Isobornanyl sulfoxides and isobornanyl sulfone: Physicochemical characteristics and the features of crystal structure

•Found the absence of reproducibility of the dimeric β-hydroxysulfoxide synthon in the series of sulfur-containing derivatives of bornane.•According to the X-ray data, the supramolecular open-chain S=O⋅⋅⋅H–O synthon is built up in the crystals of diastereomeric sulfoxides.•The isobornanyl sulfone crystal is formed in a complex way – two crystallographically independent molecules playing different roles in the formation of H-bonds.•Based on thermochemical data, the form of the phase diagram of the system was reconstructed, showing that diastereomers have significantly different melting points.