A Search for Interstellar Molecular Lines in the Frequency Range 8·6 to 9·2 GHz

Abstract
An unsuccessful search has been made in the directions of Sagittarius B2, Sagittarius A, and Orion A for molecular lines of formyl, pyridine, formaldehyde, acrolein, and formamide in the frequency range 8�6 to 9�2 GHz. The failure to detect the formyl line in particular provides evidence about the possible modes of formation of interstellar formaldehyde.