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Steroids have been prepared which bear a dimethylphenylsiloxy @PS) group and additional ketone or olefin functionalities. The DPS group has been used to harvest photons in order to direct the excitation energy to the remote target acceptor groups. Examples of intramolecular singlet- singlet and triplet-triplet energy transfer are described, with the DPS group placed at C3, C6 or C17. An earlier example of the role of an 1 1-keto group in acting as a "singlet/triplet switch'' has been extended to activation of an ethylidene group at C17.

Photochemical activation of distal chromophores by antenna substituents in polyfunctional molecules