2- propanedinitrile

Thus, the lithiated SAMP hydrazones of various methyl ketones on addition to 2-(aryl-methylene)- , 3-propanedionates and propanedinitriles provide, after the removal of the auxiliary, (R)-2-( l-aryl-3-oxobutyl)-1,3-propanedioates and -propanedinitriles with high enantiomeric excess (> 95%) in 50 82% yield (sec Table 6) 195,197. Using similar methods optically active (5-lactones (90% to > 96% ee) are obtained198. 

Figure 8.5 Conversion of 2-(l,3-benzodioxol-5-ylmethyl)-2-methyl-propanedinitrile to (R)-ot-(aminocarbonyl)-o -methyl-1,3-benzodioxole-5-propanoic acid using the non-enantiotopic NHase activity...

Dicyanoheptafulvene 2,4,6-Cycloheptatriene-A1 -malononitrile (8) Propanedinitrile, 2,4,6-cycloheptatrien-1-ylidene- (9) (2860-54-0) Cycloheptatrienylium tetrafluoroborate Aldrich Tropylium tetrafluoroborate Cycloheptatrienylium, tetrafluoroborate (1-) (8,9) (27081-10-3) Bromomalononitrile, Malononitrile, bromo- (8) Propanedinitrile, bromo- (8) (1885-22-9)... 

Pyridinium tetrafluoroborate Pyridine, tetrafluoroborate (1-) (8,9) (505-07-7) Malononitrile Highly Toxic (8) Propanedinitrile (9) (109-77-3)... 

Synonyms Alonitrile BRN 1866635 CCRIS 2377 2-Chlorobenzalmalononitrile o-Chloro-benzalmalononitrile 2-Chlorobenzylidenemalononitrile 2-Chlorobnm [(2-Chlorophenyl)meth-ylene]propanedinitrile CS p,p-Dicyano-o-chlorostyrene EINECS 220-278-9 NCI-C55118 NSC 542 TL 238 OCBM USAF KF-11. 

Chloro-l-phenylethanone, see a-Chloroacetophenone 4-Chlorophenyl ether, see 4-Chlorophenyl phenyl ether p-Chlorophenyl ether, see 4-Chlorophenyl phenyl ether Chlorophenylmethane, see Benzyl chloride [(2-Chlorophenyl)methylene]propanedinitrile, see o-... 

Solvent polarization can also play a role in the stabilization of conformationally nonuniform particles. For example, 4-(l-phenylpiperidin-4-ylidene) cyclohexylidene propanedinitrile transforms into completely charge-separated species on photoirradiation. This species contains the C=C bond and bears two ion-radical centers N and C. As explained (Floogesteger et al. 2000), the species formed keeps a folded conformation in cyclohexane and a stretched conformation in benzene. 

CYCLOHEXADIENE-1,4-DIYLIDENE)BIS[PROPANEDINITRILE] RADICAL ANION(l-)] (TETRATHIAFULVALENIUM-TETRACYANOQUINO-DIMETHANIDE), [(TTF)(TCNQ)]... 

CS gas Propanedinitrile [(2-chlorophenyl) methylene] tear gas used for riot and crowd control. 

It is interesting to note the difference in regiochemistry of the reaction of 18 with 2-[bis(triflu-oromcthyl)methylene]propanedinitrile. Evidence for diradical intermediates was obtained from trapping experiments with benzenethiol.12... 

Nucleophilic allenes react readily with electron-deficient alkenes giving cyclobutanes. Thus, instant cycloaddition occurs between methoxyallene (26) and 2-[bis(trifluoromethyl)methylene]-propanedinitrile.21... 

A variety of nucleophilic agents can be used propanedinitrile, 3-oxo-butanoate esters, and cyanoethanoate esters all form relatively stable car-banions and function well in Michael addition reactions. Obviously, if the carbanion is too stable, it will have little or no tendency to attack the double bond of the a./8-unsaturated acid derivative. The utility of the Michael addition for preparing 1,5-dicarbonyl compounds is illustrated by the examples in Exercise 18-49. 

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