Sulfonyl halide

Sulfonyl halide groups occur when a sulfonyl functional group is singly bonded to a halogen atom. They have the general formula RSO2X where X is a halogen. The stability of sulfonyl halides decreases in the order fluorides > chlorides > bromides > iodides, all four types being well known. The sulfonyl chlorides and fluorides are of dominant importance in this series.[1][2]

Structure

Sulfonyl halides have tetrahedral sulfur centres attached to two oxygen atoms, an organic radical, and a halide. In a representative example, methanesulfonyl chloride, the S=O, S−C, and S−Cl bond distances are respectively 142.4, 176.3, and 204.6 pm.[3]

Sulfonyl chlorides
General structure of a sulfonic acid chloride

Sulfonic acid chlorides, or sulfonyl chlorides, are a sulfonyl halide with the general formula RSO2Cl. They are generally colourless compounds that are sensitive to water.

Production

Arylsulfonyl chlorides are made industrially in a two-step, one-pot reaction from the arene and chlorosulfuric acid:[4]

C6H6 + HOSO2Cl → C6H5SO3H + HCl
C6H5SO3H + HOSO2Cl → C6H5SO2Cl + H2SO4

The intermediate benzenesulfonic acid can be chlorinated with thionyl chloride as well. Benzenesulfonyl chloride, the most important sulfonyl halide, can also be produced by treating sodium benzenesulfonate with phosphorus pentachlorides.[5]

Phenyldiazonium chloride reacts with sulfur dioxide and hydrochloric acid to give the sulfonyl chloride:

[C6H5N2]Cl + SO2 → C6H5SO2Cl + N2

For alkylsulfonyl chlorides, one synthetic procedure is the Reed reaction:

RH + SO2 + Cl2 → RSO2Cl + HCl

Or by treating with SOCl2

Reactions

An obvious reaction is their tendency to hydrolyse to the corresponding sulfonic acid:

C6H5SO2Cl + H2O → C6H5SO3H + HCl

These compounds react readily with nucleophiles other than water, like alcohols and amines (see Hinsberg reaction). If the nucleophile is an alcohol the product is a sulfonate ester, if it is an amine the product is a sulfonamide. Using sodium sulfite as the nucleophilic reagent, sulfonyl chlorides convert to the sulfonate salts, such as C6H5SO2Na. Chlorosulfonated alkanes are susceptible to crosslinking via reactions with various nucleophiles.[6]

Sulfonyl chlorides readily undergo Friedel–Crafts reactions with arenes giving sulfones, for example:

RSO2Cl + C6H6 → RSO2C6H5 + HCl

The desulfonation of arylsulfonyl chlorides provides a route to aryl chlorides:

ArSO2Cl → ArCl + SO2

1,2,4-Trichlorobenzene is made industrially in this way.

Treatment of alkanesulfonyl chlorides having α-hydrogens with amine bases can give sulfenes, highly unstable species that can be trapped:

RCH2SO2Cl → RCH=SO2

Common sulfonyl chlorides

Chlorosulfonated polyethylene (CSPE) is produced industrially by chlorosulfonation of polyethylene. CSPE is noted for its toughness, hence its use for roofing shingles.[6]

An industrially important derivative is benzenesulfonyl chloride. In the laboratory, useful reagents include tosyl chloride, brosyl chloride, nosyl chloride and mesyl chloride.

Sulfonyl fluorides

Sulfonyl fluorides have the general formula RSO2F. "Most, if not all" industrially synthesized perfluorooctanesulfonyl derivatives, such as PFOS, have the sulfonyl fluoride as their precursor.[7]

In the laboratory, sulfonyl fluorides are used in molecular biology as reactive probes. They specifically react with residues based on serine, threonine, tyrosine, lysine, cysteine, and histidine. The fluorides are more resistant than the corresponding chlorides and are therefore better suited to this task.[8]

Sulfonyl bromides

Sulfonyl bromides have the general formula RSO2Br. In contrast to sulfonyl chlorides, sulfonyl bromides readily undergo light-induced homolysis affording sulfonyl radicals, which can add to alkenes, as illustrated by the use of bromomethanesulfonyl bromide, BrCH2SO2Br in Ramberg–Bäcklund reaction syntheses.[9][10]

Sulfonyl iodides

Sulfonyl iodides, having the general formula RSO2I, are quite light-sensitive. Perfluoroalkanesulfonyl iodides, prepared by reaction between silver perfluoroalkanesulfinates and iodine in dichloromethane at −30 °C, react with alkenes to form the normal adducts, RFSO2CH2CHIR and the adducts resulting from loss of SO2, RFCH2CHIR.[11] Arenesulfonyl iodides, prepared from reaction of arenesulfinates or arenehydrazides with iodine, can be used as initiators to facilitate the synthesis of poly(methyl methacrylate) containing C–I, C–Br and C–Cl chain ends.[12]

In the episode "Encyclopedia Galactica" of his TV series Cosmos: A Personal Voyage, Carl Sagan speculates that some intelligent extraterrestrial beings might have a genetic code based on polyaromatic sulfonyl halides instead of DNA.

References
  1. Kosswig, Kurt (2000). "Sulfonic Acids, Aliphatic". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a25_503.
  2. Drabowicz, J.; Kiełbasiński, P.; Łyżwa, P.; Zając, A.; Mikołajczyk, M. (2008). N. Kambe (ed.). Alkanesulfonyl Halides. Science of Synthesis. 39. pp. 19–38. ISBN 9781588905307.
  3. Hargittai, Magdolna; Hargittai, István (1973). "On the molecular structure of methane sulfonyl chloride as studied by electron diffraction". J. Chem. Phys. 59 (5): 2513. Bibcode:1973JChPh..59.2513H. doi:10.1063/1.1680366.
  4. Lindner, Otto; Rodefeld, Lars. "Benzenesulfonic Acids and Their Derivatives". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a03_507.
  5. Adams, Roger; Marvel, C. S.; Clarke, H. T.; Babcock, G. S.; Murray, T. F. (1921). "Benzenesulfonyl chloride". Organic Syntheses. 1: 21.; Collective Volume, 1, p. 84
  6. Happ, Michael; Duffy, John; Wilson, G. J.; Pask, Stephen D.; Buding, Hartmuth; Ostrowicki, Andreas (2011). "Rubber, 8. Synthesis by Polymer Modification". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.o23_o05.
  7. Lehmler, H. J. (2005). "Synthesis of environmentally relevant fluorinated surfactants—a review". Chemosphere. 58 (11): 1471–1496. Bibcode:2005Chmsp..58.1471L. doi:10.1016/j.chemosphere.2004.11.078. PMID 15694468.
  8. Narayanan, Arjun; Jones, Lyn H. (2015). "Sulfonyl fluorides as privileged warheads in chemical biology". Chemical Science. 6 (5): 2650–2659. doi:10.1039/C5SC00408J. PMC 5489032. PMID 28706662.
  9. Block, E.; Aslam, M. (1993). "A General Synthetic Method for the Preparation of Conjugated Dienes from Olefins using Bromomethanesulfonyl Bromide: 1,2-Dimethylenecyclohexane". Organic Syntheses.; Collective Volume, Coll. Vol. 8, p. 212
  10. Block, E.; Aslam, M.; Eswarakrishnan, V.; Gebreyes, K.; Hutchinson, J.; Iyer, R.; Laffitte, J.-A.; Wall, A. (1986). "α-Haloalkanesulfonyl Bromides in Organic Synthesis. 5. Versatile Reagents for the Synthesis of Conjugated Polyenes, Enones and 1,3-Oxathiole 1,1-Dioxides". J. Am. Chem. Soc. 108 (15): 4568–4580. doi:10.1021/ja00275a051.
  11. Huang, W.-Y.; L.-Q., Hu (1989). "The chemistry of perfluoroalkanesulfonyl iodides". Journal of Fluorine Chemistry. 44 (1): 25–44. doi:10.1016/S0022-1139(00)84369-9.
  12. Percec, V.; Grigoras, C. (2005). "Arenesulfonyl iodides: The third universal class of functional initiators for the metal-catalyzed living radical polymerization of methacrylates and styrenes". Journal of Polymer Science Part A: Polymer Chemistry. 43 (17): 3920–3931. Bibcode:2005JPoSA..43.3920P. doi:10.1002/pola.20860.
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