaallene. Other rearrangements of alkynyl phosphines to phosphaallenes have been reported . ... [Pg.493]

Intramolecular rearrangement of 2-alkynyl phosphites or phosphinites gives allenyl phospho-nates or phosphine oxides, respectively, and in most cases proceeds with high stereoselectivity (cf. Houben-Weyl, Vol. E2, p 19). [Pg.1213]

Thus, l-alkynyl-2-methylcyclopentanols react with chlorodiphcnylphosphine in the presence of base to give transient phosphinites, which rearrange stereoselectively to allenyl phosphine oxides I24... [Pg.1213]

The formation of alkynephosphonic diesters through the isomerization of alkynyl phos-phorus(III) esters and subsequent prototropic rearrangement of the propadienylphos-phonic acid derivatives has already been discussed. An early listing of alkynyl-phosphonic and -phosphinic acid derivatives (and also related types of organophosphorus compounds) is available ... [Pg.97]

A nondissociative mechanism was also claimed for ci5-[(PPh3)2Pt(vinyl)-(alkynyl)]. The unusual rearrangement reaction (8) proceeds by initial dissociation of phosphine.A formal jS-methyl elimination must occur here, but the... [Pg.272]

See other pages where Alkynyl phosphines, rearrangement is mentioned: [Pg.4108]    [Pg.1]    [Pg.4107]    [Pg.485]    [Pg.493]    [Pg.184]    [Pg.77]    [Pg.145]    [Pg.89]    [Pg.31]    [Pg.17]    [Pg.474]    [Pg.181]    [Pg.186]    [Pg.191]    [Pg.475]    [Pg.233]    [Pg.570]    [Pg.332]    [Pg.19]    [Pg.354]   
See also in sourсe #XX -- [ Pg.493 ]



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