Ortho-Chlorostyrene

Chlorobenzylidene malononitrile has the military designation CS. It is also known as (3,(3-dicyano-ortho-chlorostyrene, 2-chlorophenyhnethylenepropanedinitrile, and o-chlorobenzahnalononitrile. CS is a white solid with a molar mass of 188.5 corresponding to a molecular formula of CjoHjNjCl. The molar solubility in water at 20°C... 

Synonyms/Trade Names 2-Chlorostyrene, ortho-Chlorostyrene, 1-Chloro-2-ethenylbenzene... 

Mo(CO)6 has also been used in other types of microwave-promoted carbonylative chemistry. In 2005, Larhed and coworkers presented a carbonylative cyclization protocol whereby ortho-bromo- and ortho-chlorostyrenes were converted into indan-1-ones [21]. Optimized reaction conditions for o-Br-styrenes involved Pd(OAc)2 and 2 as catalytic system with Mo(CO)6 as CO source, n-Bu4NCl as additive and pyridine as base in 1,4-dioxane. Microwave-heating at 150 °C for 30 min provided indanones in 59-82% yield (Scheme 4.5) [21]. 

Chlorob Tizyliclene) malononitrile (ortho-Chlorobenzal)malononitrile 2-<Chloro-phenyl)melhylenemalorK)nitrile (2-Chlorophenyl)methylenepropane[Pg.158]

The temperature and intensity of the p peak scarcely change on going from H, F, Cl, Br to I in Illers data. However, the data of Boyer and Turley [10] for three isomers of poly(chlorostyrene) show that the p relaxation intensity decreases on going from para to ortho substituents. Gao and Harmon [6] analysed the methyl and tert-butyl para sustituent effect on the P relaxation in PS. Small modifications of the peak position were observed and the P-activation energy was the same as obtained for PS... 

The regioselective metalation of arenes at a position neighboring a heterosubstituent has been mentioned above. Deviations from the ortho rule do exist but are scarce. The metal can nevertheless be systematically directed to meta or para positions if one resorts to the deployment of protective groups or similar stratagems. Organometallics enable regiocontrol also in the alkenyl series. The addition of bromine onto the double bond of co-chlorostyrene and subsequent base-mediated... 

In order to study a polymer system by dielectric relaxation, the polymer must possess a net dipole moment, either along the chain, or through polar side groups. Successful studies of and T>Tg transitions have been carried out in our laboratory on poly(propytene oxide) oligomers, copolymers of ortho- and para-chlorostyrene, cellulose acetate and cellulose acetate butyrate copolymers,and random copolymers of styrene acrylonitrile. ... 

T>Tg loss processes in addition to the strong Tg process at all three test frequencies. Varadarajan et al. have used van Tumhout s derivative treatment successfully in their dielectric studies of polyCpropylene oxide) oligomers and copolymers oi ortho- and para-chlorostyrene, ... 

---