F. Barbot

Addition reversible de l'organozincique CH2=CH-CH2ZnBr sur une cetone et sur un aldehyde

Abstract Under suitable conditions, the reaction of allylzinc bromide with a carbonyl compound can be reversible.

1,4-Addition of grignard reagents and 1,6-addition of lithium organocuprates to n,n-diethylsorbamide

Abstract When they react with N,N-diethylsorbamide, saturated and allylic Grignard reagents give γ,δ-ethylenic amides (1,4-addition) whereas saturated and allylic lithium organocuprates give β,γ-ethylenic amides (1,6-addition).

Etude de l'action d'organometalliques sur la cetone CH3COCHCHCHCHCH3. Application a la preparation de cetones β-ethyleniques a partir d'organocuprates lithiens

Abstract Lithium organocuprates, R 2 CuLi, react with the ketone CH 3 COCHCHCH CHCH 3 to give the β-ethylenic ketones CH 3 COCH 2 CHCHCH(R)CH 3 corresponding to an 1–6 addition reaction.

Action d'organoaluminiques α-insatures sur les acetals et les cetals

Abstract α-Unsaturated organoaluminium compounds react easily in ether with acetals and ketals to give the β-unsaturated ethers corresponding to the substitution of one alkoxy group.

Sur la reactivite des organomagnesiens derivant de l'addition d'organomagnesiens allyliques sur l'isoprene

Abstract Contrary to a recent report, it is shown that allylic Grignard reagents prepared by treating allylic Grignard reagents with isoprene and a catalytic amount of Cp2TiCl2 react normally with carbon dioxide and carbonyl compounds: a complete allylic rearrangement is observed.

Réactivité d'organozinciques α-insaturés vis à vis de N-(phénylsulfanyl) iminoesters application à la synthèse d' α-aminoacides insaturés, mono- ou disubstitués

Abstract A new general synthesis of C-subtituted α -aminoacids is described, using at first the regioselective reaction between α -unsaturated organozincs and N -(phenylsulfanyl)iminoesters.

Addition en 1,8 d'organocuprates lithiens saturés sur la cétone CH3 (CHCH)3COCH3 et sur l'ester CH3(CHCH)3COOC2H5

Abstract The reaction of saturated lithium organocuprates with the trienic ketone CH 3 (CHCH) 3 COCH 3 and with the trienic ester CH 3 (CHCH) 3 COOC 2 H 5 proceeds by a 1,8 conjugate addition to give a β,δ-diethylenic carboynl compound.

Etude de la fixation du groupe tertiaire gem-diméthylpropynyle HCCC(CH3)2 par voie organométallique; applications

Organometallics (CH3)2CCCHM (M  MgBr, Al23Br, ZnBr) are easily prepared from the tertiary bromide (CH3)2C(Br)CCH. They often react to give only acetylenic products but, with some reagents, a mixture of acetylenic and allenic compounds is obtained.

A novel route to substituted phosphonates via conjugate addition of organometallics to 1-(functionally)substituted alkene phosphonates

Abstract Organometallics readily add to the double bond of 1-(functionally substituted alkene phosphonates to give highly substituted phosphonates.

N-tosyl iminoethers et iminocarbonates d'alkyle : Synthons d'amines primaires a structure ramifiee

Resume Allylic organometallics react with N-tosyl iminoethers and N-tosyl iminocarbonates to produce sulfonamides which give the title amino compounds by reaction with sodium in liquid ammonia.