Sulfonyl group
Chemical group (>S(=O)2)
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In organosulfur chemistry, a sulfonyl group is either a functional group found primarily in sulfones, or a substituent obtained from a sulfonic acid by the removal of the hydroxyl group, similarly to acyl groups.[1]: 1470–1476
Group
Sulfonyl groups can be written as having the general formula R−S(=O)2−R′, where there are two double bonds between the sulfur and oxygen.[1]: 53 [2]
Sulfonyl groups can be reduced to the sulfide with diisobutylaluminium hydride (DIBALH). Lithium aluminium hydride (LiAlH4) reduces some but not all sulfones to sulfides.[1]: 1851
In inorganic chemistry, when the group −S(=O)2− is not connected to any carbon atoms, it is referred to as sulfuryl.[3]
Examples of sulfonyl group substituents
The names of sulfonyl groups typically end in -syl, such as:[1]: 497
Group name Full name Pseudoelement symbol Example Tosyl p-toluenesulfonyl Ts Tosyl chloride (p-toluenesulfonyl chloride)
CH3C6H4SO2ClBrosyl p-bromobenzenesulfonyl Bs Nosyl o- or p-nitrobenzenesulfonyl Ns Mesyl methanesulfonyl Ms Mesyl chloride (methanesulfonyl chloride)
CH3SO2ClTriflyl trifluoromethanesulfonyl Tf Tresyl 2,2,2-trifluoroethyl-1-sulfonyl Dansyl 5-(dimethylamino)naphthalene-1-sulfonyl Ds Dansyl chloride