Detail of "98-58-8"

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CAS Number:
98-58-8
Name:
4-Bromobenzenesulfonyl chloride
Molecular Structure:
Formula:
C₆H₄BrClO₂S
Molecular Weight:
255.52
Synonyms:
NSC 4506;UNII-C6347T8FP1;p-Bromobenzenesulfonyl chloride;p-Bromophenylsulfonyl chloride;
EINECS:
202-683-2
Density:
1.795 g/cm³
Melting Point:
74 °C
Boiling Point:
287.2 °C at 760 mmHg
Flash Point:
127.5 °C
Solubility:
decomposes with water
Appearance:
white to beige crystals or crystalline powder
Hazard Symbols:
C
Risk Codes:
34
Safety:
26-36/37/39-45 Details
Transport Information:
UN 3261 8/PG 2

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Ionic reactions in bicyclic systems: Ionic reactions in bicyclic systems. 10. The effect of 6,7-dimethoxy substituents on rates of solvolysis in secondary and tertiary 2-benzonorbornenyl systems. Goering, Harlan L.; Chang, David C. K.; Chang, Wei-Shing (Dep. Chem., Univ. 840-89-1 and 98-58-8 are cas registry numbers. These chemicals are also mentioned in this article. Wisconsin, Madison, Wis., USA). J. Org. Chem., 42(7), 1145-9 (English) 1977. CODEN: JOCEAH. DOCUMENT TYPE: Journal CA Section: 22 (Physical Organic Chemistry) The effect of the 6,7-di-MeO substituents on the solvolysis rate of I (R = p-BrC6H4SO3, R1 = H, R2 = R3 = MeO) (II) and I (R = H, R1 = p-BrC6H4SO3, R2 = R3 = MeO) (III) was the same as that of the 6-MeO group. The rate of acetolyis of II was 204 times larger than that of I (R = p-BrC6H4SO3, R1 = R2 = R3 = H) at 25.degree.. The solvolysis rate of I (R = p-O2NC6H4CO2, R1 = Me, R2 = R3 = MeO) (IV) was 17 times larger than that for I (R = p-O2NC6H4CO2, R1 = Me, R2 = R3 = H) (V) in 90% aq. Me2CO at 100.degree.. Ion-pair return (detd. by the rate of carboxyl O atom equilibration) was more important for IV than for V as the ionization rates differed by .apprx.40 while the solvolysis rates differed by 16.6. The acetolysis rates of VI, III, and I (R1 = p-BrC6H4SO3, R = R2 = R3 = H) span a range of >260 at 100.degree.; the solvolysis stereochem. of the optically active endo brosylates are similar giving the exo-acetates with 94-6% loss of optical activity. .

Rate and product analytical study of the solvolysis of 3-chlorobenzyl arenesulfonates in aqueous 2,2,2-trifluoroethanol: Rate and product analytical study of the solvolysis of 3-chlorobenzyl arenesulfonates in aqueous 2,2,2-trifluoroethanol. Gordon, Isobel M.; Maskill, H. (Chem. Dep., Univ. Sitrling, Stirling FK9 4AU, UK). J. Chem. Soc., Perkin Trans. 2, (12), 1951-3 (English) 1991. CODEN: JCPKBH. ISSN: 0300-9580. DOCUMENT TYPE: Journal CA Section: 22 (Physical Organic Chemistry) The rates of solvolysis of 3-chlorobenzyl 4-methyl-, 4-methoxy-, and 4-bromobenzenesulfonates at different temps. in 1:1 (vol./vol.) 2,2,2-trifluoroethanol-water have been measured and the activation parameters detd. Qual., the rate consts. show the expected dependence upon the substituent in the benzenesulfonate leaving group, and the toluenesulfonate is 42 times less reactive (at 25°) than benzyl toluenesulfonate itself. In the product study, the ratio of the 3-chlorobenzyl alc. to the 3-chlorobenzyl trifluoroethyl ether was independent of the nucleofuge.In this experiment, several chemicals are used like 98-58-8 and 873-63-2 Introduction of the 3-chloro substituent into the electrophile, however, causes the selectivity for water as opposed to trifluoroethanol to be increased by ca. 50%. The results are discussed in terms of a substitution reaction which is concerted but not synchronous, a solvent-induced, largely uncoupled SN2 mechanism. .