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Girard reagents

Girard Reagent T (2-hydrazino-N,N,N-trimethyi-2-oxo-ethanaminium chioride) [123-46-6] M 167.6, m 192 . Should be crystd from absolute EtOH (slight decomposition) when it has a slight odour, and stored in tightly stoppered containers because it is hygroscopic. [Pg.251]

A " -3-Ketones do not react with Girard reagents under mild conditions and thus can be separated from other reactive ketones. [Pg.395]

Enol esterification with acetyl chloride-acetic anhydride gives the A -trien-3-acetate, but reaction with isopropenyl acetate or with hot acetic anhydride-pyridine gives A " -trien-3-acetates. " Since A"" -3-ketones react with Girard reagents, these linear dienones can be separated from A ""-3-ketones. ... [Pg.395]

Decarboxylation can also be effected by reaction of the A - or A -3-keto-19-acid with Girard Reagent. ... [Pg.275]

The imine is exchanged away with Girard reagent T to give... [Pg.219]

Carboxymethyl)trimethylammonium chloride hydrazide see Girard reagent T. [Pg.137]

Girard Reagent T [123-46-6] M 167.6, m 192 . Crystd from absolute EtOH. [Pg.228]

Girard reagent T 0 (CH3)3N—Cl—ch2cnhnh2 Useful for derivatization of saturated aldehydes... [Pg.104]

Reference Standards. Reference standards for TLC, GC, and MS were obtained as follows. Pure abietic acid (mp 172-173 °C) was used as received. Dehydroabietic acid was prepared by oxidation of abietic acid with selenium dioxide to hydroxy abietic acid and subsequent dehydration with glacial acetic acid (11). 7-Ketodehydroabietic acid was prepared by oxidation of dehydroabietic acid with potassium permanganate and isolation of the product by way of the Girard reagent T (12). Pyroabietic acid (a mixture of dehydro- and dihydroabietic acids) was prepared by heating abietic acid with 10% palladium on charcoal to 250 °C for 1 h (13). [Pg.366]

The reagent is analogous to Girard reagents T and P and is prepared in the same way and used for isolation of a ketone from a mixture by conversion to a derivative extractible from ether with dilute hydrochloric acid. It is stated to be more easily purified than reagents T and P. [Pg.878]


See other pages where Girard reagents is mentioned: [Pg.976]    [Pg.323]    [Pg.262]    [Pg.298]    [Pg.299]    [Pg.976]    [Pg.181]    [Pg.323]    [Pg.557]    [Pg.560]    [Pg.976]    [Pg.467]    [Pg.403]    [Pg.323]    [Pg.157]    [Pg.397]    [Pg.434]    [Pg.36]    [Pg.403]    [Pg.434]    [Pg.586]    [Pg.323]    [Pg.446]    [Pg.208]    [Pg.208]    [Pg.208]    [Pg.976]    [Pg.43]    [Pg.117]    [Pg.193]   
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See also in sourсe #XX -- [ Pg.606 ]

See also in sourсe #XX -- [ Pg.31 , Pg.106 ]

See also in sourсe #XX -- [ Pg.16 , Pg.18 , Pg.133 , Pg.757 ]

See also in sourсe #XX -- [ Pg.31 , Pg.106 ]

See also in sourсe #XX -- [ Pg.15 , Pg.435 ]

See also in sourсe #XX -- [ Pg.242 ]

See also in sourсe #XX -- [ Pg.16 ]




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