Jf. King et al., THE CONFORMATION OF THE CYCLOPROPYLSULFONYL GROUP, Phosphorus, sulfur and silicon and the related elements, 74(1-4), 1993, pp. 445-446
Single crystal x-ray structures of five cyclopropylsulfonyl compounds
all show similar conformations about the (cyclopropyl carbon)-sulfur b
ond (as in 3) consistent with cyclopropyl-sulfonyl conjugation.