Circular dichroism of some optically active steroidal iodides

A series of steroid iodides show the expected absorption maximum at 260–270 nm in their u.v. spectra, and a corresponding maximum in their circular dichroism curves at slightly shorter wavelengths, the sign of which for the secondary iodides usually agrees with that recently reported for alkyl iodides. However, adjacent hetero-substituents or unsaturation may reverse the sign.